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Cell and gene research raise hopes for recessive dystrophic EB treatments
LONDON – .
“I think there is a palpable sense that we are close to some breakthroughs for EB,” which may include “a cure for this intractable disease,” said Jouni Uitto, MD, PhD, in welcoming delegates to the meeting, held in January 2020.
Dr. Uitto, professor of dermatology and cutaneous biology, and biochemistry and molecular biology, at Sidney Kimmel Medical College, Philadelphia, said that the “breadth of academia-based basic science has been tremendous over the past 3 decades. We can now identify 21 different genes harboring mutations associated with different EB phenotypes, and we have a pretty good understanding how those mutations actually explain the phenotypic spectrum of different forms of EB.”
Importantly, “there are now perhaps as many as a dozen different clinical trials that are in the early stages of trying to find a permanent cure for this disease,” Dr. Uitto said, with some that are looking at fixing the underlying defect once and for all, or at the very least, counteracting subsequent complications. “The spectrum varies from attempting to enhance wound healing to gene repair, gene replacement, protein replacement therapies, cell-based therapies. There is a whole spectrum of often complementary approaches that we believe will lead to a cure and treatment for this disease. We look forward to developing therapies which will be helpful to the benefit of all the patients with EB,” said Dr. Uitto, who is also chair of the department of dermatology and cutaneous biology at Sidney Kimmel Medical College.
EB research is gathering ‘momentum’
John McGrath, MD, professor of molecular dermatology, King’s College, London, chaired a session on the latest in cell manipulation research and made the following comment: “A few years ago, we were making progress, but we were chatting about a lot of the same things; but now, suddenly there seems to be momentum, re-energy, rediscovery, real progress.”
Dr. McGrath noted that gene and cell research, and preclinical development, were culminating in clinical trials and potentially products that could change the way clinicians thought about managing patients with EB. “That prospect of getting closer and closer to real treatments, and maybe even a cure” is becoming more of a reality, he said.
Dr. McGrath is also head of the genetic skin disease group at King’s College London, and an honorary consultant dermatologist at St. John’s Institute of Dermatology, part of the Guy’s and St. Thomas’ NHS Foundation Trust in London. He has been a principal investigator for clinical trials of fibroblast cell therapy and allogeneic intravenous mesenchymal stromal cells (MSCs) therapy.
“It has been a joy for me to see the benefits of those clinical trials. There is nothing like it as an investigator when you see an intervention make a difference to a patient,” Dr. McGrath said. “For me, it was just a real eye opener when I saw the skin changes in a child that received intravenous allogeneic MSCs. The skin changed dramatically, it went from red and inflamed to calm and pink, [giving a] first glimpse into something that might be reversible, treatable, not just papering over the cracks.”
Correcting the genetic defect
The most severe form of RDEB is caused by mutations in COL7A1, the gene for collagen type 7 (COL7), the major connective component of the skin, anchoring the epidermis to the dermis. Its absence results in skin that can be so fragile it has been likened to the wings of a butterfly and results in severe blistering after very little trauma.
There is a lot of research on how to correct the underlying genetic defect, either by replacing COL7A1 entirely, repairing the gene, or editing the gene so that COL 7 can be produced in situ and prevent the formation of wounds and heal those that might already be present.
“The excitement is obvious,” said Jakub Tolar, MD, PhD, professor in the department of pediatrics, blood and marrow transplantation, and dean of the University of Minnesota Medical School, Minneapolis, who chaired a session on gene and gene manipulation therapies. “If one can go and correct that information, it follows that everything else is going to be okay,” he said. “Only it’s not. I think that it’s pretty clear that more than gene correction is needed.”
Some of the approaches to replace the faulty gene discussed at the meeting involved taking skin biopsy samples from a healthy area of skin from a patient with RDEB, isolating specific skin cells (fibroblasts, keratinocytes, or both), transferring a healthy copy of the COL7A1 gene into those cells – then expanding the population to form sheets of cells that can be grafted onto the wounds of the same patient.
Clinical trials of gene therapy for RDEB
Clinical trials with these novel gene-corrected, tissue-engineered grafts have already started, including EBGraft, a phase 1/2 open, nonrandomized, proof-of-concept trial using genetically corrected sheets of fibroblasts and keratinocytes, conducted by Alain Hovnanian, MD, PhD, Necker-Enfants Malades Hospital in Paris, and associates.
Then there is the phase 3 VIITAL trial being conducted at Stanford (Calif.) University by Jean Tang, MD, PhD, and colleagues. Recruitment in this open trial, which will enroll 10-15 patients with RDEB, has just started. The aim of the study is to investigate the efficacy and safety of EB-101, an autologous cell therapy that corrects COL7A1 in keratinocytes.
Positive findings from a phase 1/2 study with EB-101 were presented in a poster at the meeting by Emily Gorell, DO, a postdoctoral medical fellow in dermatology, at Stanford University and her associates. The trial included seven patients with RDEB who were treated and followed for 3 to 6 years. Data from that study showed that there were no serious adverse events and 95% of patients’ wounds that were treated (36/38) were healed by at least 50%, based on an Investigator Global Assessment at 6 months. In comparison, none of the untreated wounds had healed by that time point. “There was evidence of C7 [collagen 7] restoration at 2 years in two participants,” and wound healing was associated with both reduced pain and itch, the investigators wrote in the poster.
Another approach to this so-called ‘ex-vivo’ gene therapy is to take the patient’s cells via a small skin biopsy, genetically modify them, expand the population of these modified cells, and then inject them back into the patient. This approach was described by Peter Marinkovich, MD, of the department of dermatology at Stanford University, during an oral presentation and in a poster at the meeting.
Dr. Marinkovich discussed the results of an ongoing phase 1/2 study in which six subjects with RDEB – five adults and one child – were treated intradermally with genetically modified fibroblasts in a preparation currently known as FCX-007.
“Before we had to graft the cells, take the patients into the OR [operating room], with the risks of general anesthesia, but here we don’t have to take the patients to the OR, we just take them into the hospital for a day, inject their wounds and then send them on their way,” Dr. Marinkovich said. Interim findings show that the patients have tolerated the therapy very well up to 52 weeks, he noted.
A greater percentage of wounds were healed by more than 50% following treatment with FCX-007 than those left untreated at weeks 4 (80% versus 20%), 12 (90% versus 44%), 25 (75% versus 50%), and 52 (83% versus 33%).
These results have been used to inform the design of the upcoming phase 3 study, DEFI-RDEB. The multicenter intrapatient randomized, controlled, open-label study is evaluating FCX-007 in the treatment of persistent nonhealing wounds in about 20 people with RDEB.
The promise of ‘off-the-shelf’ topical gene therapy
Another study Dr. Marinkovich is involved with is a phase 1/2 study of beremagene geperpavec (B-VEC), an “in-vivo” gene therapy. B-VEC is a topically administered therapy containing a replication-deficient, nonintegrating viral vector that contains two functional COL7A1 genes. The concept is that, when applied directly onto the skin, the virus gets into the skin and carries with it the healthy gene copies; these get taken up by the skin cells, which then produce COL7.
Initially, two patients with generalized severe RDEB were studied. B-VEC was applied to one of two wounds and a placebo to the other wound in each patient. Another four patients were then enrolled and studied for 3 months. Nine of 10 wounds closed completely after initial administration of B-VEC, with an average time to 100% wound closure of 17.4 days. The average duration of wound closure has been 113 days so far.
“One chronic wound that was originally open for over 4 years closed completely following B-VEC readministration. The wound has remained closed for 100 days,” Dr. Marinkovich and associates reported in a poster at the meeting. A postimaging study showed that COL7 was being produced from 48 hours to up to 90 days later.
“I’m really excited about this type of therapy,” Dr. Marinkovich said during an oral presentation. Unlike the ex-vivo gene therapy approach, where each patient’s cells have to be taken by a biopsy, altered, engineered, and expanded, which takes specialized facilities that can vary by country and location, this in-vivo gene therapy can be considered an “off-the shelf” treatment that can be shipped all over the world and could reach many patients. “It’s another weapon in our armamentarium against this deadly disease that we are all fighting against together,” Dr. Marinkovich added.
EBGRAFT is supported by Cure EB. The VIITAL trial is sponsored by Abeona Therapeutics. The phase 1/2 trials of EB-101 were funded by grants from the National Institutes of Health, EB Research Partnership, EM Medical Research Foundation, and Abeona Therapeutics. The FCX-007 phase 1/2 study was supported by Fibrocell Technologies. The upcoming phase 3 will be funded by Fibrocell Technologies in collaboration with Castle Creek Pharmaceuticals. The B-VEC study is supported by Krystal Biotech.
Dr. Uitto and Dr. McGrath had no potential conflicts of interest to report. Dr. Tolar has received funding from the National Institutes of Health, various EB charities and the Richard M. Schulze Family Foundation (RMSFF). He disclosed receiving honoraria or consultation fees from Ticeba/RHEACELL GmbH and Taiga Biosciences. Dr. Marinkovich disclosed being an investigator working on RDEB-related research projects in collaboration with Krystal Biotech, Fibrocell Technologies, Abeona Therapeutics, and Wings (formerly ProQR).
SOURCES: Gorell E et al. EB 2020, Poster 124; Marinkovich MP et al. EB 2020, Poster 123; Marinkovich MP et al. EB 2020, Poster 52.
LONDON – .
“I think there is a palpable sense that we are close to some breakthroughs for EB,” which may include “a cure for this intractable disease,” said Jouni Uitto, MD, PhD, in welcoming delegates to the meeting, held in January 2020.
Dr. Uitto, professor of dermatology and cutaneous biology, and biochemistry and molecular biology, at Sidney Kimmel Medical College, Philadelphia, said that the “breadth of academia-based basic science has been tremendous over the past 3 decades. We can now identify 21 different genes harboring mutations associated with different EB phenotypes, and we have a pretty good understanding how those mutations actually explain the phenotypic spectrum of different forms of EB.”
Importantly, “there are now perhaps as many as a dozen different clinical trials that are in the early stages of trying to find a permanent cure for this disease,” Dr. Uitto said, with some that are looking at fixing the underlying defect once and for all, or at the very least, counteracting subsequent complications. “The spectrum varies from attempting to enhance wound healing to gene repair, gene replacement, protein replacement therapies, cell-based therapies. There is a whole spectrum of often complementary approaches that we believe will lead to a cure and treatment for this disease. We look forward to developing therapies which will be helpful to the benefit of all the patients with EB,” said Dr. Uitto, who is also chair of the department of dermatology and cutaneous biology at Sidney Kimmel Medical College.
EB research is gathering ‘momentum’
John McGrath, MD, professor of molecular dermatology, King’s College, London, chaired a session on the latest in cell manipulation research and made the following comment: “A few years ago, we were making progress, but we were chatting about a lot of the same things; but now, suddenly there seems to be momentum, re-energy, rediscovery, real progress.”
Dr. McGrath noted that gene and cell research, and preclinical development, were culminating in clinical trials and potentially products that could change the way clinicians thought about managing patients with EB. “That prospect of getting closer and closer to real treatments, and maybe even a cure” is becoming more of a reality, he said.
Dr. McGrath is also head of the genetic skin disease group at King’s College London, and an honorary consultant dermatologist at St. John’s Institute of Dermatology, part of the Guy’s and St. Thomas’ NHS Foundation Trust in London. He has been a principal investigator for clinical trials of fibroblast cell therapy and allogeneic intravenous mesenchymal stromal cells (MSCs) therapy.
“It has been a joy for me to see the benefits of those clinical trials. There is nothing like it as an investigator when you see an intervention make a difference to a patient,” Dr. McGrath said. “For me, it was just a real eye opener when I saw the skin changes in a child that received intravenous allogeneic MSCs. The skin changed dramatically, it went from red and inflamed to calm and pink, [giving a] first glimpse into something that might be reversible, treatable, not just papering over the cracks.”
Correcting the genetic defect
The most severe form of RDEB is caused by mutations in COL7A1, the gene for collagen type 7 (COL7), the major connective component of the skin, anchoring the epidermis to the dermis. Its absence results in skin that can be so fragile it has been likened to the wings of a butterfly and results in severe blistering after very little trauma.
There is a lot of research on how to correct the underlying genetic defect, either by replacing COL7A1 entirely, repairing the gene, or editing the gene so that COL 7 can be produced in situ and prevent the formation of wounds and heal those that might already be present.
“The excitement is obvious,” said Jakub Tolar, MD, PhD, professor in the department of pediatrics, blood and marrow transplantation, and dean of the University of Minnesota Medical School, Minneapolis, who chaired a session on gene and gene manipulation therapies. “If one can go and correct that information, it follows that everything else is going to be okay,” he said. “Only it’s not. I think that it’s pretty clear that more than gene correction is needed.”
Some of the approaches to replace the faulty gene discussed at the meeting involved taking skin biopsy samples from a healthy area of skin from a patient with RDEB, isolating specific skin cells (fibroblasts, keratinocytes, or both), transferring a healthy copy of the COL7A1 gene into those cells – then expanding the population to form sheets of cells that can be grafted onto the wounds of the same patient.
Clinical trials of gene therapy for RDEB
Clinical trials with these novel gene-corrected, tissue-engineered grafts have already started, including EBGraft, a phase 1/2 open, nonrandomized, proof-of-concept trial using genetically corrected sheets of fibroblasts and keratinocytes, conducted by Alain Hovnanian, MD, PhD, Necker-Enfants Malades Hospital in Paris, and associates.
Then there is the phase 3 VIITAL trial being conducted at Stanford (Calif.) University by Jean Tang, MD, PhD, and colleagues. Recruitment in this open trial, which will enroll 10-15 patients with RDEB, has just started. The aim of the study is to investigate the efficacy and safety of EB-101, an autologous cell therapy that corrects COL7A1 in keratinocytes.
Positive findings from a phase 1/2 study with EB-101 were presented in a poster at the meeting by Emily Gorell, DO, a postdoctoral medical fellow in dermatology, at Stanford University and her associates. The trial included seven patients with RDEB who were treated and followed for 3 to 6 years. Data from that study showed that there were no serious adverse events and 95% of patients’ wounds that were treated (36/38) were healed by at least 50%, based on an Investigator Global Assessment at 6 months. In comparison, none of the untreated wounds had healed by that time point. “There was evidence of C7 [collagen 7] restoration at 2 years in two participants,” and wound healing was associated with both reduced pain and itch, the investigators wrote in the poster.
Another approach to this so-called ‘ex-vivo’ gene therapy is to take the patient’s cells via a small skin biopsy, genetically modify them, expand the population of these modified cells, and then inject them back into the patient. This approach was described by Peter Marinkovich, MD, of the department of dermatology at Stanford University, during an oral presentation and in a poster at the meeting.
Dr. Marinkovich discussed the results of an ongoing phase 1/2 study in which six subjects with RDEB – five adults and one child – were treated intradermally with genetically modified fibroblasts in a preparation currently known as FCX-007.
“Before we had to graft the cells, take the patients into the OR [operating room], with the risks of general anesthesia, but here we don’t have to take the patients to the OR, we just take them into the hospital for a day, inject their wounds and then send them on their way,” Dr. Marinkovich said. Interim findings show that the patients have tolerated the therapy very well up to 52 weeks, he noted.
A greater percentage of wounds were healed by more than 50% following treatment with FCX-007 than those left untreated at weeks 4 (80% versus 20%), 12 (90% versus 44%), 25 (75% versus 50%), and 52 (83% versus 33%).
These results have been used to inform the design of the upcoming phase 3 study, DEFI-RDEB. The multicenter intrapatient randomized, controlled, open-label study is evaluating FCX-007 in the treatment of persistent nonhealing wounds in about 20 people with RDEB.
The promise of ‘off-the-shelf’ topical gene therapy
Another study Dr. Marinkovich is involved with is a phase 1/2 study of beremagene geperpavec (B-VEC), an “in-vivo” gene therapy. B-VEC is a topically administered therapy containing a replication-deficient, nonintegrating viral vector that contains two functional COL7A1 genes. The concept is that, when applied directly onto the skin, the virus gets into the skin and carries with it the healthy gene copies; these get taken up by the skin cells, which then produce COL7.
Initially, two patients with generalized severe RDEB were studied. B-VEC was applied to one of two wounds and a placebo to the other wound in each patient. Another four patients were then enrolled and studied for 3 months. Nine of 10 wounds closed completely after initial administration of B-VEC, with an average time to 100% wound closure of 17.4 days. The average duration of wound closure has been 113 days so far.
“One chronic wound that was originally open for over 4 years closed completely following B-VEC readministration. The wound has remained closed for 100 days,” Dr. Marinkovich and associates reported in a poster at the meeting. A postimaging study showed that COL7 was being produced from 48 hours to up to 90 days later.
“I’m really excited about this type of therapy,” Dr. Marinkovich said during an oral presentation. Unlike the ex-vivo gene therapy approach, where each patient’s cells have to be taken by a biopsy, altered, engineered, and expanded, which takes specialized facilities that can vary by country and location, this in-vivo gene therapy can be considered an “off-the shelf” treatment that can be shipped all over the world and could reach many patients. “It’s another weapon in our armamentarium against this deadly disease that we are all fighting against together,” Dr. Marinkovich added.
EBGRAFT is supported by Cure EB. The VIITAL trial is sponsored by Abeona Therapeutics. The phase 1/2 trials of EB-101 were funded by grants from the National Institutes of Health, EB Research Partnership, EM Medical Research Foundation, and Abeona Therapeutics. The FCX-007 phase 1/2 study was supported by Fibrocell Technologies. The upcoming phase 3 will be funded by Fibrocell Technologies in collaboration with Castle Creek Pharmaceuticals. The B-VEC study is supported by Krystal Biotech.
Dr. Uitto and Dr. McGrath had no potential conflicts of interest to report. Dr. Tolar has received funding from the National Institutes of Health, various EB charities and the Richard M. Schulze Family Foundation (RMSFF). He disclosed receiving honoraria or consultation fees from Ticeba/RHEACELL GmbH and Taiga Biosciences. Dr. Marinkovich disclosed being an investigator working on RDEB-related research projects in collaboration with Krystal Biotech, Fibrocell Technologies, Abeona Therapeutics, and Wings (formerly ProQR).
SOURCES: Gorell E et al. EB 2020, Poster 124; Marinkovich MP et al. EB 2020, Poster 123; Marinkovich MP et al. EB 2020, Poster 52.
LONDON – .
“I think there is a palpable sense that we are close to some breakthroughs for EB,” which may include “a cure for this intractable disease,” said Jouni Uitto, MD, PhD, in welcoming delegates to the meeting, held in January 2020.
Dr. Uitto, professor of dermatology and cutaneous biology, and biochemistry and molecular biology, at Sidney Kimmel Medical College, Philadelphia, said that the “breadth of academia-based basic science has been tremendous over the past 3 decades. We can now identify 21 different genes harboring mutations associated with different EB phenotypes, and we have a pretty good understanding how those mutations actually explain the phenotypic spectrum of different forms of EB.”
Importantly, “there are now perhaps as many as a dozen different clinical trials that are in the early stages of trying to find a permanent cure for this disease,” Dr. Uitto said, with some that are looking at fixing the underlying defect once and for all, or at the very least, counteracting subsequent complications. “The spectrum varies from attempting to enhance wound healing to gene repair, gene replacement, protein replacement therapies, cell-based therapies. There is a whole spectrum of often complementary approaches that we believe will lead to a cure and treatment for this disease. We look forward to developing therapies which will be helpful to the benefit of all the patients with EB,” said Dr. Uitto, who is also chair of the department of dermatology and cutaneous biology at Sidney Kimmel Medical College.
EB research is gathering ‘momentum’
John McGrath, MD, professor of molecular dermatology, King’s College, London, chaired a session on the latest in cell manipulation research and made the following comment: “A few years ago, we were making progress, but we were chatting about a lot of the same things; but now, suddenly there seems to be momentum, re-energy, rediscovery, real progress.”
Dr. McGrath noted that gene and cell research, and preclinical development, were culminating in clinical trials and potentially products that could change the way clinicians thought about managing patients with EB. “That prospect of getting closer and closer to real treatments, and maybe even a cure” is becoming more of a reality, he said.
Dr. McGrath is also head of the genetic skin disease group at King’s College London, and an honorary consultant dermatologist at St. John’s Institute of Dermatology, part of the Guy’s and St. Thomas’ NHS Foundation Trust in London. He has been a principal investigator for clinical trials of fibroblast cell therapy and allogeneic intravenous mesenchymal stromal cells (MSCs) therapy.
“It has been a joy for me to see the benefits of those clinical trials. There is nothing like it as an investigator when you see an intervention make a difference to a patient,” Dr. McGrath said. “For me, it was just a real eye opener when I saw the skin changes in a child that received intravenous allogeneic MSCs. The skin changed dramatically, it went from red and inflamed to calm and pink, [giving a] first glimpse into something that might be reversible, treatable, not just papering over the cracks.”
Correcting the genetic defect
The most severe form of RDEB is caused by mutations in COL7A1, the gene for collagen type 7 (COL7), the major connective component of the skin, anchoring the epidermis to the dermis. Its absence results in skin that can be so fragile it has been likened to the wings of a butterfly and results in severe blistering after very little trauma.
There is a lot of research on how to correct the underlying genetic defect, either by replacing COL7A1 entirely, repairing the gene, or editing the gene so that COL 7 can be produced in situ and prevent the formation of wounds and heal those that might already be present.
“The excitement is obvious,” said Jakub Tolar, MD, PhD, professor in the department of pediatrics, blood and marrow transplantation, and dean of the University of Minnesota Medical School, Minneapolis, who chaired a session on gene and gene manipulation therapies. “If one can go and correct that information, it follows that everything else is going to be okay,” he said. “Only it’s not. I think that it’s pretty clear that more than gene correction is needed.”
Some of the approaches to replace the faulty gene discussed at the meeting involved taking skin biopsy samples from a healthy area of skin from a patient with RDEB, isolating specific skin cells (fibroblasts, keratinocytes, or both), transferring a healthy copy of the COL7A1 gene into those cells – then expanding the population to form sheets of cells that can be grafted onto the wounds of the same patient.
Clinical trials of gene therapy for RDEB
Clinical trials with these novel gene-corrected, tissue-engineered grafts have already started, including EBGraft, a phase 1/2 open, nonrandomized, proof-of-concept trial using genetically corrected sheets of fibroblasts and keratinocytes, conducted by Alain Hovnanian, MD, PhD, Necker-Enfants Malades Hospital in Paris, and associates.
Then there is the phase 3 VIITAL trial being conducted at Stanford (Calif.) University by Jean Tang, MD, PhD, and colleagues. Recruitment in this open trial, which will enroll 10-15 patients with RDEB, has just started. The aim of the study is to investigate the efficacy and safety of EB-101, an autologous cell therapy that corrects COL7A1 in keratinocytes.
Positive findings from a phase 1/2 study with EB-101 were presented in a poster at the meeting by Emily Gorell, DO, a postdoctoral medical fellow in dermatology, at Stanford University and her associates. The trial included seven patients with RDEB who were treated and followed for 3 to 6 years. Data from that study showed that there were no serious adverse events and 95% of patients’ wounds that were treated (36/38) were healed by at least 50%, based on an Investigator Global Assessment at 6 months. In comparison, none of the untreated wounds had healed by that time point. “There was evidence of C7 [collagen 7] restoration at 2 years in two participants,” and wound healing was associated with both reduced pain and itch, the investigators wrote in the poster.
Another approach to this so-called ‘ex-vivo’ gene therapy is to take the patient’s cells via a small skin biopsy, genetically modify them, expand the population of these modified cells, and then inject them back into the patient. This approach was described by Peter Marinkovich, MD, of the department of dermatology at Stanford University, during an oral presentation and in a poster at the meeting.
Dr. Marinkovich discussed the results of an ongoing phase 1/2 study in which six subjects with RDEB – five adults and one child – were treated intradermally with genetically modified fibroblasts in a preparation currently known as FCX-007.
“Before we had to graft the cells, take the patients into the OR [operating room], with the risks of general anesthesia, but here we don’t have to take the patients to the OR, we just take them into the hospital for a day, inject their wounds and then send them on their way,” Dr. Marinkovich said. Interim findings show that the patients have tolerated the therapy very well up to 52 weeks, he noted.
A greater percentage of wounds were healed by more than 50% following treatment with FCX-007 than those left untreated at weeks 4 (80% versus 20%), 12 (90% versus 44%), 25 (75% versus 50%), and 52 (83% versus 33%).
These results have been used to inform the design of the upcoming phase 3 study, DEFI-RDEB. The multicenter intrapatient randomized, controlled, open-label study is evaluating FCX-007 in the treatment of persistent nonhealing wounds in about 20 people with RDEB.
The promise of ‘off-the-shelf’ topical gene therapy
Another study Dr. Marinkovich is involved with is a phase 1/2 study of beremagene geperpavec (B-VEC), an “in-vivo” gene therapy. B-VEC is a topically administered therapy containing a replication-deficient, nonintegrating viral vector that contains two functional COL7A1 genes. The concept is that, when applied directly onto the skin, the virus gets into the skin and carries with it the healthy gene copies; these get taken up by the skin cells, which then produce COL7.
Initially, two patients with generalized severe RDEB were studied. B-VEC was applied to one of two wounds and a placebo to the other wound in each patient. Another four patients were then enrolled and studied for 3 months. Nine of 10 wounds closed completely after initial administration of B-VEC, with an average time to 100% wound closure of 17.4 days. The average duration of wound closure has been 113 days so far.
“One chronic wound that was originally open for over 4 years closed completely following B-VEC readministration. The wound has remained closed for 100 days,” Dr. Marinkovich and associates reported in a poster at the meeting. A postimaging study showed that COL7 was being produced from 48 hours to up to 90 days later.
“I’m really excited about this type of therapy,” Dr. Marinkovich said during an oral presentation. Unlike the ex-vivo gene therapy approach, where each patient’s cells have to be taken by a biopsy, altered, engineered, and expanded, which takes specialized facilities that can vary by country and location, this in-vivo gene therapy can be considered an “off-the shelf” treatment that can be shipped all over the world and could reach many patients. “It’s another weapon in our armamentarium against this deadly disease that we are all fighting against together,” Dr. Marinkovich added.
EBGRAFT is supported by Cure EB. The VIITAL trial is sponsored by Abeona Therapeutics. The phase 1/2 trials of EB-101 were funded by grants from the National Institutes of Health, EB Research Partnership, EM Medical Research Foundation, and Abeona Therapeutics. The FCX-007 phase 1/2 study was supported by Fibrocell Technologies. The upcoming phase 3 will be funded by Fibrocell Technologies in collaboration with Castle Creek Pharmaceuticals. The B-VEC study is supported by Krystal Biotech.
Dr. Uitto and Dr. McGrath had no potential conflicts of interest to report. Dr. Tolar has received funding from the National Institutes of Health, various EB charities and the Richard M. Schulze Family Foundation (RMSFF). He disclosed receiving honoraria or consultation fees from Ticeba/RHEACELL GmbH and Taiga Biosciences. Dr. Marinkovich disclosed being an investigator working on RDEB-related research projects in collaboration with Krystal Biotech, Fibrocell Technologies, Abeona Therapeutics, and Wings (formerly ProQR).
SOURCES: Gorell E et al. EB 2020, Poster 124; Marinkovich MP et al. EB 2020, Poster 123; Marinkovich MP et al. EB 2020, Poster 52.
REPORTING FROM EB 2020
Cell therapy closes large wounds in epidermolysis bullosa
LONDON –
Of 85 patients with the recessive dystrophic type of EB (RDEB) who were surveyed through the EBCare Registry, 39 had available data from the validated quality of life in EB (QOLEB) questionnaire. Those with the largest wounds (7.5 cm or greater) had an average QOLEB score of 27, compared with 22.5 for those with wounds ranging from 2.5 to 7.5 cm in size, and a score of 14 for those with wounds less than 2.5 cm in size. The maximum score on the 17-item questionnaire is 51, with the higher the number, the greater the impact on quality of life.
“Large wound areas were seen more frequently in chronic open wounds, similar to findings in separate studies,” Emily S. Gorell, DO, a postdoctoral clinical research fellow in dermatology at Stanford (Calif.) University, and associates reported in a poster presentation at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association.
“Larger wounds correlate with self-reported disease severity and key clinical manifestations,” they said, which includes history of squamous cell carcinoma (P = .04), anemia (P less than.01), osteoporosis (P = .03), and gastrostomy tube use (P = .02).
In total, 28 adults and 37 children and adolescents were surveyed; the majority (59%) were from North America, with the remainder from Europe (26%) or other countries (15%). Just over half of respondents were female (53%), and about 38% of surveys were completed by the individual rather than a parent or care giver (62%).
Dr. Gorell is working with Jean Y. Tang, MD, PhD, professor of dermatology at Stanford. During an oral presentation at the meeting, Dr. Tang observed that wounds could be defined as being recurrent or chronic open wounds. These two types of wounds behave differently, she said, with the latter never fully healing.
Indeed, in the survey, data on 1,226 wounds were collated, with 937 (76%) classified as recurrent – and healing within 12 weeks – but 289 (24%) remaining chronic open wounds, which did not heal for 12 weeks or longer. Some patients have had open wounds for more than 6 years, Dr. Tang noted.
“In our natural history study … you can see that chronic open wounds never reached 100% closure, they hardly ever reached 50% closure,” she said. In contrast, recurrent wounds have a more dynamic nature, healing completely, then reopening time after time. This is important when considering suitable endpoints for clinical trials, she said, as it could make or break some of the novel treatment approaches currently being tested. For instance, the placebo response in phase 3 trials of the topical therapy allantoin might have been high because recurrent wounds were being studied and were more likely to heal with or without active treatment.
“We’ve done a lot of work, it’s been 2 years, and we have benefited tremendously from these data in our negotiations with the FDA [Food and Drug Administration],” Dr. Tang said. “I am glad we did our homework … we were able to convince the FDA that, for a chronic open wound, a meaningful outcome is 50% healing, not 100%.”
Dr. Tang and Dr. Gorell are part of a team looking at gene-corrected autologous cell therapy (EB-101) to help heal large wounds caused by RDEB. The premise is that by replacing the faulty COL7A1 gene in keratinocytes taken from an individual, these skin cells will be able to produce collagen type VII (COL7). After being grown in culture to form epidermal sheets that look like a plastic film, the sheets can then be grafted over an individuals’ wounds.
Dr. Tang noted that the work was the culmination of 17 years’ of hard work by a small group of committed scientists. Preclinical studies started in 2003, when, she said, “the only funding we could get was through the NIH and thankfully some of the patient organizations.”
Initial results with the EB-101 therapy have been promising. Data on the first four subjects included in a seven-patient phase 1/2 study were published 4 years ago (JAMA. 2016;316[17]:1808-17), and the complete data were recently released (JCI Insight. 2019;4. doi: 10.1172/jci.insight.130554). Each trial subject had an EB-101 graft of approximately 35 cm2 (5 cm x 7 cm) transplanted onto three wounds, with three similar wounds used as controls.
At 6 months, 95% of treated wounds had healed by 50% or more, compared with none of the untreated control wounds (P less than .0001). Healing rates at 1 year and 2 years, respectively, were 68% vs. 17% (P = .025) and 71% vs. 17% (P = .019). All grafts were well tolerated and molecular correction was seen to last for up to 2 years in two patients.
EB-101 therapy will be evaluated in a phase 3 study, the VIITAL study, a multicenter, randomized trial involving 10-15 individuals with RDEB; 50% wound healing at 3 months is the trial’s primary endpoint. The trial, funded by Abeona Therapeutics, was given the go ahead by the FDA in December 2019 and has an estimated completion date of March 2021.
Dr. Gorell did not provide a conflict of interest statement. Dr. Tang disclosed receipt of honoraria or consultation fees from Abeona and Menlo Therapeutics and being a stock shareholder in PellePharm and BridgeBio. Dr. Tang also acknowledged receiving research grants from the EB Research Partnership, the Epidermolysis Medical Research Foundation, and the California Institute for Regenerative Medicine.
SOURCES: Gorell ES et al. EB World Congress, poster 29. Tang JYl. EB World Congress, oral presentation.
LONDON –
Of 85 patients with the recessive dystrophic type of EB (RDEB) who were surveyed through the EBCare Registry, 39 had available data from the validated quality of life in EB (QOLEB) questionnaire. Those with the largest wounds (7.5 cm or greater) had an average QOLEB score of 27, compared with 22.5 for those with wounds ranging from 2.5 to 7.5 cm in size, and a score of 14 for those with wounds less than 2.5 cm in size. The maximum score on the 17-item questionnaire is 51, with the higher the number, the greater the impact on quality of life.
“Large wound areas were seen more frequently in chronic open wounds, similar to findings in separate studies,” Emily S. Gorell, DO, a postdoctoral clinical research fellow in dermatology at Stanford (Calif.) University, and associates reported in a poster presentation at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association.
“Larger wounds correlate with self-reported disease severity and key clinical manifestations,” they said, which includes history of squamous cell carcinoma (P = .04), anemia (P less than.01), osteoporosis (P = .03), and gastrostomy tube use (P = .02).
In total, 28 adults and 37 children and adolescents were surveyed; the majority (59%) were from North America, with the remainder from Europe (26%) or other countries (15%). Just over half of respondents were female (53%), and about 38% of surveys were completed by the individual rather than a parent or care giver (62%).
Dr. Gorell is working with Jean Y. Tang, MD, PhD, professor of dermatology at Stanford. During an oral presentation at the meeting, Dr. Tang observed that wounds could be defined as being recurrent or chronic open wounds. These two types of wounds behave differently, she said, with the latter never fully healing.
Indeed, in the survey, data on 1,226 wounds were collated, with 937 (76%) classified as recurrent – and healing within 12 weeks – but 289 (24%) remaining chronic open wounds, which did not heal for 12 weeks or longer. Some patients have had open wounds for more than 6 years, Dr. Tang noted.
“In our natural history study … you can see that chronic open wounds never reached 100% closure, they hardly ever reached 50% closure,” she said. In contrast, recurrent wounds have a more dynamic nature, healing completely, then reopening time after time. This is important when considering suitable endpoints for clinical trials, she said, as it could make or break some of the novel treatment approaches currently being tested. For instance, the placebo response in phase 3 trials of the topical therapy allantoin might have been high because recurrent wounds were being studied and were more likely to heal with or without active treatment.
“We’ve done a lot of work, it’s been 2 years, and we have benefited tremendously from these data in our negotiations with the FDA [Food and Drug Administration],” Dr. Tang said. “I am glad we did our homework … we were able to convince the FDA that, for a chronic open wound, a meaningful outcome is 50% healing, not 100%.”
Dr. Tang and Dr. Gorell are part of a team looking at gene-corrected autologous cell therapy (EB-101) to help heal large wounds caused by RDEB. The premise is that by replacing the faulty COL7A1 gene in keratinocytes taken from an individual, these skin cells will be able to produce collagen type VII (COL7). After being grown in culture to form epidermal sheets that look like a plastic film, the sheets can then be grafted over an individuals’ wounds.
Dr. Tang noted that the work was the culmination of 17 years’ of hard work by a small group of committed scientists. Preclinical studies started in 2003, when, she said, “the only funding we could get was through the NIH and thankfully some of the patient organizations.”
Initial results with the EB-101 therapy have been promising. Data on the first four subjects included in a seven-patient phase 1/2 study were published 4 years ago (JAMA. 2016;316[17]:1808-17), and the complete data were recently released (JCI Insight. 2019;4. doi: 10.1172/jci.insight.130554). Each trial subject had an EB-101 graft of approximately 35 cm2 (5 cm x 7 cm) transplanted onto three wounds, with three similar wounds used as controls.
At 6 months, 95% of treated wounds had healed by 50% or more, compared with none of the untreated control wounds (P less than .0001). Healing rates at 1 year and 2 years, respectively, were 68% vs. 17% (P = .025) and 71% vs. 17% (P = .019). All grafts were well tolerated and molecular correction was seen to last for up to 2 years in two patients.
EB-101 therapy will be evaluated in a phase 3 study, the VIITAL study, a multicenter, randomized trial involving 10-15 individuals with RDEB; 50% wound healing at 3 months is the trial’s primary endpoint. The trial, funded by Abeona Therapeutics, was given the go ahead by the FDA in December 2019 and has an estimated completion date of March 2021.
Dr. Gorell did not provide a conflict of interest statement. Dr. Tang disclosed receipt of honoraria or consultation fees from Abeona and Menlo Therapeutics and being a stock shareholder in PellePharm and BridgeBio. Dr. Tang also acknowledged receiving research grants from the EB Research Partnership, the Epidermolysis Medical Research Foundation, and the California Institute for Regenerative Medicine.
SOURCES: Gorell ES et al. EB World Congress, poster 29. Tang JYl. EB World Congress, oral presentation.
LONDON –
Of 85 patients with the recessive dystrophic type of EB (RDEB) who were surveyed through the EBCare Registry, 39 had available data from the validated quality of life in EB (QOLEB) questionnaire. Those with the largest wounds (7.5 cm or greater) had an average QOLEB score of 27, compared with 22.5 for those with wounds ranging from 2.5 to 7.5 cm in size, and a score of 14 for those with wounds less than 2.5 cm in size. The maximum score on the 17-item questionnaire is 51, with the higher the number, the greater the impact on quality of life.
“Large wound areas were seen more frequently in chronic open wounds, similar to findings in separate studies,” Emily S. Gorell, DO, a postdoctoral clinical research fellow in dermatology at Stanford (Calif.) University, and associates reported in a poster presentation at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association.
“Larger wounds correlate with self-reported disease severity and key clinical manifestations,” they said, which includes history of squamous cell carcinoma (P = .04), anemia (P less than.01), osteoporosis (P = .03), and gastrostomy tube use (P = .02).
In total, 28 adults and 37 children and adolescents were surveyed; the majority (59%) were from North America, with the remainder from Europe (26%) or other countries (15%). Just over half of respondents were female (53%), and about 38% of surveys were completed by the individual rather than a parent or care giver (62%).
Dr. Gorell is working with Jean Y. Tang, MD, PhD, professor of dermatology at Stanford. During an oral presentation at the meeting, Dr. Tang observed that wounds could be defined as being recurrent or chronic open wounds. These two types of wounds behave differently, she said, with the latter never fully healing.
Indeed, in the survey, data on 1,226 wounds were collated, with 937 (76%) classified as recurrent – and healing within 12 weeks – but 289 (24%) remaining chronic open wounds, which did not heal for 12 weeks or longer. Some patients have had open wounds for more than 6 years, Dr. Tang noted.
“In our natural history study … you can see that chronic open wounds never reached 100% closure, they hardly ever reached 50% closure,” she said. In contrast, recurrent wounds have a more dynamic nature, healing completely, then reopening time after time. This is important when considering suitable endpoints for clinical trials, she said, as it could make or break some of the novel treatment approaches currently being tested. For instance, the placebo response in phase 3 trials of the topical therapy allantoin might have been high because recurrent wounds were being studied and were more likely to heal with or without active treatment.
“We’ve done a lot of work, it’s been 2 years, and we have benefited tremendously from these data in our negotiations with the FDA [Food and Drug Administration],” Dr. Tang said. “I am glad we did our homework … we were able to convince the FDA that, for a chronic open wound, a meaningful outcome is 50% healing, not 100%.”
Dr. Tang and Dr. Gorell are part of a team looking at gene-corrected autologous cell therapy (EB-101) to help heal large wounds caused by RDEB. The premise is that by replacing the faulty COL7A1 gene in keratinocytes taken from an individual, these skin cells will be able to produce collagen type VII (COL7). After being grown in culture to form epidermal sheets that look like a plastic film, the sheets can then be grafted over an individuals’ wounds.
Dr. Tang noted that the work was the culmination of 17 years’ of hard work by a small group of committed scientists. Preclinical studies started in 2003, when, she said, “the only funding we could get was through the NIH and thankfully some of the patient organizations.”
Initial results with the EB-101 therapy have been promising. Data on the first four subjects included in a seven-patient phase 1/2 study were published 4 years ago (JAMA. 2016;316[17]:1808-17), and the complete data were recently released (JCI Insight. 2019;4. doi: 10.1172/jci.insight.130554). Each trial subject had an EB-101 graft of approximately 35 cm2 (5 cm x 7 cm) transplanted onto three wounds, with three similar wounds used as controls.
At 6 months, 95% of treated wounds had healed by 50% or more, compared with none of the untreated control wounds (P less than .0001). Healing rates at 1 year and 2 years, respectively, were 68% vs. 17% (P = .025) and 71% vs. 17% (P = .019). All grafts were well tolerated and molecular correction was seen to last for up to 2 years in two patients.
EB-101 therapy will be evaluated in a phase 3 study, the VIITAL study, a multicenter, randomized trial involving 10-15 individuals with RDEB; 50% wound healing at 3 months is the trial’s primary endpoint. The trial, funded by Abeona Therapeutics, was given the go ahead by the FDA in December 2019 and has an estimated completion date of March 2021.
Dr. Gorell did not provide a conflict of interest statement. Dr. Tang disclosed receipt of honoraria or consultation fees from Abeona and Menlo Therapeutics and being a stock shareholder in PellePharm and BridgeBio. Dr. Tang also acknowledged receiving research grants from the EB Research Partnership, the Epidermolysis Medical Research Foundation, and the California Institute for Regenerative Medicine.
SOURCES: Gorell ES et al. EB World Congress, poster 29. Tang JYl. EB World Congress, oral presentation.
REPORTING FROM EB WORLD CONGRESS
Testing times for epidermolysis bullosa topical therapies
LONDON –
Results from trials such as ESSENCE, with allantoin, and DELIVERS, with diacerein, were “disappointing,” Dédée Murrell, BMBCh, MD, pointed out at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA).
Those two topical agents were most likely let down by the trials’ design, said Dr. Murrell, of St. George Hospital, University of New South Wales, Sydney, but she noted that there were still some promising trials that were either ongoing, such as EASE, with Oleogel-S10, or that were about to be unblinded, such as SISTERS, with sirolimus.
Epidermolysis bullosa (EB) is a group of rare genetic diseases that can cause the skin to blister and peel away to varying degrees, causing itchy and painful skin, as well as recurrent wounds, some of which may seem never to heal and that increase the risk for squamous cell carcinoma. Although finding a cure for the disease is high on the research agenda, finding a reliable therapy that can soothe and protect the skin is of equal importance.
Trials and tribulations
Conducting trials in rare diseases can be difficult because the studies are often small and poorly controlled, Dr. Murrell said during an oral presentation at the meeting. To gain regulatory approval, trials need to have an active and a placebo arm, because “even though we’re dealing with a rare disease, we still have to show statistical significance between the two arms.”
However, it is not just about finding enough participants who meet the inclusion criteria and adequately controlling the study, as finding funding can also be a significant hurdle. That is the case particularly when an existing drug with no patent protection is proposed to be repurposed. As an example, Dr. Murrell said that many patients with EB may use gentian violet to treat their condition, but it has been around for so long and is so widely used, that funding a trial to formally prove its merit is unlikely. In addition, “there are special caveats that occur in dermatology clinical trials with topical drugs that don’t exist [in trials] with systemic treatments, one of which is that it is very important to keep other variables the same,” Dr. Murrell said. “So, for example, the dressings need to stay the same throughout a trial with a topical therapy, because if you improve the dressings [during the course of the trial], you could mask the effect of the treatment.” Similarly, the bathing and cleansing routines of the participants need to remain the same throughout the trial.
“We also need to have validated instruments to prove whether these treatments are working, and the instruments need to be objective as well as subjective,” Dr. Murrell advised. For example, inflammation and blistering need to be scored separately from scarring and skin damage. “You have to conduct a clinical trial to be able to verify that there is diminished scarring or damage, because those are the longer-term complications.” Inflammation and blistering are valid endpoints to use in shorter-term studies.
Dr. Murrell also cautioned on getting too enthused about the results of case reports. “We do get excited when we see a patient using something new and they seem to be getting much better,” but such reports do not have a placebo arm, or, if there is one, then there is no vehicle control, she said. It’s important to include a run-in period in a trial to establish a new baseline and to ensure that any effects seen with a topical agent are independent of the carrier substance or any altered bathing behavior or dressing habits, which could skew the results.
ESSENCE and allantoin
So what went wrong in the phase 3 ESSENCE trial with allantoin, which was halted early in September 2017? The trial had included 169 patients with any type of EB – simplex, recessive dystrophic, and junctional non-Herlitz – who were randomized to treatment with the allantoin-containing cream SD-101 or a placebo cream containing only the vehicle. The creams were applied daily to the entire body for 3 months, with the primary endpoint being total wound closure at the end of the treatment period. Total wound closure was a requirement of the Food and Drug Administration, Dr. Murrell said, but it is now known that 100% closure is not always likely, which the agency itself now concedes.
“Most disappointingly, no significant difference was found [between the study drug and placebo], therefore it didn’t meet the primary endpoint, and you’re not even allowed to consider secondary endpoints – those are the rules of the game,” she said. As a result, the trial was stopped in 2017.
For inclusion in the study, patients had to have at least one target wound that had been present for at least 3 weeks, but there was no stratification on the duration of wounds in the randomization process. That meant that some individuals with wounds of shorter duration had unintentionally ended up in the placebo arm – favoring healing – and those with more chronic wounds had been in the allantoin arm. So, because the study arms might not have been equally balanced at baseline, it would have been harder for the actual treatment to demonstrate a benefit, Dr. Murrell suggested.
Another problem with the trial was that the vehicle cream contained elements, such as lanolin, already associated with wound healing. That would have given patients in the placebo arm an advantage because anyone applying the cream every day would probably get better or improve to some degree.
The patients were also required to have daily dressing changes and baths and, “if you give any patient that advice and they comply with it for a period of time, they are going to improve,” whether or not they are applying the study drug. Dr. Murrell said that the researchers likely should have done a run-in period first and then established a new baseline to randomize the patients.
“Lastly, no one had ever done a study of what we essentially tell eczema patients to do every day … to moisturize, because that will provide extra protection and barrier to their skin. So, if anything, the ESSENCE study shows that moisturizing has a protective effect of the vehicle for patients with EB,” she said.
DELIVERS and diacerein
Another trial that was stopped prematurely was the phase 2 DELIVERS study, which was set up to assess the benefits of topical diacerein in people with EB simplex. Diacerein, an extract of rhubarb root, was tested in 54 patients, who were randomized to apply either diacerein or vehicle ointment for 8 weeks.
Initially, the results “looked very promising,” Dr. Murrell said, because there was a trend toward improved EB simplex lesions, with the primary endpoint of at least a 60% reduction in lesions met by 57.1% of diacerein-treated and 53.8% of vehicle-treated patients.
However, the trial included use of the Investigator’s Global Assessment Scale at the FDA’s behest, but the tool had not been validated in previous EB trials, and which didn’t seem to show any benefit of the active over the placebo ointment. (The Investigator’s Global Assessment is a 5-point scale used for overall clinical assessment of severity of disease, ranging from 0 to 4, where a higher score denotes worse outcome.)In a poster presented separately at the meeting, the DELIVERS researchers noted that “the lack of statistical significance in the primary endpoint could be explained in part by milder disease in the diacerein group.” The mean body surface area of EB simplex lesions within the assessment area at baseline was 5.76% in the diacerein group and 7.13% in the vehicle group. The researchers proposed that perhaps a higher concentration of diacerein than the 1% used in the trial might have been needed.
Sirolimus and EB simplex
Dr. Murrell noted that a pilot study, known as the SISTERS trial, had been conducted with a 2% sirolimus topical ointment at her institution and at Stanford (Calif.) University. This prospective, double-blind study had involved 16 patients with EB simplex, in which blisters tend to be confined to the palms of the hands and soles of the feet. The patients were assigned to treat both feet with either topical sirolimus or a placebo cream for 12 weeks. After a 4-week wash-out period, the patients switched to using the opposite cream for an additional 12 weeks.
Sirolimus is an inhibitor of the mTOR pathway, and, according to a description of the study on ClinicalTrials.gov, the researchers’ aim was to inhibit “the mTOR pathway to down-regulate the translation of defective keratin proteins.” That would allow a transition from supportive care, which is the current practice for EB simplex, to using a targeted molecular therapy to improve patient mobility and quality of life, they note on the site.
“We look forward to having that study unblinded,” Dr. Murrell said, adding that “data should be ready in a few months.”
EASE and Oleogel-S10
Oleogel-S10 is a gel that contains a birch bark extract dissolved in sunflower oil. It is already approved in Europe (Episalvan) for the treatment of partial-thickness skin wounds, but its use in EB remains investigational.
In a poster presentation at the meeting, Stella Gewert, MD, of the University of Freiburg (Germany) and colleagues discussed their experience using Oleogel-S10 in the treatment of four patients – each with a different type of EB – who applied the gel for between 6 days and 3 months.
Promising effects were seen, including reduced pruritus and pain, wounds healing more quickly, and reductions in lesion size. “During treatment, dressing requirements were reduced, and patient quality of life improved,” the researchers observed.
Mark Sumeray, MD, the chief medical officer of Amryt Pharmaceuticals, which is developing Oleogel-S10, said it was important to emphasize that Oleogel-S10 is a gel and not a cream. Gels are mixed with oil and are easier to apply – an important consideration for those with EB, he explained, whereas creams tend to be mixed with water and are stickier.
The phase 3 EASE trial is looking at the efficacy and safety of the gel in patients with junctional and dystrophic EB, and recruitment is ongoing, Dr. Murrell said. The primary endpoint is the proportion of patients with the first complete closure of a target wound within 45 days of treatment initiation. The estimated primary completion date for the trial is June 2020, and it is projected to end by 2022.
Scioderm, in collaboration with Amicus, funded the ESSENCE trial; Castle Creek financed the DELIVERS study; Amryt is supporting the EASE study; and Stanford University is sponsor of the SISTERS study. Dr. Murrell has been the principal investigator for trials run by Amicus, Amryt, Castle Creek, and Shire, and she acknowledged receipt of honoraria or consultation fees from those companies and others. Dr. Gewert did not report any financial disclosures. Dr. Sumeray is an employee and shareholder of Amryt.
LONDON –
Results from trials such as ESSENCE, with allantoin, and DELIVERS, with diacerein, were “disappointing,” Dédée Murrell, BMBCh, MD, pointed out at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA).
Those two topical agents were most likely let down by the trials’ design, said Dr. Murrell, of St. George Hospital, University of New South Wales, Sydney, but she noted that there were still some promising trials that were either ongoing, such as EASE, with Oleogel-S10, or that were about to be unblinded, such as SISTERS, with sirolimus.
Epidermolysis bullosa (EB) is a group of rare genetic diseases that can cause the skin to blister and peel away to varying degrees, causing itchy and painful skin, as well as recurrent wounds, some of which may seem never to heal and that increase the risk for squamous cell carcinoma. Although finding a cure for the disease is high on the research agenda, finding a reliable therapy that can soothe and protect the skin is of equal importance.
Trials and tribulations
Conducting trials in rare diseases can be difficult because the studies are often small and poorly controlled, Dr. Murrell said during an oral presentation at the meeting. To gain regulatory approval, trials need to have an active and a placebo arm, because “even though we’re dealing with a rare disease, we still have to show statistical significance between the two arms.”
However, it is not just about finding enough participants who meet the inclusion criteria and adequately controlling the study, as finding funding can also be a significant hurdle. That is the case particularly when an existing drug with no patent protection is proposed to be repurposed. As an example, Dr. Murrell said that many patients with EB may use gentian violet to treat their condition, but it has been around for so long and is so widely used, that funding a trial to formally prove its merit is unlikely. In addition, “there are special caveats that occur in dermatology clinical trials with topical drugs that don’t exist [in trials] with systemic treatments, one of which is that it is very important to keep other variables the same,” Dr. Murrell said. “So, for example, the dressings need to stay the same throughout a trial with a topical therapy, because if you improve the dressings [during the course of the trial], you could mask the effect of the treatment.” Similarly, the bathing and cleansing routines of the participants need to remain the same throughout the trial.
“We also need to have validated instruments to prove whether these treatments are working, and the instruments need to be objective as well as subjective,” Dr. Murrell advised. For example, inflammation and blistering need to be scored separately from scarring and skin damage. “You have to conduct a clinical trial to be able to verify that there is diminished scarring or damage, because those are the longer-term complications.” Inflammation and blistering are valid endpoints to use in shorter-term studies.
Dr. Murrell also cautioned on getting too enthused about the results of case reports. “We do get excited when we see a patient using something new and they seem to be getting much better,” but such reports do not have a placebo arm, or, if there is one, then there is no vehicle control, she said. It’s important to include a run-in period in a trial to establish a new baseline and to ensure that any effects seen with a topical agent are independent of the carrier substance or any altered bathing behavior or dressing habits, which could skew the results.
ESSENCE and allantoin
So what went wrong in the phase 3 ESSENCE trial with allantoin, which was halted early in September 2017? The trial had included 169 patients with any type of EB – simplex, recessive dystrophic, and junctional non-Herlitz – who were randomized to treatment with the allantoin-containing cream SD-101 or a placebo cream containing only the vehicle. The creams were applied daily to the entire body for 3 months, with the primary endpoint being total wound closure at the end of the treatment period. Total wound closure was a requirement of the Food and Drug Administration, Dr. Murrell said, but it is now known that 100% closure is not always likely, which the agency itself now concedes.
“Most disappointingly, no significant difference was found [between the study drug and placebo], therefore it didn’t meet the primary endpoint, and you’re not even allowed to consider secondary endpoints – those are the rules of the game,” she said. As a result, the trial was stopped in 2017.
For inclusion in the study, patients had to have at least one target wound that had been present for at least 3 weeks, but there was no stratification on the duration of wounds in the randomization process. That meant that some individuals with wounds of shorter duration had unintentionally ended up in the placebo arm – favoring healing – and those with more chronic wounds had been in the allantoin arm. So, because the study arms might not have been equally balanced at baseline, it would have been harder for the actual treatment to demonstrate a benefit, Dr. Murrell suggested.
Another problem with the trial was that the vehicle cream contained elements, such as lanolin, already associated with wound healing. That would have given patients in the placebo arm an advantage because anyone applying the cream every day would probably get better or improve to some degree.
The patients were also required to have daily dressing changes and baths and, “if you give any patient that advice and they comply with it for a period of time, they are going to improve,” whether or not they are applying the study drug. Dr. Murrell said that the researchers likely should have done a run-in period first and then established a new baseline to randomize the patients.
“Lastly, no one had ever done a study of what we essentially tell eczema patients to do every day … to moisturize, because that will provide extra protection and barrier to their skin. So, if anything, the ESSENCE study shows that moisturizing has a protective effect of the vehicle for patients with EB,” she said.
DELIVERS and diacerein
Another trial that was stopped prematurely was the phase 2 DELIVERS study, which was set up to assess the benefits of topical diacerein in people with EB simplex. Diacerein, an extract of rhubarb root, was tested in 54 patients, who were randomized to apply either diacerein or vehicle ointment for 8 weeks.
Initially, the results “looked very promising,” Dr. Murrell said, because there was a trend toward improved EB simplex lesions, with the primary endpoint of at least a 60% reduction in lesions met by 57.1% of diacerein-treated and 53.8% of vehicle-treated patients.
However, the trial included use of the Investigator’s Global Assessment Scale at the FDA’s behest, but the tool had not been validated in previous EB trials, and which didn’t seem to show any benefit of the active over the placebo ointment. (The Investigator’s Global Assessment is a 5-point scale used for overall clinical assessment of severity of disease, ranging from 0 to 4, where a higher score denotes worse outcome.)In a poster presented separately at the meeting, the DELIVERS researchers noted that “the lack of statistical significance in the primary endpoint could be explained in part by milder disease in the diacerein group.” The mean body surface area of EB simplex lesions within the assessment area at baseline was 5.76% in the diacerein group and 7.13% in the vehicle group. The researchers proposed that perhaps a higher concentration of diacerein than the 1% used in the trial might have been needed.
Sirolimus and EB simplex
Dr. Murrell noted that a pilot study, known as the SISTERS trial, had been conducted with a 2% sirolimus topical ointment at her institution and at Stanford (Calif.) University. This prospective, double-blind study had involved 16 patients with EB simplex, in which blisters tend to be confined to the palms of the hands and soles of the feet. The patients were assigned to treat both feet with either topical sirolimus or a placebo cream for 12 weeks. After a 4-week wash-out period, the patients switched to using the opposite cream for an additional 12 weeks.
Sirolimus is an inhibitor of the mTOR pathway, and, according to a description of the study on ClinicalTrials.gov, the researchers’ aim was to inhibit “the mTOR pathway to down-regulate the translation of defective keratin proteins.” That would allow a transition from supportive care, which is the current practice for EB simplex, to using a targeted molecular therapy to improve patient mobility and quality of life, they note on the site.
“We look forward to having that study unblinded,” Dr. Murrell said, adding that “data should be ready in a few months.”
EASE and Oleogel-S10
Oleogel-S10 is a gel that contains a birch bark extract dissolved in sunflower oil. It is already approved in Europe (Episalvan) for the treatment of partial-thickness skin wounds, but its use in EB remains investigational.
In a poster presentation at the meeting, Stella Gewert, MD, of the University of Freiburg (Germany) and colleagues discussed their experience using Oleogel-S10 in the treatment of four patients – each with a different type of EB – who applied the gel for between 6 days and 3 months.
Promising effects were seen, including reduced pruritus and pain, wounds healing more quickly, and reductions in lesion size. “During treatment, dressing requirements were reduced, and patient quality of life improved,” the researchers observed.
Mark Sumeray, MD, the chief medical officer of Amryt Pharmaceuticals, which is developing Oleogel-S10, said it was important to emphasize that Oleogel-S10 is a gel and not a cream. Gels are mixed with oil and are easier to apply – an important consideration for those with EB, he explained, whereas creams tend to be mixed with water and are stickier.
The phase 3 EASE trial is looking at the efficacy and safety of the gel in patients with junctional and dystrophic EB, and recruitment is ongoing, Dr. Murrell said. The primary endpoint is the proportion of patients with the first complete closure of a target wound within 45 days of treatment initiation. The estimated primary completion date for the trial is June 2020, and it is projected to end by 2022.
Scioderm, in collaboration with Amicus, funded the ESSENCE trial; Castle Creek financed the DELIVERS study; Amryt is supporting the EASE study; and Stanford University is sponsor of the SISTERS study. Dr. Murrell has been the principal investigator for trials run by Amicus, Amryt, Castle Creek, and Shire, and she acknowledged receipt of honoraria or consultation fees from those companies and others. Dr. Gewert did not report any financial disclosures. Dr. Sumeray is an employee and shareholder of Amryt.
LONDON –
Results from trials such as ESSENCE, with allantoin, and DELIVERS, with diacerein, were “disappointing,” Dédée Murrell, BMBCh, MD, pointed out at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA).
Those two topical agents were most likely let down by the trials’ design, said Dr. Murrell, of St. George Hospital, University of New South Wales, Sydney, but she noted that there were still some promising trials that were either ongoing, such as EASE, with Oleogel-S10, or that were about to be unblinded, such as SISTERS, with sirolimus.
Epidermolysis bullosa (EB) is a group of rare genetic diseases that can cause the skin to blister and peel away to varying degrees, causing itchy and painful skin, as well as recurrent wounds, some of which may seem never to heal and that increase the risk for squamous cell carcinoma. Although finding a cure for the disease is high on the research agenda, finding a reliable therapy that can soothe and protect the skin is of equal importance.
Trials and tribulations
Conducting trials in rare diseases can be difficult because the studies are often small and poorly controlled, Dr. Murrell said during an oral presentation at the meeting. To gain regulatory approval, trials need to have an active and a placebo arm, because “even though we’re dealing with a rare disease, we still have to show statistical significance between the two arms.”
However, it is not just about finding enough participants who meet the inclusion criteria and adequately controlling the study, as finding funding can also be a significant hurdle. That is the case particularly when an existing drug with no patent protection is proposed to be repurposed. As an example, Dr. Murrell said that many patients with EB may use gentian violet to treat their condition, but it has been around for so long and is so widely used, that funding a trial to formally prove its merit is unlikely. In addition, “there are special caveats that occur in dermatology clinical trials with topical drugs that don’t exist [in trials] with systemic treatments, one of which is that it is very important to keep other variables the same,” Dr. Murrell said. “So, for example, the dressings need to stay the same throughout a trial with a topical therapy, because if you improve the dressings [during the course of the trial], you could mask the effect of the treatment.” Similarly, the bathing and cleansing routines of the participants need to remain the same throughout the trial.
“We also need to have validated instruments to prove whether these treatments are working, and the instruments need to be objective as well as subjective,” Dr. Murrell advised. For example, inflammation and blistering need to be scored separately from scarring and skin damage. “You have to conduct a clinical trial to be able to verify that there is diminished scarring or damage, because those are the longer-term complications.” Inflammation and blistering are valid endpoints to use in shorter-term studies.
Dr. Murrell also cautioned on getting too enthused about the results of case reports. “We do get excited when we see a patient using something new and they seem to be getting much better,” but such reports do not have a placebo arm, or, if there is one, then there is no vehicle control, she said. It’s important to include a run-in period in a trial to establish a new baseline and to ensure that any effects seen with a topical agent are independent of the carrier substance or any altered bathing behavior or dressing habits, which could skew the results.
ESSENCE and allantoin
So what went wrong in the phase 3 ESSENCE trial with allantoin, which was halted early in September 2017? The trial had included 169 patients with any type of EB – simplex, recessive dystrophic, and junctional non-Herlitz – who were randomized to treatment with the allantoin-containing cream SD-101 or a placebo cream containing only the vehicle. The creams were applied daily to the entire body for 3 months, with the primary endpoint being total wound closure at the end of the treatment period. Total wound closure was a requirement of the Food and Drug Administration, Dr. Murrell said, but it is now known that 100% closure is not always likely, which the agency itself now concedes.
“Most disappointingly, no significant difference was found [between the study drug and placebo], therefore it didn’t meet the primary endpoint, and you’re not even allowed to consider secondary endpoints – those are the rules of the game,” she said. As a result, the trial was stopped in 2017.
For inclusion in the study, patients had to have at least one target wound that had been present for at least 3 weeks, but there was no stratification on the duration of wounds in the randomization process. That meant that some individuals with wounds of shorter duration had unintentionally ended up in the placebo arm – favoring healing – and those with more chronic wounds had been in the allantoin arm. So, because the study arms might not have been equally balanced at baseline, it would have been harder for the actual treatment to demonstrate a benefit, Dr. Murrell suggested.
Another problem with the trial was that the vehicle cream contained elements, such as lanolin, already associated with wound healing. That would have given patients in the placebo arm an advantage because anyone applying the cream every day would probably get better or improve to some degree.
The patients were also required to have daily dressing changes and baths and, “if you give any patient that advice and they comply with it for a period of time, they are going to improve,” whether or not they are applying the study drug. Dr. Murrell said that the researchers likely should have done a run-in period first and then established a new baseline to randomize the patients.
“Lastly, no one had ever done a study of what we essentially tell eczema patients to do every day … to moisturize, because that will provide extra protection and barrier to their skin. So, if anything, the ESSENCE study shows that moisturizing has a protective effect of the vehicle for patients with EB,” she said.
DELIVERS and diacerein
Another trial that was stopped prematurely was the phase 2 DELIVERS study, which was set up to assess the benefits of topical diacerein in people with EB simplex. Diacerein, an extract of rhubarb root, was tested in 54 patients, who were randomized to apply either diacerein or vehicle ointment for 8 weeks.
Initially, the results “looked very promising,” Dr. Murrell said, because there was a trend toward improved EB simplex lesions, with the primary endpoint of at least a 60% reduction in lesions met by 57.1% of diacerein-treated and 53.8% of vehicle-treated patients.
However, the trial included use of the Investigator’s Global Assessment Scale at the FDA’s behest, but the tool had not been validated in previous EB trials, and which didn’t seem to show any benefit of the active over the placebo ointment. (The Investigator’s Global Assessment is a 5-point scale used for overall clinical assessment of severity of disease, ranging from 0 to 4, where a higher score denotes worse outcome.)In a poster presented separately at the meeting, the DELIVERS researchers noted that “the lack of statistical significance in the primary endpoint could be explained in part by milder disease in the diacerein group.” The mean body surface area of EB simplex lesions within the assessment area at baseline was 5.76% in the diacerein group and 7.13% in the vehicle group. The researchers proposed that perhaps a higher concentration of diacerein than the 1% used in the trial might have been needed.
Sirolimus and EB simplex
Dr. Murrell noted that a pilot study, known as the SISTERS trial, had been conducted with a 2% sirolimus topical ointment at her institution and at Stanford (Calif.) University. This prospective, double-blind study had involved 16 patients with EB simplex, in which blisters tend to be confined to the palms of the hands and soles of the feet. The patients were assigned to treat both feet with either topical sirolimus or a placebo cream for 12 weeks. After a 4-week wash-out period, the patients switched to using the opposite cream for an additional 12 weeks.
Sirolimus is an inhibitor of the mTOR pathway, and, according to a description of the study on ClinicalTrials.gov, the researchers’ aim was to inhibit “the mTOR pathway to down-regulate the translation of defective keratin proteins.” That would allow a transition from supportive care, which is the current practice for EB simplex, to using a targeted molecular therapy to improve patient mobility and quality of life, they note on the site.
“We look forward to having that study unblinded,” Dr. Murrell said, adding that “data should be ready in a few months.”
EASE and Oleogel-S10
Oleogel-S10 is a gel that contains a birch bark extract dissolved in sunflower oil. It is already approved in Europe (Episalvan) for the treatment of partial-thickness skin wounds, but its use in EB remains investigational.
In a poster presentation at the meeting, Stella Gewert, MD, of the University of Freiburg (Germany) and colleagues discussed their experience using Oleogel-S10 in the treatment of four patients – each with a different type of EB – who applied the gel for between 6 days and 3 months.
Promising effects were seen, including reduced pruritus and pain, wounds healing more quickly, and reductions in lesion size. “During treatment, dressing requirements were reduced, and patient quality of life improved,” the researchers observed.
Mark Sumeray, MD, the chief medical officer of Amryt Pharmaceuticals, which is developing Oleogel-S10, said it was important to emphasize that Oleogel-S10 is a gel and not a cream. Gels are mixed with oil and are easier to apply – an important consideration for those with EB, he explained, whereas creams tend to be mixed with water and are stickier.
The phase 3 EASE trial is looking at the efficacy and safety of the gel in patients with junctional and dystrophic EB, and recruitment is ongoing, Dr. Murrell said. The primary endpoint is the proportion of patients with the first complete closure of a target wound within 45 days of treatment initiation. The estimated primary completion date for the trial is June 2020, and it is projected to end by 2022.
Scioderm, in collaboration with Amicus, funded the ESSENCE trial; Castle Creek financed the DELIVERS study; Amryt is supporting the EASE study; and Stanford University is sponsor of the SISTERS study. Dr. Murrell has been the principal investigator for trials run by Amicus, Amryt, Castle Creek, and Shire, and she acknowledged receipt of honoraria or consultation fees from those companies and others. Dr. Gewert did not report any financial disclosures. Dr. Sumeray is an employee and shareholder of Amryt.
EXPERT ANALYSIS FROM EB 2020
Breaking bacterial communication may heal EB wounds
LONDON – Disrupting how microorganisms communicate with each other could be a way to overcome antibiotic resistance and to help heal chronic wounds in patients with epidermolysis bullosa (EB), according to presenters at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA).
The majority of chronic wounds in patients with EB are colonized with microorganisms, with a predominance of Staphylococcus species, said Erik Gerner, an industrial PhD student at Mölnlycke Health Care in Gothenburg, Sweden, and Gothenburg University.
Because of the growing problem of antibiotic resistance, alternative treatments are needed, and one possible alternative for treating infected wounds could be interfering with quorum sensing, the cell-to-cell communication used by bacteria, he said. He is hoping to explore this possibility as a novel treatment strategy for infected wounds.
“Quorum sensing is defined as the ability to detect and respond to population density,” Mr. Gerner said, noting that, when there is a sufficient density of bacteria, “they start to communicate with each other.” This enables them to act as a community and perform actions that they could not do as individual cells. Such actions include forming biofilms, which helps protect bacteria from their environment, such as the immune system. Other actions include collectively switching on the production of virulence factors and becoming resistant to treatments.
“Bacteria use quorum sensing to act collectively,” Mr. Gerner said. “If we could shut down this quorum sensing system, it would be very beneficial … and increase the chances to heal the wound.”
The quorum sensing system is based on the production of signaling molecules called AHL (N-acyl homoserine lactones), which are constantly produced at a low rate. This isn’t a problem until the level of bacteria increases and the level of quorum sensing breaches a threshold, he explained.
There are several benefits of inhibiting bacterial communication through disrupting quorum sensing, namely, “a low risk of resistance,” Mr. Gerner said. There is also potentially less toxin production by bacteria, and this could help the immune system in killing the invading bacteria.
One approach to disrupting quorum testing that Mr. Gerner has been investigating is the use of sodium salicylate (NaSa). So far, preclinical work shows that NaSa can reduce toxin production but not the growth rate of bacteria. The advantage of using NaSa is that it is nontoxic to human dermal fibroblasts, with similar results seen in human keratinocytes and immune cells. His work to date has shown that NaSa reduced activity of NF-kB (a proinflammatory signaling pathway) in differentiated and lipopolysaccharide-stimulated monocytes; NF-kB activated production of proinflammatory cytokines (such as interleukin-1 beta and IL-6) are elevated in EB wounds. “My studies support the bodies of evidence that bacteria use quorum sensing to coordinate … and to produce a large number of toxic factors,” Mr. Gerner concluded. Future studies will look at the potential of NaSa to disrupt this activity.
Skin microbiome of EB wounds
Liat Samuelov, MD, of the department of molecular dermatology at Tel Aviv (Israel) Sourasky Medical Center, presented data on skin microbiome characteristics in eight patients with recessive dystrophic EB (RDEB). This showed that there was reduced bacterial diversity in wounds, and a “progressive development of dysbiosis across different stages of DEB wound formation.”
The skin microbiome has been implicated in several skin diseases, Dr. Samuelov and associates observed in a poster presentation. That includes the autoimmune blistering disease bullous pemphigoid (Exp Dermatol. 2017 Dec;26[12]:1221-7). “Colonization of DEB chronic wounds may lead to systemic infections, result in delayed healing, and possibly be involved in the development of squamous cell carcinoma,” they noted in the poster, “thus accurate delineation of the dysbiotic profile … may point to corrective measures of great therapeutic potential.”
The aim was to see what microorganisms were present in the chronic wounds of the patients. To be included in the study, patients must not have had any antibiotic treatment – oral or topical – in the past 6 months. Samples were taken from an untreated wound, around the wound, and from uninvolved skin, which were compared with samples taken from similar areas in age-matched controls.
Reduced bacterial diversity was observed in RDEB wounds, compared with uninvolved or perilesional areas and the skin of control subjects, Dr. Samuelov said in an oral presentation of the study results. There was increased abundance of Staphylococcus epidermidis and decreased Cutibacterium acnes, which she noted was in contrast to other studies where S. aureus was the most common colonizer in RDEB wounds.
Bacterial composition in each group was calculated using the beta-diversity score, while control samples showed similar microbial composition, the DEB samples had no microbial similarities among different samples. These data “suggest the need to ascertain the potential therapeutic benefit of interventions aimed at restoring normal microbiome composition in DEB,” Dr. Samuelov concluded.
Wound colonization and squamous cell carcinoma
Other research on wound microbiology was presented by Laura E. Levin, MD, a dermatologist at New York–Presbyterian, and associates. “Given the potential role of bacteria-induced inflammation in the development of wound-associated SCC [squamous cell carcinoma] in a subset of patients, we sought to improve our understanding of what microbes colonize and infect the wounds of patients with epidermolysis bullosa,” they explained in their poster.
The researchers, from New York–Presbyterian Morgan Stanley Children’s Hospital and Columbia University Irvine Medical Center, New York, presented data from a retrospective analysis of 739 wound cultures taken between 2001 and 2017 from 158 patients enrolled in the Epidermolysis Bullosa Clinical Characterization and Outcomes Database. In the analysis, just under 70% of patients had DEB, of which 90% were of the RDEB subtype; 13% had EB simplex, 14% had junctional EB, and 3% had an unknown EB subtype.
At least one organism grew in 87% of cultures, with the most common microorganism isolated being Staphylococcus aureus (84% of cultures). Other commonly isolated microbes were Pseudomonas aeruginosa in 35% of cultures, Streptococcus group A in 34% of cultures (of which 22% were Streptococcus pyogenes), Corynebacterium species in 31% of cultures, and Proteus species in 18% of cultures.
“Improved understanding of what microbes are colonizing the wounds of our patients may help improve antibiotic stewardship,” the researchers stated.
Looking at the antibiotic susceptibilities, Dr. Levin and associates found that 68% of 115 cultures were sensitive to methicillin and 60% of 15 cultures were sensitive to mupirocin. “Resistance to many systemic and topical antibiotic agents in EB patients supports surveillance cultures with routine testing for mupirocin susceptibility,” they suggested.
A total of 23 patients developed SCC of whom 10 had cultures that grew S. aureus (90%) and P. aeruginosa (50%), and Proteus species (20%). Among the patients who did not develop SCC, the respective cultures positive for each of those microorganisms were 83%, 34%, and 11%. Perhaps “gram-negative and flagellated organisms may be more common in wounds of patients at risk for SCC,” they observed, adding that further studies were needed to determine if “wound microbiome interventions inhibit the risk of development of SCC and improve outcomes.”
Mr. Gerner’s research is supported by Mölnlycke Health Care. Dr. Samuelov had no disclosures. The work by Dr. Levin and associates is supported by the Pediatric Dermatology Research Alliance, EB Research Partnership, and the Epidermolysis Bullosa Medical Research Foundation.
LONDON – Disrupting how microorganisms communicate with each other could be a way to overcome antibiotic resistance and to help heal chronic wounds in patients with epidermolysis bullosa (EB), according to presenters at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA).
The majority of chronic wounds in patients with EB are colonized with microorganisms, with a predominance of Staphylococcus species, said Erik Gerner, an industrial PhD student at Mölnlycke Health Care in Gothenburg, Sweden, and Gothenburg University.
Because of the growing problem of antibiotic resistance, alternative treatments are needed, and one possible alternative for treating infected wounds could be interfering with quorum sensing, the cell-to-cell communication used by bacteria, he said. He is hoping to explore this possibility as a novel treatment strategy for infected wounds.
“Quorum sensing is defined as the ability to detect and respond to population density,” Mr. Gerner said, noting that, when there is a sufficient density of bacteria, “they start to communicate with each other.” This enables them to act as a community and perform actions that they could not do as individual cells. Such actions include forming biofilms, which helps protect bacteria from their environment, such as the immune system. Other actions include collectively switching on the production of virulence factors and becoming resistant to treatments.
“Bacteria use quorum sensing to act collectively,” Mr. Gerner said. “If we could shut down this quorum sensing system, it would be very beneficial … and increase the chances to heal the wound.”
The quorum sensing system is based on the production of signaling molecules called AHL (N-acyl homoserine lactones), which are constantly produced at a low rate. This isn’t a problem until the level of bacteria increases and the level of quorum sensing breaches a threshold, he explained.
There are several benefits of inhibiting bacterial communication through disrupting quorum sensing, namely, “a low risk of resistance,” Mr. Gerner said. There is also potentially less toxin production by bacteria, and this could help the immune system in killing the invading bacteria.
One approach to disrupting quorum testing that Mr. Gerner has been investigating is the use of sodium salicylate (NaSa). So far, preclinical work shows that NaSa can reduce toxin production but not the growth rate of bacteria. The advantage of using NaSa is that it is nontoxic to human dermal fibroblasts, with similar results seen in human keratinocytes and immune cells. His work to date has shown that NaSa reduced activity of NF-kB (a proinflammatory signaling pathway) in differentiated and lipopolysaccharide-stimulated monocytes; NF-kB activated production of proinflammatory cytokines (such as interleukin-1 beta and IL-6) are elevated in EB wounds. “My studies support the bodies of evidence that bacteria use quorum sensing to coordinate … and to produce a large number of toxic factors,” Mr. Gerner concluded. Future studies will look at the potential of NaSa to disrupt this activity.
Skin microbiome of EB wounds
Liat Samuelov, MD, of the department of molecular dermatology at Tel Aviv (Israel) Sourasky Medical Center, presented data on skin microbiome characteristics in eight patients with recessive dystrophic EB (RDEB). This showed that there was reduced bacterial diversity in wounds, and a “progressive development of dysbiosis across different stages of DEB wound formation.”
The skin microbiome has been implicated in several skin diseases, Dr. Samuelov and associates observed in a poster presentation. That includes the autoimmune blistering disease bullous pemphigoid (Exp Dermatol. 2017 Dec;26[12]:1221-7). “Colonization of DEB chronic wounds may lead to systemic infections, result in delayed healing, and possibly be involved in the development of squamous cell carcinoma,” they noted in the poster, “thus accurate delineation of the dysbiotic profile … may point to corrective measures of great therapeutic potential.”
The aim was to see what microorganisms were present in the chronic wounds of the patients. To be included in the study, patients must not have had any antibiotic treatment – oral or topical – in the past 6 months. Samples were taken from an untreated wound, around the wound, and from uninvolved skin, which were compared with samples taken from similar areas in age-matched controls.
Reduced bacterial diversity was observed in RDEB wounds, compared with uninvolved or perilesional areas and the skin of control subjects, Dr. Samuelov said in an oral presentation of the study results. There was increased abundance of Staphylococcus epidermidis and decreased Cutibacterium acnes, which she noted was in contrast to other studies where S. aureus was the most common colonizer in RDEB wounds.
Bacterial composition in each group was calculated using the beta-diversity score, while control samples showed similar microbial composition, the DEB samples had no microbial similarities among different samples. These data “suggest the need to ascertain the potential therapeutic benefit of interventions aimed at restoring normal microbiome composition in DEB,” Dr. Samuelov concluded.
Wound colonization and squamous cell carcinoma
Other research on wound microbiology was presented by Laura E. Levin, MD, a dermatologist at New York–Presbyterian, and associates. “Given the potential role of bacteria-induced inflammation in the development of wound-associated SCC [squamous cell carcinoma] in a subset of patients, we sought to improve our understanding of what microbes colonize and infect the wounds of patients with epidermolysis bullosa,” they explained in their poster.
The researchers, from New York–Presbyterian Morgan Stanley Children’s Hospital and Columbia University Irvine Medical Center, New York, presented data from a retrospective analysis of 739 wound cultures taken between 2001 and 2017 from 158 patients enrolled in the Epidermolysis Bullosa Clinical Characterization and Outcomes Database. In the analysis, just under 70% of patients had DEB, of which 90% were of the RDEB subtype; 13% had EB simplex, 14% had junctional EB, and 3% had an unknown EB subtype.
At least one organism grew in 87% of cultures, with the most common microorganism isolated being Staphylococcus aureus (84% of cultures). Other commonly isolated microbes were Pseudomonas aeruginosa in 35% of cultures, Streptococcus group A in 34% of cultures (of which 22% were Streptococcus pyogenes), Corynebacterium species in 31% of cultures, and Proteus species in 18% of cultures.
“Improved understanding of what microbes are colonizing the wounds of our patients may help improve antibiotic stewardship,” the researchers stated.
Looking at the antibiotic susceptibilities, Dr. Levin and associates found that 68% of 115 cultures were sensitive to methicillin and 60% of 15 cultures were sensitive to mupirocin. “Resistance to many systemic and topical antibiotic agents in EB patients supports surveillance cultures with routine testing for mupirocin susceptibility,” they suggested.
A total of 23 patients developed SCC of whom 10 had cultures that grew S. aureus (90%) and P. aeruginosa (50%), and Proteus species (20%). Among the patients who did not develop SCC, the respective cultures positive for each of those microorganisms were 83%, 34%, and 11%. Perhaps “gram-negative and flagellated organisms may be more common in wounds of patients at risk for SCC,” they observed, adding that further studies were needed to determine if “wound microbiome interventions inhibit the risk of development of SCC and improve outcomes.”
Mr. Gerner’s research is supported by Mölnlycke Health Care. Dr. Samuelov had no disclosures. The work by Dr. Levin and associates is supported by the Pediatric Dermatology Research Alliance, EB Research Partnership, and the Epidermolysis Bullosa Medical Research Foundation.
LONDON – Disrupting how microorganisms communicate with each other could be a way to overcome antibiotic resistance and to help heal chronic wounds in patients with epidermolysis bullosa (EB), according to presenters at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA).
The majority of chronic wounds in patients with EB are colonized with microorganisms, with a predominance of Staphylococcus species, said Erik Gerner, an industrial PhD student at Mölnlycke Health Care in Gothenburg, Sweden, and Gothenburg University.
Because of the growing problem of antibiotic resistance, alternative treatments are needed, and one possible alternative for treating infected wounds could be interfering with quorum sensing, the cell-to-cell communication used by bacteria, he said. He is hoping to explore this possibility as a novel treatment strategy for infected wounds.
“Quorum sensing is defined as the ability to detect and respond to population density,” Mr. Gerner said, noting that, when there is a sufficient density of bacteria, “they start to communicate with each other.” This enables them to act as a community and perform actions that they could not do as individual cells. Such actions include forming biofilms, which helps protect bacteria from their environment, such as the immune system. Other actions include collectively switching on the production of virulence factors and becoming resistant to treatments.
“Bacteria use quorum sensing to act collectively,” Mr. Gerner said. “If we could shut down this quorum sensing system, it would be very beneficial … and increase the chances to heal the wound.”
The quorum sensing system is based on the production of signaling molecules called AHL (N-acyl homoserine lactones), which are constantly produced at a low rate. This isn’t a problem until the level of bacteria increases and the level of quorum sensing breaches a threshold, he explained.
There are several benefits of inhibiting bacterial communication through disrupting quorum sensing, namely, “a low risk of resistance,” Mr. Gerner said. There is also potentially less toxin production by bacteria, and this could help the immune system in killing the invading bacteria.
One approach to disrupting quorum testing that Mr. Gerner has been investigating is the use of sodium salicylate (NaSa). So far, preclinical work shows that NaSa can reduce toxin production but not the growth rate of bacteria. The advantage of using NaSa is that it is nontoxic to human dermal fibroblasts, with similar results seen in human keratinocytes and immune cells. His work to date has shown that NaSa reduced activity of NF-kB (a proinflammatory signaling pathway) in differentiated and lipopolysaccharide-stimulated monocytes; NF-kB activated production of proinflammatory cytokines (such as interleukin-1 beta and IL-6) are elevated in EB wounds. “My studies support the bodies of evidence that bacteria use quorum sensing to coordinate … and to produce a large number of toxic factors,” Mr. Gerner concluded. Future studies will look at the potential of NaSa to disrupt this activity.
Skin microbiome of EB wounds
Liat Samuelov, MD, of the department of molecular dermatology at Tel Aviv (Israel) Sourasky Medical Center, presented data on skin microbiome characteristics in eight patients with recessive dystrophic EB (RDEB). This showed that there was reduced bacterial diversity in wounds, and a “progressive development of dysbiosis across different stages of DEB wound formation.”
The skin microbiome has been implicated in several skin diseases, Dr. Samuelov and associates observed in a poster presentation. That includes the autoimmune blistering disease bullous pemphigoid (Exp Dermatol. 2017 Dec;26[12]:1221-7). “Colonization of DEB chronic wounds may lead to systemic infections, result in delayed healing, and possibly be involved in the development of squamous cell carcinoma,” they noted in the poster, “thus accurate delineation of the dysbiotic profile … may point to corrective measures of great therapeutic potential.”
The aim was to see what microorganisms were present in the chronic wounds of the patients. To be included in the study, patients must not have had any antibiotic treatment – oral or topical – in the past 6 months. Samples were taken from an untreated wound, around the wound, and from uninvolved skin, which were compared with samples taken from similar areas in age-matched controls.
Reduced bacterial diversity was observed in RDEB wounds, compared with uninvolved or perilesional areas and the skin of control subjects, Dr. Samuelov said in an oral presentation of the study results. There was increased abundance of Staphylococcus epidermidis and decreased Cutibacterium acnes, which she noted was in contrast to other studies where S. aureus was the most common colonizer in RDEB wounds.
Bacterial composition in each group was calculated using the beta-diversity score, while control samples showed similar microbial composition, the DEB samples had no microbial similarities among different samples. These data “suggest the need to ascertain the potential therapeutic benefit of interventions aimed at restoring normal microbiome composition in DEB,” Dr. Samuelov concluded.
Wound colonization and squamous cell carcinoma
Other research on wound microbiology was presented by Laura E. Levin, MD, a dermatologist at New York–Presbyterian, and associates. “Given the potential role of bacteria-induced inflammation in the development of wound-associated SCC [squamous cell carcinoma] in a subset of patients, we sought to improve our understanding of what microbes colonize and infect the wounds of patients with epidermolysis bullosa,” they explained in their poster.
The researchers, from New York–Presbyterian Morgan Stanley Children’s Hospital and Columbia University Irvine Medical Center, New York, presented data from a retrospective analysis of 739 wound cultures taken between 2001 and 2017 from 158 patients enrolled in the Epidermolysis Bullosa Clinical Characterization and Outcomes Database. In the analysis, just under 70% of patients had DEB, of which 90% were of the RDEB subtype; 13% had EB simplex, 14% had junctional EB, and 3% had an unknown EB subtype.
At least one organism grew in 87% of cultures, with the most common microorganism isolated being Staphylococcus aureus (84% of cultures). Other commonly isolated microbes were Pseudomonas aeruginosa in 35% of cultures, Streptococcus group A in 34% of cultures (of which 22% were Streptococcus pyogenes), Corynebacterium species in 31% of cultures, and Proteus species in 18% of cultures.
“Improved understanding of what microbes are colonizing the wounds of our patients may help improve antibiotic stewardship,” the researchers stated.
Looking at the antibiotic susceptibilities, Dr. Levin and associates found that 68% of 115 cultures were sensitive to methicillin and 60% of 15 cultures were sensitive to mupirocin. “Resistance to many systemic and topical antibiotic agents in EB patients supports surveillance cultures with routine testing for mupirocin susceptibility,” they suggested.
A total of 23 patients developed SCC of whom 10 had cultures that grew S. aureus (90%) and P. aeruginosa (50%), and Proteus species (20%). Among the patients who did not develop SCC, the respective cultures positive for each of those microorganisms were 83%, 34%, and 11%. Perhaps “gram-negative and flagellated organisms may be more common in wounds of patients at risk for SCC,” they observed, adding that further studies were needed to determine if “wound microbiome interventions inhibit the risk of development of SCC and improve outcomes.”
Mr. Gerner’s research is supported by Mölnlycke Health Care. Dr. Samuelov had no disclosures. The work by Dr. Levin and associates is supported by the Pediatric Dermatology Research Alliance, EB Research Partnership, and the Epidermolysis Bullosa Medical Research Foundation.
REPORTING FROM EB 2020
Esophageal stricture signals urgent treatment in kids with butterfly skin
LONDON – A quarter of urgent contacts in 20 children with generalized severe recessive dystrophic epidermolysis bullosa (GS-RDEB) were tied to esophageal narrowing, according data from a 12-month review of electronic health records.
Urgent advice was sought 102 times outside of regular or scheduled appointments by the parents of 20 children with GS-RDEB, Christine Prodinger, MD, of the University Clinic of Dermatology at Paracelsus Medical University, Salzburg, Austria, and colleagues reported in a poster presentation at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA). The researchers looked at the records from the EB clinic at Great Ormond Street Hospital for Children NHS Foundation Trust, London, during April 2018–April 2019.
The mean number of urgent contacts with the specialist unit was 5.1 per patient per year, the researchers reported, with 24 of the 102 contacts (23.5%) resulting in the child being admitted to a hospital. Most of the contacts were made via email or telephone to EB nurses (94%), by contacts during home visits (3%), or in an appointment with the palliative or symptom care team (3%).
“The most common reason [for the urgent contact] was acute dysphagia,” which was experienced as choking, throat pain, difficulty eating, reflux, and vomiting, the researchers observed. Dysphagia affected children in 27 of the contacts (26.5%), and resulted in esophageal dilatation in 90% of the cases. Other reasons for urgent contact were skin infection (15.7% of contacts), uncontrolled pain (15.7% of the contacts), and eye problems (11.8%).
Esophageal dilatation
Strictures are just one of the esophageal manifestations of the disease, noted Anna Bruckner, MD, associate professor of dermatology and pediatrics in the department of dermatology at the University of Colorado at Denver, Aurora, during an oral presentation. Other possible manifestations include blisters and erosions, the formation of webs – a thin extension of esophageal tissue, perforations, and rupture. “These are primarily problems with dystrophic EB” but can occur with other EB subtypes, she noted.
“We don’t have great evidence” on whether the onset of esophageal strictures can be delayed or prevented, Dr. Bruckner observed. As for management, “fluoroscopy-guided balloon dilatation is probably best” for most patients, but the best procedural approach needs to be discussed on a patient-by-patient basis.
Citing a paper that documents her own experience on the use of esophageal dilatation in 24 children who underwent 231 fluoroscopy-guided balloon dilatation procedures, Dr. Bruckner noted that strictures were most commonly located in the proximal part of the esophagus, with a median distance of 13 cm down from the lips (J Pediatr Gastroenterol Nutr. 2018;67[6]:701-5).
The retrospective chart review reported by Dr. Bruckner showed that there were a median of seven dilatation procedures per patient, and 20 patients had repeated procedures at a median interval of 164 days. About 10% of procedures resulted in adverse events – mostly vomiting, pain, and fever – but there were no perforations or other serious effects, and the rate of subsequent hospitalization was 6.9%.
Dysphagia
Dysphagia was the predominant symptom caused by esophageal stricture in another dataset reported in a poster by Elena Pope, MD, MSc, of the Hospital for Sick Children at the University of Toronto, and colleagues.
Of 125 EB patients who had experienced at least 1 esophageal stricture episode, 497 esophageal stricture events were reported, and 85.5% of patients had difficulty swallowing at presentation, with 29.8% unable to swallow solids and 7.2% unable to swallow liquids. Other symptoms at presentation were painful swallowing (11%), food being stuck in the esophagus (8%), regurgitation (5%), coughing (4.8%), and dyspepsia (2.8%).
The aim of the retrospective, multicenter cohort study was to determine the prevalence of, and predisposing factors for, restenosis of esophageal strictures and factors that may predispose to restenosis. The study population consisted of 66 men and 59 women who had experienced their esophageal stricture at around ages 12-13 years. The majority (98.4%) had dystrophic EB, of which almost half (46.5%) had GS-RDEB.
The researchers found that the location of the esophageal stricture was important for restenosis, and that strictures occurring in the lower esophagus were 67.5% less likely to result in restenosis than if they occurred in the upper esophagus (P = .057; hazard ratio, 0.675).
A higher number of strictures was associated with a higher rate of restenosis, they reported. Indeed, patients who had two esophageal strictures had a 29.4% increased risk of restenosis, compared with those who had just one stricture (P = .038; HR, 1.294), and those with three or more strictures had an increased risk of 78.5%, compared with those having one stricture (P = .005; HR, 1.785).
Strictures longer than 1 cm also were associated with a greater (34.7%) risk of restenosis, compared with shorter strictures (P = .032; HR, 1.347). Various methods of resolving the stricture were used, from fluoroscopy-guided balloon dilatation to retro- or antegrade endoscopy. “Irrespective of method, dilatations are successful,” Dr. Pope and colleagues reported. The overall success of dilatation was 99.3%, with full dilatation achieved in almost all of the patients (96%). Of note is that there was a low risk (2.6%) of complications, they observed.
Medications were used in 46.8% of the patients, with the most popular choice being corticosteroids (90.3%), but the researchers noted that the “potential benefit of periprocedural corticosteroids use in decreasing the risk of restenosis needs further exploration.”
Dr. Bruckner had noted in her presentation that her group did not favor the use of periprocedural corticosteroids, but that antifibrotic therapy “could be attractive” for preventing future strictures.
Dr. Prodinger, Dr. Pope, and their colleagues did not provide disclosure information. Dr. Bruckner is the principal investigator for the Epidermolysis Bullosa Clinical Characterization and Outcomes Database. She disclosed the receipt of grants or research funding, honoraria, or consultation fees from a number of drug companies, as well as other support from the EB Research Partnership and the EB Medical Research Foundation.
SOURCES: Prodinger et al. EB 2020. Poster 3; Bruckner A et al. Pediatr Gastroenterol Nutr. 2018;67(6):701-5; Pope et al. EB 2020. Poster 8.
LONDON – A quarter of urgent contacts in 20 children with generalized severe recessive dystrophic epidermolysis bullosa (GS-RDEB) were tied to esophageal narrowing, according data from a 12-month review of electronic health records.
Urgent advice was sought 102 times outside of regular or scheduled appointments by the parents of 20 children with GS-RDEB, Christine Prodinger, MD, of the University Clinic of Dermatology at Paracelsus Medical University, Salzburg, Austria, and colleagues reported in a poster presentation at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA). The researchers looked at the records from the EB clinic at Great Ormond Street Hospital for Children NHS Foundation Trust, London, during April 2018–April 2019.
The mean number of urgent contacts with the specialist unit was 5.1 per patient per year, the researchers reported, with 24 of the 102 contacts (23.5%) resulting in the child being admitted to a hospital. Most of the contacts were made via email or telephone to EB nurses (94%), by contacts during home visits (3%), or in an appointment with the palliative or symptom care team (3%).
“The most common reason [for the urgent contact] was acute dysphagia,” which was experienced as choking, throat pain, difficulty eating, reflux, and vomiting, the researchers observed. Dysphagia affected children in 27 of the contacts (26.5%), and resulted in esophageal dilatation in 90% of the cases. Other reasons for urgent contact were skin infection (15.7% of contacts), uncontrolled pain (15.7% of the contacts), and eye problems (11.8%).
Esophageal dilatation
Strictures are just one of the esophageal manifestations of the disease, noted Anna Bruckner, MD, associate professor of dermatology and pediatrics in the department of dermatology at the University of Colorado at Denver, Aurora, during an oral presentation. Other possible manifestations include blisters and erosions, the formation of webs – a thin extension of esophageal tissue, perforations, and rupture. “These are primarily problems with dystrophic EB” but can occur with other EB subtypes, she noted.
“We don’t have great evidence” on whether the onset of esophageal strictures can be delayed or prevented, Dr. Bruckner observed. As for management, “fluoroscopy-guided balloon dilatation is probably best” for most patients, but the best procedural approach needs to be discussed on a patient-by-patient basis.
Citing a paper that documents her own experience on the use of esophageal dilatation in 24 children who underwent 231 fluoroscopy-guided balloon dilatation procedures, Dr. Bruckner noted that strictures were most commonly located in the proximal part of the esophagus, with a median distance of 13 cm down from the lips (J Pediatr Gastroenterol Nutr. 2018;67[6]:701-5).
The retrospective chart review reported by Dr. Bruckner showed that there were a median of seven dilatation procedures per patient, and 20 patients had repeated procedures at a median interval of 164 days. About 10% of procedures resulted in adverse events – mostly vomiting, pain, and fever – but there were no perforations or other serious effects, and the rate of subsequent hospitalization was 6.9%.
Dysphagia
Dysphagia was the predominant symptom caused by esophageal stricture in another dataset reported in a poster by Elena Pope, MD, MSc, of the Hospital for Sick Children at the University of Toronto, and colleagues.
Of 125 EB patients who had experienced at least 1 esophageal stricture episode, 497 esophageal stricture events were reported, and 85.5% of patients had difficulty swallowing at presentation, with 29.8% unable to swallow solids and 7.2% unable to swallow liquids. Other symptoms at presentation were painful swallowing (11%), food being stuck in the esophagus (8%), regurgitation (5%), coughing (4.8%), and dyspepsia (2.8%).
The aim of the retrospective, multicenter cohort study was to determine the prevalence of, and predisposing factors for, restenosis of esophageal strictures and factors that may predispose to restenosis. The study population consisted of 66 men and 59 women who had experienced their esophageal stricture at around ages 12-13 years. The majority (98.4%) had dystrophic EB, of which almost half (46.5%) had GS-RDEB.
The researchers found that the location of the esophageal stricture was important for restenosis, and that strictures occurring in the lower esophagus were 67.5% less likely to result in restenosis than if they occurred in the upper esophagus (P = .057; hazard ratio, 0.675).
A higher number of strictures was associated with a higher rate of restenosis, they reported. Indeed, patients who had two esophageal strictures had a 29.4% increased risk of restenosis, compared with those who had just one stricture (P = .038; HR, 1.294), and those with three or more strictures had an increased risk of 78.5%, compared with those having one stricture (P = .005; HR, 1.785).
Strictures longer than 1 cm also were associated with a greater (34.7%) risk of restenosis, compared with shorter strictures (P = .032; HR, 1.347). Various methods of resolving the stricture were used, from fluoroscopy-guided balloon dilatation to retro- or antegrade endoscopy. “Irrespective of method, dilatations are successful,” Dr. Pope and colleagues reported. The overall success of dilatation was 99.3%, with full dilatation achieved in almost all of the patients (96%). Of note is that there was a low risk (2.6%) of complications, they observed.
Medications were used in 46.8% of the patients, with the most popular choice being corticosteroids (90.3%), but the researchers noted that the “potential benefit of periprocedural corticosteroids use in decreasing the risk of restenosis needs further exploration.”
Dr. Bruckner had noted in her presentation that her group did not favor the use of periprocedural corticosteroids, but that antifibrotic therapy “could be attractive” for preventing future strictures.
Dr. Prodinger, Dr. Pope, and their colleagues did not provide disclosure information. Dr. Bruckner is the principal investigator for the Epidermolysis Bullosa Clinical Characterization and Outcomes Database. She disclosed the receipt of grants or research funding, honoraria, or consultation fees from a number of drug companies, as well as other support from the EB Research Partnership and the EB Medical Research Foundation.
SOURCES: Prodinger et al. EB 2020. Poster 3; Bruckner A et al. Pediatr Gastroenterol Nutr. 2018;67(6):701-5; Pope et al. EB 2020. Poster 8.
LONDON – A quarter of urgent contacts in 20 children with generalized severe recessive dystrophic epidermolysis bullosa (GS-RDEB) were tied to esophageal narrowing, according data from a 12-month review of electronic health records.
Urgent advice was sought 102 times outside of regular or scheduled appointments by the parents of 20 children with GS-RDEB, Christine Prodinger, MD, of the University Clinic of Dermatology at Paracelsus Medical University, Salzburg, Austria, and colleagues reported in a poster presentation at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA). The researchers looked at the records from the EB clinic at Great Ormond Street Hospital for Children NHS Foundation Trust, London, during April 2018–April 2019.
The mean number of urgent contacts with the specialist unit was 5.1 per patient per year, the researchers reported, with 24 of the 102 contacts (23.5%) resulting in the child being admitted to a hospital. Most of the contacts were made via email or telephone to EB nurses (94%), by contacts during home visits (3%), or in an appointment with the palliative or symptom care team (3%).
“The most common reason [for the urgent contact] was acute dysphagia,” which was experienced as choking, throat pain, difficulty eating, reflux, and vomiting, the researchers observed. Dysphagia affected children in 27 of the contacts (26.5%), and resulted in esophageal dilatation in 90% of the cases. Other reasons for urgent contact were skin infection (15.7% of contacts), uncontrolled pain (15.7% of the contacts), and eye problems (11.8%).
Esophageal dilatation
Strictures are just one of the esophageal manifestations of the disease, noted Anna Bruckner, MD, associate professor of dermatology and pediatrics in the department of dermatology at the University of Colorado at Denver, Aurora, during an oral presentation. Other possible manifestations include blisters and erosions, the formation of webs – a thin extension of esophageal tissue, perforations, and rupture. “These are primarily problems with dystrophic EB” but can occur with other EB subtypes, she noted.
“We don’t have great evidence” on whether the onset of esophageal strictures can be delayed or prevented, Dr. Bruckner observed. As for management, “fluoroscopy-guided balloon dilatation is probably best” for most patients, but the best procedural approach needs to be discussed on a patient-by-patient basis.
Citing a paper that documents her own experience on the use of esophageal dilatation in 24 children who underwent 231 fluoroscopy-guided balloon dilatation procedures, Dr. Bruckner noted that strictures were most commonly located in the proximal part of the esophagus, with a median distance of 13 cm down from the lips (J Pediatr Gastroenterol Nutr. 2018;67[6]:701-5).
The retrospective chart review reported by Dr. Bruckner showed that there were a median of seven dilatation procedures per patient, and 20 patients had repeated procedures at a median interval of 164 days. About 10% of procedures resulted in adverse events – mostly vomiting, pain, and fever – but there were no perforations or other serious effects, and the rate of subsequent hospitalization was 6.9%.
Dysphagia
Dysphagia was the predominant symptom caused by esophageal stricture in another dataset reported in a poster by Elena Pope, MD, MSc, of the Hospital for Sick Children at the University of Toronto, and colleagues.
Of 125 EB patients who had experienced at least 1 esophageal stricture episode, 497 esophageal stricture events were reported, and 85.5% of patients had difficulty swallowing at presentation, with 29.8% unable to swallow solids and 7.2% unable to swallow liquids. Other symptoms at presentation were painful swallowing (11%), food being stuck in the esophagus (8%), regurgitation (5%), coughing (4.8%), and dyspepsia (2.8%).
The aim of the retrospective, multicenter cohort study was to determine the prevalence of, and predisposing factors for, restenosis of esophageal strictures and factors that may predispose to restenosis. The study population consisted of 66 men and 59 women who had experienced their esophageal stricture at around ages 12-13 years. The majority (98.4%) had dystrophic EB, of which almost half (46.5%) had GS-RDEB.
The researchers found that the location of the esophageal stricture was important for restenosis, and that strictures occurring in the lower esophagus were 67.5% less likely to result in restenosis than if they occurred in the upper esophagus (P = .057; hazard ratio, 0.675).
A higher number of strictures was associated with a higher rate of restenosis, they reported. Indeed, patients who had two esophageal strictures had a 29.4% increased risk of restenosis, compared with those who had just one stricture (P = .038; HR, 1.294), and those with three or more strictures had an increased risk of 78.5%, compared with those having one stricture (P = .005; HR, 1.785).
Strictures longer than 1 cm also were associated with a greater (34.7%) risk of restenosis, compared with shorter strictures (P = .032; HR, 1.347). Various methods of resolving the stricture were used, from fluoroscopy-guided balloon dilatation to retro- or antegrade endoscopy. “Irrespective of method, dilatations are successful,” Dr. Pope and colleagues reported. The overall success of dilatation was 99.3%, with full dilatation achieved in almost all of the patients (96%). Of note is that there was a low risk (2.6%) of complications, they observed.
Medications were used in 46.8% of the patients, with the most popular choice being corticosteroids (90.3%), but the researchers noted that the “potential benefit of periprocedural corticosteroids use in decreasing the risk of restenosis needs further exploration.”
Dr. Bruckner had noted in her presentation that her group did not favor the use of periprocedural corticosteroids, but that antifibrotic therapy “could be attractive” for preventing future strictures.
Dr. Prodinger, Dr. Pope, and their colleagues did not provide disclosure information. Dr. Bruckner is the principal investigator for the Epidermolysis Bullosa Clinical Characterization and Outcomes Database. She disclosed the receipt of grants or research funding, honoraria, or consultation fees from a number of drug companies, as well as other support from the EB Research Partnership and the EB Medical Research Foundation.
SOURCES: Prodinger et al. EB 2020. Poster 3; Bruckner A et al. Pediatr Gastroenterol Nutr. 2018;67(6):701-5; Pope et al. EB 2020. Poster 8.
REPORTING FROM EB 2020
SCC survival remains poor in epidermolysis bullosa
LONDON – Median survival among patients with generalized severe recessive dystrophic epidermolysis bullosa (RDEB-GS) after a first diagnosis of mucocutaneous squamous cell carcinoma (SCC) was 2.4 years in an observational, retrospective study.
The study, conducted at St. Thomas’ Hospital and Great Ormond Street Hospital in London, was a review of all individuals with EB who had developed the skin cancer over a 28-year period, from 1991 to 2019.
A total of 44 subjects were identified who together had 221 primary SCCs. Considering all study subjects, the median age at first diagnosis of SCC was 32.6 years, with a mean of five tumors present. Almost 40% had metastatic tumors, and of the 57% who died during the observation period, 88% of deaths were attributable to the SCC.
“EB-associated SCCs differ from those in the general population,” the study’s investigators wrote in a poster presented at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (debra). “They affect a younger age group, and there are often multiple primaries,” they added. Furthermore, “they behave aggressively and metastasize early despite being well differentiated.”
Most (31) of the study participants had RDEB-GS and tended to develop their first SCC at a younger age than the group overall, at a median of 29.5 years (compared with 32.6 years for the overall group). The mean number of tumors was 5.8 among those with RDEB-GS, with over half (53.4%) of the SCCs being well differentiated and located on the hands, upper arms, feet, and lower legs. Median survival after a first diagnosis in this group was 2.4 years. The short survival after a first diagnosis of SCC “underscores the poor prognosis in this group,” the researchers wrote.
“As the largest cohort of EB SCC patients with comprehensive data regarding clinical course and management to date, our data reinforce the need for regular clinical surveillance for SCCs in EB patients,” the team concluded. This surveillance should start in adolescence for those with the severe generalized RDEB subtype, they advise, and from the third or fourth decade for other at-risk groups.
These data also highlight “the pressing need for more effective treatments,” the investigators wrote. Most (86.4%) of the SCCs among the patients in the study had been surgically removed by wide local excision, with a few patients undergoing lymph node dissection, radiotherapy, chemotherapy, electrochemotherapy, or receiving targeted cancer therapies such as erlotinib, cetuximab, or cemiplimab.
Surgery may not be an option for many patients, Jemima Mellerio, MD explained in an oral presentation at the meeting. Dr. Mellerio, a consultant dermatologist and chief of St John’s Institute of Dermatology at Guy’s & St. Thomas’ NHS Foundation, London, noted that the location of the tumor was important, as sometimes it was not physically possible to excise it completely.
Guidelines on how to manage SCCs in patients with EB were published a few years ago (Br J Dermatol. 2016;174:56-67) and noted that the clinical detection of SCCs could be difficult because of chronic wound ulceration in these patients. The “possibility of malignancy should be borne in mind, with suspicious lesions biopsied for histological evaluation,” the document states. Evidence for many of the nonsurgical options – radiotherapy, conventional chemotherapy, biologic therapies – was poor, according to the guidelines, and effective nonsurgical options are still desperately needed.
Several avenues of research are being investigated, Dr. Mellerio noted, such as targeting the fibrotic process and perhaps using a micro-RNA inhibitor to stop the upregulation of certain microRNAs in fibroblasts. Targeting inflammatory mechanisms such as thrombospondin 1, which can lead to elevated levels of tumor necrosis factor–beta and contribute to extracellular matrix stiffness, also is under investigation. Raised interleukin-6 may be another target to consider.
Research shows that similar genes are mutated in EB-related and ultraviolet-related SCCs, Dr. Mellerio said. Indeed, mutations in HRAS, NOTCH1, TP53, and CDKN2A have been reported, but mutations in these genes occur much earlier in life in patients with EB. “Something else is going on,” she added, commenting that researchers are looking at apolipoprotein B editing complex (APOBEC) enzymes, which modulate DNA and can cause “particular types of genetic changes in EB cancers.”
One investigator who is studying the genetics of EB SCCs and how APOBEC enzymes might be involved is Andrew South, PhD, an associate professor at Thomas Jefferson University, Philadelphia. APOBEC enzymes are a very prominent source of mutations in RDEB. These mutations are found in 10%-20% of squamous cell carcinomas not associated with RDEB, and 80%-90% of head and neck cancers, he said during a separate talk at the meeting.
Dr. South observed that “RDEB squamous cell carcinoma does not show any particular somatic mutation or upregulation or downregulation of genes that differentiates it from other squamous cell carcinomas, which might be disappointing on the front of it, but actually it does mean that precision therapies that have been developed for other squamous cell carcinomas have application in RDEB.”
RDEB SCC shows the greatest similarity with head and neck SCC, Dr. South said. He also stressed that fibrosis is a major driver of cancer development, SCC tumors in RDEB are homogenous, and that frontline therapy is still unclear.
What is clear, however, is that interdisciplinary management of patients is crucial, said Leena Bruckner-Tuderman, MD, professor and chair of the department of dermatology at the University Medical Center, Albert Ludwig University of Freiburg, Germany.
“In severe RDEB, metastatic SCC is the leading cause of death at a young age. We need monitoring, careful diagnostics, and multidisciplinary treatment,” Dr. Bruckner-Tuderman said. The latter should be delivered by a coordinated team that consists of dermatologists, surgeons, radiologists, oncologists, pathologists, geneticists, and (molecular) tumor boards, she advised.
The study had no commercial funding. Dr. Mellerio disclosed financial relationships with Castle Creek Pharmaceuticals and ProQR Therapeutics, and acted as an unpaid advisor to Helpberby Therapeutics. Dr. South disclosed financial relationships with Krystal Biotech Inc. and Amryt Genetics and has been an advisory board member for Abeona Therapeutics and Sanofi Genzyme. Dr. Bruckner-Tuderman disclosed receiving grants or research support from Constant Pharmaceuticals/Tarix Orphan.
LONDON – Median survival among patients with generalized severe recessive dystrophic epidermolysis bullosa (RDEB-GS) after a first diagnosis of mucocutaneous squamous cell carcinoma (SCC) was 2.4 years in an observational, retrospective study.
The study, conducted at St. Thomas’ Hospital and Great Ormond Street Hospital in London, was a review of all individuals with EB who had developed the skin cancer over a 28-year period, from 1991 to 2019.
A total of 44 subjects were identified who together had 221 primary SCCs. Considering all study subjects, the median age at first diagnosis of SCC was 32.6 years, with a mean of five tumors present. Almost 40% had metastatic tumors, and of the 57% who died during the observation period, 88% of deaths were attributable to the SCC.
“EB-associated SCCs differ from those in the general population,” the study’s investigators wrote in a poster presented at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (debra). “They affect a younger age group, and there are often multiple primaries,” they added. Furthermore, “they behave aggressively and metastasize early despite being well differentiated.”
Most (31) of the study participants had RDEB-GS and tended to develop their first SCC at a younger age than the group overall, at a median of 29.5 years (compared with 32.6 years for the overall group). The mean number of tumors was 5.8 among those with RDEB-GS, with over half (53.4%) of the SCCs being well differentiated and located on the hands, upper arms, feet, and lower legs. Median survival after a first diagnosis in this group was 2.4 years. The short survival after a first diagnosis of SCC “underscores the poor prognosis in this group,” the researchers wrote.
“As the largest cohort of EB SCC patients with comprehensive data regarding clinical course and management to date, our data reinforce the need for regular clinical surveillance for SCCs in EB patients,” the team concluded. This surveillance should start in adolescence for those with the severe generalized RDEB subtype, they advise, and from the third or fourth decade for other at-risk groups.
These data also highlight “the pressing need for more effective treatments,” the investigators wrote. Most (86.4%) of the SCCs among the patients in the study had been surgically removed by wide local excision, with a few patients undergoing lymph node dissection, radiotherapy, chemotherapy, electrochemotherapy, or receiving targeted cancer therapies such as erlotinib, cetuximab, or cemiplimab.
Surgery may not be an option for many patients, Jemima Mellerio, MD explained in an oral presentation at the meeting. Dr. Mellerio, a consultant dermatologist and chief of St John’s Institute of Dermatology at Guy’s & St. Thomas’ NHS Foundation, London, noted that the location of the tumor was important, as sometimes it was not physically possible to excise it completely.
Guidelines on how to manage SCCs in patients with EB were published a few years ago (Br J Dermatol. 2016;174:56-67) and noted that the clinical detection of SCCs could be difficult because of chronic wound ulceration in these patients. The “possibility of malignancy should be borne in mind, with suspicious lesions biopsied for histological evaluation,” the document states. Evidence for many of the nonsurgical options – radiotherapy, conventional chemotherapy, biologic therapies – was poor, according to the guidelines, and effective nonsurgical options are still desperately needed.
Several avenues of research are being investigated, Dr. Mellerio noted, such as targeting the fibrotic process and perhaps using a micro-RNA inhibitor to stop the upregulation of certain microRNAs in fibroblasts. Targeting inflammatory mechanisms such as thrombospondin 1, which can lead to elevated levels of tumor necrosis factor–beta and contribute to extracellular matrix stiffness, also is under investigation. Raised interleukin-6 may be another target to consider.
Research shows that similar genes are mutated in EB-related and ultraviolet-related SCCs, Dr. Mellerio said. Indeed, mutations in HRAS, NOTCH1, TP53, and CDKN2A have been reported, but mutations in these genes occur much earlier in life in patients with EB. “Something else is going on,” she added, commenting that researchers are looking at apolipoprotein B editing complex (APOBEC) enzymes, which modulate DNA and can cause “particular types of genetic changes in EB cancers.”
One investigator who is studying the genetics of EB SCCs and how APOBEC enzymes might be involved is Andrew South, PhD, an associate professor at Thomas Jefferson University, Philadelphia. APOBEC enzymes are a very prominent source of mutations in RDEB. These mutations are found in 10%-20% of squamous cell carcinomas not associated with RDEB, and 80%-90% of head and neck cancers, he said during a separate talk at the meeting.
Dr. South observed that “RDEB squamous cell carcinoma does not show any particular somatic mutation or upregulation or downregulation of genes that differentiates it from other squamous cell carcinomas, which might be disappointing on the front of it, but actually it does mean that precision therapies that have been developed for other squamous cell carcinomas have application in RDEB.”
RDEB SCC shows the greatest similarity with head and neck SCC, Dr. South said. He also stressed that fibrosis is a major driver of cancer development, SCC tumors in RDEB are homogenous, and that frontline therapy is still unclear.
What is clear, however, is that interdisciplinary management of patients is crucial, said Leena Bruckner-Tuderman, MD, professor and chair of the department of dermatology at the University Medical Center, Albert Ludwig University of Freiburg, Germany.
“In severe RDEB, metastatic SCC is the leading cause of death at a young age. We need monitoring, careful diagnostics, and multidisciplinary treatment,” Dr. Bruckner-Tuderman said. The latter should be delivered by a coordinated team that consists of dermatologists, surgeons, radiologists, oncologists, pathologists, geneticists, and (molecular) tumor boards, she advised.
The study had no commercial funding. Dr. Mellerio disclosed financial relationships with Castle Creek Pharmaceuticals and ProQR Therapeutics, and acted as an unpaid advisor to Helpberby Therapeutics. Dr. South disclosed financial relationships with Krystal Biotech Inc. and Amryt Genetics and has been an advisory board member for Abeona Therapeutics and Sanofi Genzyme. Dr. Bruckner-Tuderman disclosed receiving grants or research support from Constant Pharmaceuticals/Tarix Orphan.
LONDON – Median survival among patients with generalized severe recessive dystrophic epidermolysis bullosa (RDEB-GS) after a first diagnosis of mucocutaneous squamous cell carcinoma (SCC) was 2.4 years in an observational, retrospective study.
The study, conducted at St. Thomas’ Hospital and Great Ormond Street Hospital in London, was a review of all individuals with EB who had developed the skin cancer over a 28-year period, from 1991 to 2019.
A total of 44 subjects were identified who together had 221 primary SCCs. Considering all study subjects, the median age at first diagnosis of SCC was 32.6 years, with a mean of five tumors present. Almost 40% had metastatic tumors, and of the 57% who died during the observation period, 88% of deaths were attributable to the SCC.
“EB-associated SCCs differ from those in the general population,” the study’s investigators wrote in a poster presented at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (debra). “They affect a younger age group, and there are often multiple primaries,” they added. Furthermore, “they behave aggressively and metastasize early despite being well differentiated.”
Most (31) of the study participants had RDEB-GS and tended to develop their first SCC at a younger age than the group overall, at a median of 29.5 years (compared with 32.6 years for the overall group). The mean number of tumors was 5.8 among those with RDEB-GS, with over half (53.4%) of the SCCs being well differentiated and located on the hands, upper arms, feet, and lower legs. Median survival after a first diagnosis in this group was 2.4 years. The short survival after a first diagnosis of SCC “underscores the poor prognosis in this group,” the researchers wrote.
“As the largest cohort of EB SCC patients with comprehensive data regarding clinical course and management to date, our data reinforce the need for regular clinical surveillance for SCCs in EB patients,” the team concluded. This surveillance should start in adolescence for those with the severe generalized RDEB subtype, they advise, and from the third or fourth decade for other at-risk groups.
These data also highlight “the pressing need for more effective treatments,” the investigators wrote. Most (86.4%) of the SCCs among the patients in the study had been surgically removed by wide local excision, with a few patients undergoing lymph node dissection, radiotherapy, chemotherapy, electrochemotherapy, or receiving targeted cancer therapies such as erlotinib, cetuximab, or cemiplimab.
Surgery may not be an option for many patients, Jemima Mellerio, MD explained in an oral presentation at the meeting. Dr. Mellerio, a consultant dermatologist and chief of St John’s Institute of Dermatology at Guy’s & St. Thomas’ NHS Foundation, London, noted that the location of the tumor was important, as sometimes it was not physically possible to excise it completely.
Guidelines on how to manage SCCs in patients with EB were published a few years ago (Br J Dermatol. 2016;174:56-67) and noted that the clinical detection of SCCs could be difficult because of chronic wound ulceration in these patients. The “possibility of malignancy should be borne in mind, with suspicious lesions biopsied for histological evaluation,” the document states. Evidence for many of the nonsurgical options – radiotherapy, conventional chemotherapy, biologic therapies – was poor, according to the guidelines, and effective nonsurgical options are still desperately needed.
Several avenues of research are being investigated, Dr. Mellerio noted, such as targeting the fibrotic process and perhaps using a micro-RNA inhibitor to stop the upregulation of certain microRNAs in fibroblasts. Targeting inflammatory mechanisms such as thrombospondin 1, which can lead to elevated levels of tumor necrosis factor–beta and contribute to extracellular matrix stiffness, also is under investigation. Raised interleukin-6 may be another target to consider.
Research shows that similar genes are mutated in EB-related and ultraviolet-related SCCs, Dr. Mellerio said. Indeed, mutations in HRAS, NOTCH1, TP53, and CDKN2A have been reported, but mutations in these genes occur much earlier in life in patients with EB. “Something else is going on,” she added, commenting that researchers are looking at apolipoprotein B editing complex (APOBEC) enzymes, which modulate DNA and can cause “particular types of genetic changes in EB cancers.”
One investigator who is studying the genetics of EB SCCs and how APOBEC enzymes might be involved is Andrew South, PhD, an associate professor at Thomas Jefferson University, Philadelphia. APOBEC enzymes are a very prominent source of mutations in RDEB. These mutations are found in 10%-20% of squamous cell carcinomas not associated with RDEB, and 80%-90% of head and neck cancers, he said during a separate talk at the meeting.
Dr. South observed that “RDEB squamous cell carcinoma does not show any particular somatic mutation or upregulation or downregulation of genes that differentiates it from other squamous cell carcinomas, which might be disappointing on the front of it, but actually it does mean that precision therapies that have been developed for other squamous cell carcinomas have application in RDEB.”
RDEB SCC shows the greatest similarity with head and neck SCC, Dr. South said. He also stressed that fibrosis is a major driver of cancer development, SCC tumors in RDEB are homogenous, and that frontline therapy is still unclear.
What is clear, however, is that interdisciplinary management of patients is crucial, said Leena Bruckner-Tuderman, MD, professor and chair of the department of dermatology at the University Medical Center, Albert Ludwig University of Freiburg, Germany.
“In severe RDEB, metastatic SCC is the leading cause of death at a young age. We need monitoring, careful diagnostics, and multidisciplinary treatment,” Dr. Bruckner-Tuderman said. The latter should be delivered by a coordinated team that consists of dermatologists, surgeons, radiologists, oncologists, pathologists, geneticists, and (molecular) tumor boards, she advised.
The study had no commercial funding. Dr. Mellerio disclosed financial relationships with Castle Creek Pharmaceuticals and ProQR Therapeutics, and acted as an unpaid advisor to Helpberby Therapeutics. Dr. South disclosed financial relationships with Krystal Biotech Inc. and Amryt Genetics and has been an advisory board member for Abeona Therapeutics and Sanofi Genzyme. Dr. Bruckner-Tuderman disclosed receiving grants or research support from Constant Pharmaceuticals/Tarix Orphan.
REPORTING FROM EB 2020
Prioritize oral health in children with DEB
LONDON – , pediatric dentist Susanne Krämer told attendees at the first EB World Congress.
While it may not be the first thing on the minds of families coming to terms with their children having a chronic and potentially debilitating skin disease, it is important to consider oral health early to ensure healthy dentition and mouth function, both of which will affect the ability to eat and thus nutrition.
When there are a lot of other health issues, “dentistry is not a priority,” Dr. Krämer acknowledged in an interview at the meeting, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA).
Something as simple as brushing teeth can be very distressing for parents of a child with EB, she observed, especially if there is dysphagia and toothpaste may be getting into the airways accidentally.
Oral health was one of the topics that patients with EB and their families said would be good to have some guidance on when they were surveyed by DEBRA International. This led the charity to develop its first clinical practice guideline in 2012. Dr. Krämer was the lead author of the guidelines, which are about to be updated and republished.
The “Oral Health for Patients with Epidermolysis Bullosa – Best Clinical Practice Guidelines” (Int J Paediatr Dent. 2012;22 Suppl 1:1-35) are in the final stages of being revised, said Dr. Krämer, who is head of the department of pediatric dentistry at the University of Chile in Santiago. Although there is not much new evidence since the guidelines were first published, “we do have a lot of new technologies within dentistry that can aid the care of EB,” she said.
An important addition to the upcoming 2020 guidelines is a chapter on the patient-clinician partnership. This was added because “you can have fantastic technologies, but if you don’t have a confident relationship with the family and the patient, you won’t be able to proceed.” Dr. Krämer explained: “Patients with EB are so fragile and so afraid of being hurt that they won’t open their mouth unless there is a confidence with the clinician and they trust [him or her]; once they trust, they [will] open the mouth and you can work.”
Dr. Krämer noted that timing of the first dental appointment will depend on the referral pathway for every country and then every service. In her specialist practice the aim is to see newly diagnosed babies before the age of 3 months. “Lots of people would argue they don’t have teeth, but I need to educate the families on several aspects of oral health from early on.”
Older patients with EB may be more aware of the importance of a healthy mouth from a functional point of view and the need to eat and swallow normally, Dr. Krämer said, adding that the “social aspects of having a healthy smile are very important as well.”
Oral care in EB has come a long way since the 1970s when teeth extraction was recommended as the primary dental treatment option. “If you refer to literature in the 90s, that said we can actually restore the teeth in the patients with EB, and what we are now saying is that we have to prevent oral disease,” Dr. Krämer said.
Can oral disease be prevented completely? Yes, she said, but only in a few patients. “We still have decay in a lot of our patients, but far less than what we have had before. It will depend on the compliance of the family and the patient,” Dr. Krämer noted.
Compliance also is a factor in improving mouth function after surgery, which may be done to prevent the tongue from fusing to the bottom of the mouth and to relieve or prevent microstomia, which limits mouth opening.
“We are doing a lot of surgeries to release the fibrotic scars ... we have done it in both children and adults, but there have been better results in adults, because they are able to comply with the course of exercises” after surgery, Dr. Krämer said.
Results of an as-yet unpublished randomized controlled trial of postoperative mouth exercises demonstrate that patients who did the exercises, which involved using a device to stretch the mouth three times a day for 3 months, saw improvements in mouth opening. Once they stopped doing the exercises, however, these improvements faded. Considering the time spent on dressing changes and other exercises, this is perhaps understandable, she acknowledged.
Prevention, education, continual follow-up, and early referral are key to good oral health, Dr. Krämer emphasized. “If there is patient-clinician partnership confidence, they can have regular checkups with dental cleaning, with a fluoride varnish, different preventive strategies so they do not need to get to the point where they need general anesthesia or extractions.” Extractions still will be done, she added, but more for orthodontic reasons, because the teeth do not fit in the mouth. “That is our ideal world, that is where we want to go.”
LONDON – , pediatric dentist Susanne Krämer told attendees at the first EB World Congress.
While it may not be the first thing on the minds of families coming to terms with their children having a chronic and potentially debilitating skin disease, it is important to consider oral health early to ensure healthy dentition and mouth function, both of which will affect the ability to eat and thus nutrition.
When there are a lot of other health issues, “dentistry is not a priority,” Dr. Krämer acknowledged in an interview at the meeting, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA).
Something as simple as brushing teeth can be very distressing for parents of a child with EB, she observed, especially if there is dysphagia and toothpaste may be getting into the airways accidentally.
Oral health was one of the topics that patients with EB and their families said would be good to have some guidance on when they were surveyed by DEBRA International. This led the charity to develop its first clinical practice guideline in 2012. Dr. Krämer was the lead author of the guidelines, which are about to be updated and republished.
The “Oral Health for Patients with Epidermolysis Bullosa – Best Clinical Practice Guidelines” (Int J Paediatr Dent. 2012;22 Suppl 1:1-35) are in the final stages of being revised, said Dr. Krämer, who is head of the department of pediatric dentistry at the University of Chile in Santiago. Although there is not much new evidence since the guidelines were first published, “we do have a lot of new technologies within dentistry that can aid the care of EB,” she said.
An important addition to the upcoming 2020 guidelines is a chapter on the patient-clinician partnership. This was added because “you can have fantastic technologies, but if you don’t have a confident relationship with the family and the patient, you won’t be able to proceed.” Dr. Krämer explained: “Patients with EB are so fragile and so afraid of being hurt that they won’t open their mouth unless there is a confidence with the clinician and they trust [him or her]; once they trust, they [will] open the mouth and you can work.”
Dr. Krämer noted that timing of the first dental appointment will depend on the referral pathway for every country and then every service. In her specialist practice the aim is to see newly diagnosed babies before the age of 3 months. “Lots of people would argue they don’t have teeth, but I need to educate the families on several aspects of oral health from early on.”
Older patients with EB may be more aware of the importance of a healthy mouth from a functional point of view and the need to eat and swallow normally, Dr. Krämer said, adding that the “social aspects of having a healthy smile are very important as well.”
Oral care in EB has come a long way since the 1970s when teeth extraction was recommended as the primary dental treatment option. “If you refer to literature in the 90s, that said we can actually restore the teeth in the patients with EB, and what we are now saying is that we have to prevent oral disease,” Dr. Krämer said.
Can oral disease be prevented completely? Yes, she said, but only in a few patients. “We still have decay in a lot of our patients, but far less than what we have had before. It will depend on the compliance of the family and the patient,” Dr. Krämer noted.
Compliance also is a factor in improving mouth function after surgery, which may be done to prevent the tongue from fusing to the bottom of the mouth and to relieve or prevent microstomia, which limits mouth opening.
“We are doing a lot of surgeries to release the fibrotic scars ... we have done it in both children and adults, but there have been better results in adults, because they are able to comply with the course of exercises” after surgery, Dr. Krämer said.
Results of an as-yet unpublished randomized controlled trial of postoperative mouth exercises demonstrate that patients who did the exercises, which involved using a device to stretch the mouth three times a day for 3 months, saw improvements in mouth opening. Once they stopped doing the exercises, however, these improvements faded. Considering the time spent on dressing changes and other exercises, this is perhaps understandable, she acknowledged.
Prevention, education, continual follow-up, and early referral are key to good oral health, Dr. Krämer emphasized. “If there is patient-clinician partnership confidence, they can have regular checkups with dental cleaning, with a fluoride varnish, different preventive strategies so they do not need to get to the point where they need general anesthesia or extractions.” Extractions still will be done, she added, but more for orthodontic reasons, because the teeth do not fit in the mouth. “That is our ideal world, that is where we want to go.”
LONDON – , pediatric dentist Susanne Krämer told attendees at the first EB World Congress.
While it may not be the first thing on the minds of families coming to terms with their children having a chronic and potentially debilitating skin disease, it is important to consider oral health early to ensure healthy dentition and mouth function, both of which will affect the ability to eat and thus nutrition.
When there are a lot of other health issues, “dentistry is not a priority,” Dr. Krämer acknowledged in an interview at the meeting, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA).
Something as simple as brushing teeth can be very distressing for parents of a child with EB, she observed, especially if there is dysphagia and toothpaste may be getting into the airways accidentally.
Oral health was one of the topics that patients with EB and their families said would be good to have some guidance on when they were surveyed by DEBRA International. This led the charity to develop its first clinical practice guideline in 2012. Dr. Krämer was the lead author of the guidelines, which are about to be updated and republished.
The “Oral Health for Patients with Epidermolysis Bullosa – Best Clinical Practice Guidelines” (Int J Paediatr Dent. 2012;22 Suppl 1:1-35) are in the final stages of being revised, said Dr. Krämer, who is head of the department of pediatric dentistry at the University of Chile in Santiago. Although there is not much new evidence since the guidelines were first published, “we do have a lot of new technologies within dentistry that can aid the care of EB,” she said.
An important addition to the upcoming 2020 guidelines is a chapter on the patient-clinician partnership. This was added because “you can have fantastic technologies, but if you don’t have a confident relationship with the family and the patient, you won’t be able to proceed.” Dr. Krämer explained: “Patients with EB are so fragile and so afraid of being hurt that they won’t open their mouth unless there is a confidence with the clinician and they trust [him or her]; once they trust, they [will] open the mouth and you can work.”
Dr. Krämer noted that timing of the first dental appointment will depend on the referral pathway for every country and then every service. In her specialist practice the aim is to see newly diagnosed babies before the age of 3 months. “Lots of people would argue they don’t have teeth, but I need to educate the families on several aspects of oral health from early on.”
Older patients with EB may be more aware of the importance of a healthy mouth from a functional point of view and the need to eat and swallow normally, Dr. Krämer said, adding that the “social aspects of having a healthy smile are very important as well.”
Oral care in EB has come a long way since the 1970s when teeth extraction was recommended as the primary dental treatment option. “If you refer to literature in the 90s, that said we can actually restore the teeth in the patients with EB, and what we are now saying is that we have to prevent oral disease,” Dr. Krämer said.
Can oral disease be prevented completely? Yes, she said, but only in a few patients. “We still have decay in a lot of our patients, but far less than what we have had before. It will depend on the compliance of the family and the patient,” Dr. Krämer noted.
Compliance also is a factor in improving mouth function after surgery, which may be done to prevent the tongue from fusing to the bottom of the mouth and to relieve or prevent microstomia, which limits mouth opening.
“We are doing a lot of surgeries to release the fibrotic scars ... we have done it in both children and adults, but there have been better results in adults, because they are able to comply with the course of exercises” after surgery, Dr. Krämer said.
Results of an as-yet unpublished randomized controlled trial of postoperative mouth exercises demonstrate that patients who did the exercises, which involved using a device to stretch the mouth three times a day for 3 months, saw improvements in mouth opening. Once they stopped doing the exercises, however, these improvements faded. Considering the time spent on dressing changes and other exercises, this is perhaps understandable, she acknowledged.
Prevention, education, continual follow-up, and early referral are key to good oral health, Dr. Krämer emphasized. “If there is patient-clinician partnership confidence, they can have regular checkups with dental cleaning, with a fluoride varnish, different preventive strategies so they do not need to get to the point where they need general anesthesia or extractions.” Extractions still will be done, she added, but more for orthodontic reasons, because the teeth do not fit in the mouth. “That is our ideal world, that is where we want to go.”
REPORTING FROM EB 2020
Target plantar keratoderma when managing ‘mild’ EBS
LONDON – Hardened feet are a major determinant of the clinical course of epidermolysis bullosa simplex (EBS), according to research presented by a German team of investigators at the EB World Congress.
In a study of 157 individuals with EBS, 75.8% had plantar keratoderma, a condition associated with a vicious circle of pain, reduced mobility, subsequent weight gain, and further foot problems.
“EBS has severe impacts on various aspects of everyday life,” Antonia Reimer, MD, and associates at the University of Freiburg, Germany, reported in a poster presentation. “Plantar involvement and [plantar keratoderma] are serious complications of all EBS subtypes, correlating with excessive weight gain, pain, local infections, and limited mobility.”
The researchers suggested that “targeting [plantar keratoderma] should be a priority in EBS therapy and research.”
In their retrospective cohort study, clinical and molecular data were retrieved from patient records, and major determinants of the clinical course of EBS investigated. As such, the researchers looked at how weight changes affected EBS, the effect of hardening skin on the feet, pain, mobility, and working life.
“EB simplex is generally regarded as the ‘mildest’ EB type,” Dr. Reimer and colleagues wrote, “however, individuals with EBS report a high disease burden and frequent pain.” The team found that just under 30% of patients (n = 46) experienced frequent pain, particularly those with localized and severe EBS. Of the patients experiencing pain, the majority (75.2%) had plantar keratoderma. Furthermore, those with blisters underneath the hardened skin reported having the most painful lesions.
Palmoplantar hyperhidrosis was present in slightly more than 40% of cases, and was especially common in individuals with localized EBS, Dr. Reimer and colleagues found. They also found that bacterial and fungal infections occurred in 14% and 7% of patients, respectively, and this correlated significantly with diffuse plantar keratoderma.
A third of patients experience mobility problems, and 8.2% required a wheelchair; 16.4% “were in occupational disability,” the team reported.
“Hyperkeratosis is important because it isn’t just about treating the hyperkeratosis, it’s also looking at the mechanical balance of the foot,” Tariq Khan, PhD, said during an unrelated oral presentation. Dr. Khan, a consultant podiatrist specializing in EB at Great Ormond Street Hospital NHS Foundation Trust in London, discussed how to best manage the feet of people with EB.
“Podiatry technology and how we treat can often be detrimental to an EB patient,” Dr. Khan cautioned at the meeting, which was organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA).
For example, “certain devices, certain types of material, will add more friction and pressure and cause more blistering,” he added, making treatment challenging.
Having worked with the EB community for the past 22 years, he noted that he had seen how podiatry practices had been refined to deal with this patient population. Dr. Khan is one of several experts behind EB podiatry guidelines issued by DEBRA International last year (Br J Dermatol. 2019 Aug 9. doi: 10.1111/bjd.18381) and has run the charity’s first practical EB podiatry skills course to educate more podiatrists on the intricacies of managing EB feet.
During his talk, Dr. Kahn mentioned several innovations that came about by working with external companies, such as the production of special cotton socks containing silver fibers to help reduce the symptom of hot feet, and development of a cooling insole that helped draw moisture and odor away from the foot while providing comfort to the wearer.
One of the main problems for those with EB is finding comfortable footwear that doesn’t aggravate their symptoms, Dr. Khan emphasized.
According to the EB podiatry guidelines, footwear needs to be supportive, and “its primary focus should be aimed at minimizing blistering by reducing friction.” If blisters are already present, the guidelines note that dressings and topical antiseptics or antibiotics might be used until the blisters heal. “Therefore, suitable shoes or footwear are essential to accommodate dressings and not lead to further trauma to the damaged area. Footwear that is adjustable may be beneficial in these circumstances.”
What constitutes appropriate footwear is open to debate and was the topic of a separate poster presentation at meeting. Mark O’Sullivan, EB team podiatrist at Solihull and Birmingham Women’s and Children’s NHS Foundation Trust, and associates looked at whether wearing rocker bottom footwear could ease the formation of blisters in patients with EBS.
The team studied nine patients who reported regular plantar blistering. An in-shoe measurement system was devised to measure patients’ plantar pressure while they were wearing their existing footwear and then again when they were wearing new footwear with a rocker bottom. Participants completed questionnaires about the development of blisters on their feet, their activity levels, and pain.
The rocker bottom footwear reduced the peak plantar pressure by 30.5% and the total plantar pressure by 31.8%, compared with regular footwear. A shift in the average pressure under the foot was seen, moving from the heels of the feet to the midfoot area, while remaining similar in the front foot area.
“Patient feedback has been mixed,” Mr. O’Sullivan said when presenting the poster. “Patients state that blisters have often reduced in the heels and forefoot, but new blisters have developed in the midfoot.” As a result, some study participants chose to alternate wearing the rocker bottom footwear with their normal shoes, to even out the places where blisters might form.
Although the jury is still out on the benefit of rocker bottom footwear, one thing that might help those with EBS who develop regular foot blisters may be to keep their weight in check. In a separate poster presentation given by Lynn Hubbard, a specialist EB dietitian in the department of nutrition and dietetics at St. Thomas’ Hospital in London, it was shown that almost a third of patients with EB simplex were obese, compared with 26% of adults in the general U.K. population.
“People with EBS are known to have hyperkeratosis and foot-blistering,” Ms. Hubbard observed in the poster. This can lead to reduce mobility and pain, which “may in turn have an impact on body weight, and an increased BMI [body mass index] may further affect mobility.”
Data were collected on 90 patients who attended a U.K. EBS clinic over an 11-month period. While 45.5% of patients had a normal weight, the majority was overweight (21.1%), obese (21.1%), or morbidly obese (10%).
Fifteen patients completed questionnaires about their mobility, and almost all felt that their weight had an adverse effect on their feet, as did EBS. Several also noted problems with their EBS, in the skin folds around the bra, waist, and sock lines.
“We now plan to begin a pilot study to establish a supportive weight management program for people with EBS and evaluate both weight loss and impact on mobility,” Ms. Hubbard reported.
No conflicts of interest were declared by any of the speakers.
SOURCES: EB 2020. Reimer A et al. Poster 26; Khan T. oral presentation; O’Sullivan M et al. Poster 93; Hubbard L. Poster 19.
LONDON – Hardened feet are a major determinant of the clinical course of epidermolysis bullosa simplex (EBS), according to research presented by a German team of investigators at the EB World Congress.
In a study of 157 individuals with EBS, 75.8% had plantar keratoderma, a condition associated with a vicious circle of pain, reduced mobility, subsequent weight gain, and further foot problems.
“EBS has severe impacts on various aspects of everyday life,” Antonia Reimer, MD, and associates at the University of Freiburg, Germany, reported in a poster presentation. “Plantar involvement and [plantar keratoderma] are serious complications of all EBS subtypes, correlating with excessive weight gain, pain, local infections, and limited mobility.”
The researchers suggested that “targeting [plantar keratoderma] should be a priority in EBS therapy and research.”
In their retrospective cohort study, clinical and molecular data were retrieved from patient records, and major determinants of the clinical course of EBS investigated. As such, the researchers looked at how weight changes affected EBS, the effect of hardening skin on the feet, pain, mobility, and working life.
“EB simplex is generally regarded as the ‘mildest’ EB type,” Dr. Reimer and colleagues wrote, “however, individuals with EBS report a high disease burden and frequent pain.” The team found that just under 30% of patients (n = 46) experienced frequent pain, particularly those with localized and severe EBS. Of the patients experiencing pain, the majority (75.2%) had plantar keratoderma. Furthermore, those with blisters underneath the hardened skin reported having the most painful lesions.
Palmoplantar hyperhidrosis was present in slightly more than 40% of cases, and was especially common in individuals with localized EBS, Dr. Reimer and colleagues found. They also found that bacterial and fungal infections occurred in 14% and 7% of patients, respectively, and this correlated significantly with diffuse plantar keratoderma.
A third of patients experience mobility problems, and 8.2% required a wheelchair; 16.4% “were in occupational disability,” the team reported.
“Hyperkeratosis is important because it isn’t just about treating the hyperkeratosis, it’s also looking at the mechanical balance of the foot,” Tariq Khan, PhD, said during an unrelated oral presentation. Dr. Khan, a consultant podiatrist specializing in EB at Great Ormond Street Hospital NHS Foundation Trust in London, discussed how to best manage the feet of people with EB.
“Podiatry technology and how we treat can often be detrimental to an EB patient,” Dr. Khan cautioned at the meeting, which was organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA).
For example, “certain devices, certain types of material, will add more friction and pressure and cause more blistering,” he added, making treatment challenging.
Having worked with the EB community for the past 22 years, he noted that he had seen how podiatry practices had been refined to deal with this patient population. Dr. Khan is one of several experts behind EB podiatry guidelines issued by DEBRA International last year (Br J Dermatol. 2019 Aug 9. doi: 10.1111/bjd.18381) and has run the charity’s first practical EB podiatry skills course to educate more podiatrists on the intricacies of managing EB feet.
During his talk, Dr. Kahn mentioned several innovations that came about by working with external companies, such as the production of special cotton socks containing silver fibers to help reduce the symptom of hot feet, and development of a cooling insole that helped draw moisture and odor away from the foot while providing comfort to the wearer.
One of the main problems for those with EB is finding comfortable footwear that doesn’t aggravate their symptoms, Dr. Khan emphasized.
According to the EB podiatry guidelines, footwear needs to be supportive, and “its primary focus should be aimed at minimizing blistering by reducing friction.” If blisters are already present, the guidelines note that dressings and topical antiseptics or antibiotics might be used until the blisters heal. “Therefore, suitable shoes or footwear are essential to accommodate dressings and not lead to further trauma to the damaged area. Footwear that is adjustable may be beneficial in these circumstances.”
What constitutes appropriate footwear is open to debate and was the topic of a separate poster presentation at meeting. Mark O’Sullivan, EB team podiatrist at Solihull and Birmingham Women’s and Children’s NHS Foundation Trust, and associates looked at whether wearing rocker bottom footwear could ease the formation of blisters in patients with EBS.
The team studied nine patients who reported regular plantar blistering. An in-shoe measurement system was devised to measure patients’ plantar pressure while they were wearing their existing footwear and then again when they were wearing new footwear with a rocker bottom. Participants completed questionnaires about the development of blisters on their feet, their activity levels, and pain.
The rocker bottom footwear reduced the peak plantar pressure by 30.5% and the total plantar pressure by 31.8%, compared with regular footwear. A shift in the average pressure under the foot was seen, moving from the heels of the feet to the midfoot area, while remaining similar in the front foot area.
“Patient feedback has been mixed,” Mr. O’Sullivan said when presenting the poster. “Patients state that blisters have often reduced in the heels and forefoot, but new blisters have developed in the midfoot.” As a result, some study participants chose to alternate wearing the rocker bottom footwear with their normal shoes, to even out the places where blisters might form.
Although the jury is still out on the benefit of rocker bottom footwear, one thing that might help those with EBS who develop regular foot blisters may be to keep their weight in check. In a separate poster presentation given by Lynn Hubbard, a specialist EB dietitian in the department of nutrition and dietetics at St. Thomas’ Hospital in London, it was shown that almost a third of patients with EB simplex were obese, compared with 26% of adults in the general U.K. population.
“People with EBS are known to have hyperkeratosis and foot-blistering,” Ms. Hubbard observed in the poster. This can lead to reduce mobility and pain, which “may in turn have an impact on body weight, and an increased BMI [body mass index] may further affect mobility.”
Data were collected on 90 patients who attended a U.K. EBS clinic over an 11-month period. While 45.5% of patients had a normal weight, the majority was overweight (21.1%), obese (21.1%), or morbidly obese (10%).
Fifteen patients completed questionnaires about their mobility, and almost all felt that their weight had an adverse effect on their feet, as did EBS. Several also noted problems with their EBS, in the skin folds around the bra, waist, and sock lines.
“We now plan to begin a pilot study to establish a supportive weight management program for people with EBS and evaluate both weight loss and impact on mobility,” Ms. Hubbard reported.
No conflicts of interest were declared by any of the speakers.
SOURCES: EB 2020. Reimer A et al. Poster 26; Khan T. oral presentation; O’Sullivan M et al. Poster 93; Hubbard L. Poster 19.
LONDON – Hardened feet are a major determinant of the clinical course of epidermolysis bullosa simplex (EBS), according to research presented by a German team of investigators at the EB World Congress.
In a study of 157 individuals with EBS, 75.8% had plantar keratoderma, a condition associated with a vicious circle of pain, reduced mobility, subsequent weight gain, and further foot problems.
“EBS has severe impacts on various aspects of everyday life,” Antonia Reimer, MD, and associates at the University of Freiburg, Germany, reported in a poster presentation. “Plantar involvement and [plantar keratoderma] are serious complications of all EBS subtypes, correlating with excessive weight gain, pain, local infections, and limited mobility.”
The researchers suggested that “targeting [plantar keratoderma] should be a priority in EBS therapy and research.”
In their retrospective cohort study, clinical and molecular data were retrieved from patient records, and major determinants of the clinical course of EBS investigated. As such, the researchers looked at how weight changes affected EBS, the effect of hardening skin on the feet, pain, mobility, and working life.
“EB simplex is generally regarded as the ‘mildest’ EB type,” Dr. Reimer and colleagues wrote, “however, individuals with EBS report a high disease burden and frequent pain.” The team found that just under 30% of patients (n = 46) experienced frequent pain, particularly those with localized and severe EBS. Of the patients experiencing pain, the majority (75.2%) had plantar keratoderma. Furthermore, those with blisters underneath the hardened skin reported having the most painful lesions.
Palmoplantar hyperhidrosis was present in slightly more than 40% of cases, and was especially common in individuals with localized EBS, Dr. Reimer and colleagues found. They also found that bacterial and fungal infections occurred in 14% and 7% of patients, respectively, and this correlated significantly with diffuse plantar keratoderma.
A third of patients experience mobility problems, and 8.2% required a wheelchair; 16.4% “were in occupational disability,” the team reported.
“Hyperkeratosis is important because it isn’t just about treating the hyperkeratosis, it’s also looking at the mechanical balance of the foot,” Tariq Khan, PhD, said during an unrelated oral presentation. Dr. Khan, a consultant podiatrist specializing in EB at Great Ormond Street Hospital NHS Foundation Trust in London, discussed how to best manage the feet of people with EB.
“Podiatry technology and how we treat can often be detrimental to an EB patient,” Dr. Khan cautioned at the meeting, which was organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA).
For example, “certain devices, certain types of material, will add more friction and pressure and cause more blistering,” he added, making treatment challenging.
Having worked with the EB community for the past 22 years, he noted that he had seen how podiatry practices had been refined to deal with this patient population. Dr. Khan is one of several experts behind EB podiatry guidelines issued by DEBRA International last year (Br J Dermatol. 2019 Aug 9. doi: 10.1111/bjd.18381) and has run the charity’s first practical EB podiatry skills course to educate more podiatrists on the intricacies of managing EB feet.
During his talk, Dr. Kahn mentioned several innovations that came about by working with external companies, such as the production of special cotton socks containing silver fibers to help reduce the symptom of hot feet, and development of a cooling insole that helped draw moisture and odor away from the foot while providing comfort to the wearer.
One of the main problems for those with EB is finding comfortable footwear that doesn’t aggravate their symptoms, Dr. Khan emphasized.
According to the EB podiatry guidelines, footwear needs to be supportive, and “its primary focus should be aimed at minimizing blistering by reducing friction.” If blisters are already present, the guidelines note that dressings and topical antiseptics or antibiotics might be used until the blisters heal. “Therefore, suitable shoes or footwear are essential to accommodate dressings and not lead to further trauma to the damaged area. Footwear that is adjustable may be beneficial in these circumstances.”
What constitutes appropriate footwear is open to debate and was the topic of a separate poster presentation at meeting. Mark O’Sullivan, EB team podiatrist at Solihull and Birmingham Women’s and Children’s NHS Foundation Trust, and associates looked at whether wearing rocker bottom footwear could ease the formation of blisters in patients with EBS.
The team studied nine patients who reported regular plantar blistering. An in-shoe measurement system was devised to measure patients’ plantar pressure while they were wearing their existing footwear and then again when they were wearing new footwear with a rocker bottom. Participants completed questionnaires about the development of blisters on their feet, their activity levels, and pain.
The rocker bottom footwear reduced the peak plantar pressure by 30.5% and the total plantar pressure by 31.8%, compared with regular footwear. A shift in the average pressure under the foot was seen, moving from the heels of the feet to the midfoot area, while remaining similar in the front foot area.
“Patient feedback has been mixed,” Mr. O’Sullivan said when presenting the poster. “Patients state that blisters have often reduced in the heels and forefoot, but new blisters have developed in the midfoot.” As a result, some study participants chose to alternate wearing the rocker bottom footwear with their normal shoes, to even out the places where blisters might form.
Although the jury is still out on the benefit of rocker bottom footwear, one thing that might help those with EBS who develop regular foot blisters may be to keep their weight in check. In a separate poster presentation given by Lynn Hubbard, a specialist EB dietitian in the department of nutrition and dietetics at St. Thomas’ Hospital in London, it was shown that almost a third of patients with EB simplex were obese, compared with 26% of adults in the general U.K. population.
“People with EBS are known to have hyperkeratosis and foot-blistering,” Ms. Hubbard observed in the poster. This can lead to reduce mobility and pain, which “may in turn have an impact on body weight, and an increased BMI [body mass index] may further affect mobility.”
Data were collected on 90 patients who attended a U.K. EBS clinic over an 11-month period. While 45.5% of patients had a normal weight, the majority was overweight (21.1%), obese (21.1%), or morbidly obese (10%).
Fifteen patients completed questionnaires about their mobility, and almost all felt that their weight had an adverse effect on their feet, as did EBS. Several also noted problems with their EBS, in the skin folds around the bra, waist, and sock lines.
“We now plan to begin a pilot study to establish a supportive weight management program for people with EBS and evaluate both weight loss and impact on mobility,” Ms. Hubbard reported.
No conflicts of interest were declared by any of the speakers.
SOURCES: EB 2020. Reimer A et al. Poster 26; Khan T. oral presentation; O’Sullivan M et al. Poster 93; Hubbard L. Poster 19.
REPORTING FROM EB 2020
Hand deformity happens early in children with dystrophic epidermolysis bullosa
London – A predictable course of hand contracture was seen in a U.K. study of children with recessive dystrophic epidermolysis bullosa (RDEB), with all children experiencing moderate or severe hand deformity by the age of 12 years.
This stark finding, reported at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA), highlighted the importance of intervening early with surgical methods that aim to prevent the pseudosyndactyly, or “mitten” hand deformity, which is an unfortunate characteristic of the genetic skin condition.
The investigative team, from the plastic and reconstructive surgery department at Great Ormond Street Hospital for Children NHS Trust, London, presented data from a retrospective case review of 24 children who attended their specialist pediatric EB center between 2010 and 2019. Of these, seven children had surgery to release hand contractures.
A total of 250 hand assessments were made via the novel Assessment of the Component Hand Contractures in Epidermolysis Bullosa (ACE). The assessment provides a hand deformity grade (HDG) – none, mild, moderate, and severe –based on the typical contractures that are seen in RDEB, such as between the fingers (web space contractures), finger flexion contractures, and thumb adduction contractures.
Using the ACE tool, “we found four significant time points regarding hand contracture development,” Catherine Miller, one of the team’s occupational therapists, said during a poster presentation. At birth, none of the children had any signs of hand deformity, but by 2 years of age half had mild hand contracture. By age 6, all children had some form of hand deformity, Ms. Miller said, and by age 12 all had moderate to severe hand deformity, “so adding to the data that hand deformities really are inevitable.”
Other findings were that the thumb and finger web spaces were the first to contract, Ms. Miller said. “So they tend to develop earlier and progress relatively slowly.” By contrast the finger flexion contractures occurred later on, “but progress more relatively rapidly,” she observed.
“Our data are limited as not every child is included at every age, and out tool has not yet been validated,” Ms. Miller and team acknowledged in the poster. “We assume that hand contractures do not improve, and therefore have included operated hands (mean age 6 years) at their last preoperative HDG in order to represent older children and more advanced hand deformities.”
In an interview, Ms. Miller noted that families have a lot going on when their newborn is diagnosed with RDEB, so introducing the idea that there will be substantial hand deformities in the future “is a difficult conversation. We have to take that gently.”
There are nonsurgical approaches to keeping the hands open, such as “encouraging them to open their hands in play, daily stretches; we can make splints with a silicon substance and other thermoplastic materials,” Ms. Miller said.
Hand surgery is a ‘blunt tool’
“The primary problem, of course, is the dermal fibrosis that we see that creates scarring and secondary problems,” said Gill Smith, a plastic surgery consultant who works with Ms. Miller at the hospital.
“In an ideal world, you would bandage up [the children] so that they could never injure their hands, but then they couldn’t use them, they couldn’t grow properly, and they could not develop,” Ms. Smith said in an oral presentation about hand surgery in children with RDEB. “You do not want them to get to the secondary stage, because the secondary stage is a real problem – you get all these impairments of hand function – pseudosyndactyly, finger contraction, and first web contracture, and ending up in a ‘mitten’ hand.”
Surgery is a very “crude” and “blunt tool,” Ms. Smith emphasized. Prevention is key, and perhaps in the future gene therapy, mesenchymal stem cells, and the like will mean that there is less need for hand surgery, she intimated. Until then, there are some things that can be done surgically – such as wrapping the hands, using gloves to protect the skin, stretching out the web spaces of the palm, and using splints. “All of these things we are trying to improve all the time, and come up with new ideas.”
The question is when to intervene? Ms. Smith said that in any other type of hand surgery, particularly in children where growth and function might be affected, the aim would be to “go in early.” In children with RDEB, however, the timing is not so clear: “Should we be going in early, before secondary joint changes, before we get secondary tendon shortening?” Perhaps this would result in less complex surgery, she suggested, but “it is a really huge deal for families and for children. For the moment we are still only really doing it when there [are] quite significant functional difficulties.”
When it comes to the type of surgery done to release the hands, “everyone has variants on the release technique,” but none are known to be better than any other, Ms. Smith said. Surgical release deals with consequences of dermal fibrosis but also creates more fibrosis, she cautioned.
Effects of hand surgery do not last long
How long the surgery’s effect will last is “what everyone wants to know, and I don’t think anyone has found a really good answer. It is variable, but unfortunately it’s a lot shorter than we’d like,” said Ms. Smith.
Indeed, data in another poster presentation by Ms. Smith and colleagues showed that the situation can be ‘back to square one’ within just a couple of years. Of the seven patients who had surgery at a mean 7 years of age (range 6-10 years), “most had returned to their original total score by 2 years post surgery,” the team wrote. All children “were initially happy with both appearance and function after surgery” they added; however, “happiness gradually decreased with time as they lost function and their scores increased with recurrence of contracture.”
The team noted that “sometimes after surgery a different component of the hand contracture worsened but function was preserved.”
While the ACE tool used by the team has not yet been validated, they believe it to be “a systematic tool with a structured method of administration.” As such it can help with informed decision making, they believe, and it could be used with functional measures to see how hand contractures might be impacting hand function and quality of life.
The ACE tool can be downloaded for free from the GOSH website.
SOURCE: Jessop N et al. EB 2020. Posters 42 and 43; Smith G et al. Poster 63.
London – A predictable course of hand contracture was seen in a U.K. study of children with recessive dystrophic epidermolysis bullosa (RDEB), with all children experiencing moderate or severe hand deformity by the age of 12 years.
This stark finding, reported at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA), highlighted the importance of intervening early with surgical methods that aim to prevent the pseudosyndactyly, or “mitten” hand deformity, which is an unfortunate characteristic of the genetic skin condition.
The investigative team, from the plastic and reconstructive surgery department at Great Ormond Street Hospital for Children NHS Trust, London, presented data from a retrospective case review of 24 children who attended their specialist pediatric EB center between 2010 and 2019. Of these, seven children had surgery to release hand contractures.
A total of 250 hand assessments were made via the novel Assessment of the Component Hand Contractures in Epidermolysis Bullosa (ACE). The assessment provides a hand deformity grade (HDG) – none, mild, moderate, and severe –based on the typical contractures that are seen in RDEB, such as between the fingers (web space contractures), finger flexion contractures, and thumb adduction contractures.
Using the ACE tool, “we found four significant time points regarding hand contracture development,” Catherine Miller, one of the team’s occupational therapists, said during a poster presentation. At birth, none of the children had any signs of hand deformity, but by 2 years of age half had mild hand contracture. By age 6, all children had some form of hand deformity, Ms. Miller said, and by age 12 all had moderate to severe hand deformity, “so adding to the data that hand deformities really are inevitable.”
Other findings were that the thumb and finger web spaces were the first to contract, Ms. Miller said. “So they tend to develop earlier and progress relatively slowly.” By contrast the finger flexion contractures occurred later on, “but progress more relatively rapidly,” she observed.
“Our data are limited as not every child is included at every age, and out tool has not yet been validated,” Ms. Miller and team acknowledged in the poster. “We assume that hand contractures do not improve, and therefore have included operated hands (mean age 6 years) at their last preoperative HDG in order to represent older children and more advanced hand deformities.”
In an interview, Ms. Miller noted that families have a lot going on when their newborn is diagnosed with RDEB, so introducing the idea that there will be substantial hand deformities in the future “is a difficult conversation. We have to take that gently.”
There are nonsurgical approaches to keeping the hands open, such as “encouraging them to open their hands in play, daily stretches; we can make splints with a silicon substance and other thermoplastic materials,” Ms. Miller said.
Hand surgery is a ‘blunt tool’
“The primary problem, of course, is the dermal fibrosis that we see that creates scarring and secondary problems,” said Gill Smith, a plastic surgery consultant who works with Ms. Miller at the hospital.
“In an ideal world, you would bandage up [the children] so that they could never injure their hands, but then they couldn’t use them, they couldn’t grow properly, and they could not develop,” Ms. Smith said in an oral presentation about hand surgery in children with RDEB. “You do not want them to get to the secondary stage, because the secondary stage is a real problem – you get all these impairments of hand function – pseudosyndactyly, finger contraction, and first web contracture, and ending up in a ‘mitten’ hand.”
Surgery is a very “crude” and “blunt tool,” Ms. Smith emphasized. Prevention is key, and perhaps in the future gene therapy, mesenchymal stem cells, and the like will mean that there is less need for hand surgery, she intimated. Until then, there are some things that can be done surgically – such as wrapping the hands, using gloves to protect the skin, stretching out the web spaces of the palm, and using splints. “All of these things we are trying to improve all the time, and come up with new ideas.”
The question is when to intervene? Ms. Smith said that in any other type of hand surgery, particularly in children where growth and function might be affected, the aim would be to “go in early.” In children with RDEB, however, the timing is not so clear: “Should we be going in early, before secondary joint changes, before we get secondary tendon shortening?” Perhaps this would result in less complex surgery, she suggested, but “it is a really huge deal for families and for children. For the moment we are still only really doing it when there [are] quite significant functional difficulties.”
When it comes to the type of surgery done to release the hands, “everyone has variants on the release technique,” but none are known to be better than any other, Ms. Smith said. Surgical release deals with consequences of dermal fibrosis but also creates more fibrosis, she cautioned.
Effects of hand surgery do not last long
How long the surgery’s effect will last is “what everyone wants to know, and I don’t think anyone has found a really good answer. It is variable, but unfortunately it’s a lot shorter than we’d like,” said Ms. Smith.
Indeed, data in another poster presentation by Ms. Smith and colleagues showed that the situation can be ‘back to square one’ within just a couple of years. Of the seven patients who had surgery at a mean 7 years of age (range 6-10 years), “most had returned to their original total score by 2 years post surgery,” the team wrote. All children “were initially happy with both appearance and function after surgery” they added; however, “happiness gradually decreased with time as they lost function and their scores increased with recurrence of contracture.”
The team noted that “sometimes after surgery a different component of the hand contracture worsened but function was preserved.”
While the ACE tool used by the team has not yet been validated, they believe it to be “a systematic tool with a structured method of administration.” As such it can help with informed decision making, they believe, and it could be used with functional measures to see how hand contractures might be impacting hand function and quality of life.
The ACE tool can be downloaded for free from the GOSH website.
SOURCE: Jessop N et al. EB 2020. Posters 42 and 43; Smith G et al. Poster 63.
London – A predictable course of hand contracture was seen in a U.K. study of children with recessive dystrophic epidermolysis bullosa (RDEB), with all children experiencing moderate or severe hand deformity by the age of 12 years.
This stark finding, reported at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA), highlighted the importance of intervening early with surgical methods that aim to prevent the pseudosyndactyly, or “mitten” hand deformity, which is an unfortunate characteristic of the genetic skin condition.
The investigative team, from the plastic and reconstructive surgery department at Great Ormond Street Hospital for Children NHS Trust, London, presented data from a retrospective case review of 24 children who attended their specialist pediatric EB center between 2010 and 2019. Of these, seven children had surgery to release hand contractures.
A total of 250 hand assessments were made via the novel Assessment of the Component Hand Contractures in Epidermolysis Bullosa (ACE). The assessment provides a hand deformity grade (HDG) – none, mild, moderate, and severe –based on the typical contractures that are seen in RDEB, such as between the fingers (web space contractures), finger flexion contractures, and thumb adduction contractures.
Using the ACE tool, “we found four significant time points regarding hand contracture development,” Catherine Miller, one of the team’s occupational therapists, said during a poster presentation. At birth, none of the children had any signs of hand deformity, but by 2 years of age half had mild hand contracture. By age 6, all children had some form of hand deformity, Ms. Miller said, and by age 12 all had moderate to severe hand deformity, “so adding to the data that hand deformities really are inevitable.”
Other findings were that the thumb and finger web spaces were the first to contract, Ms. Miller said. “So they tend to develop earlier and progress relatively slowly.” By contrast the finger flexion contractures occurred later on, “but progress more relatively rapidly,” she observed.
“Our data are limited as not every child is included at every age, and out tool has not yet been validated,” Ms. Miller and team acknowledged in the poster. “We assume that hand contractures do not improve, and therefore have included operated hands (mean age 6 years) at their last preoperative HDG in order to represent older children and more advanced hand deformities.”
In an interview, Ms. Miller noted that families have a lot going on when their newborn is diagnosed with RDEB, so introducing the idea that there will be substantial hand deformities in the future “is a difficult conversation. We have to take that gently.”
There are nonsurgical approaches to keeping the hands open, such as “encouraging them to open their hands in play, daily stretches; we can make splints with a silicon substance and other thermoplastic materials,” Ms. Miller said.
Hand surgery is a ‘blunt tool’
“The primary problem, of course, is the dermal fibrosis that we see that creates scarring and secondary problems,” said Gill Smith, a plastic surgery consultant who works with Ms. Miller at the hospital.
“In an ideal world, you would bandage up [the children] so that they could never injure their hands, but then they couldn’t use them, they couldn’t grow properly, and they could not develop,” Ms. Smith said in an oral presentation about hand surgery in children with RDEB. “You do not want them to get to the secondary stage, because the secondary stage is a real problem – you get all these impairments of hand function – pseudosyndactyly, finger contraction, and first web contracture, and ending up in a ‘mitten’ hand.”
Surgery is a very “crude” and “blunt tool,” Ms. Smith emphasized. Prevention is key, and perhaps in the future gene therapy, mesenchymal stem cells, and the like will mean that there is less need for hand surgery, she intimated. Until then, there are some things that can be done surgically – such as wrapping the hands, using gloves to protect the skin, stretching out the web spaces of the palm, and using splints. “All of these things we are trying to improve all the time, and come up with new ideas.”
The question is when to intervene? Ms. Smith said that in any other type of hand surgery, particularly in children where growth and function might be affected, the aim would be to “go in early.” In children with RDEB, however, the timing is not so clear: “Should we be going in early, before secondary joint changes, before we get secondary tendon shortening?” Perhaps this would result in less complex surgery, she suggested, but “it is a really huge deal for families and for children. For the moment we are still only really doing it when there [are] quite significant functional difficulties.”
When it comes to the type of surgery done to release the hands, “everyone has variants on the release technique,” but none are known to be better than any other, Ms. Smith said. Surgical release deals with consequences of dermal fibrosis but also creates more fibrosis, she cautioned.
Effects of hand surgery do not last long
How long the surgery’s effect will last is “what everyone wants to know, and I don’t think anyone has found a really good answer. It is variable, but unfortunately it’s a lot shorter than we’d like,” said Ms. Smith.
Indeed, data in another poster presentation by Ms. Smith and colleagues showed that the situation can be ‘back to square one’ within just a couple of years. Of the seven patients who had surgery at a mean 7 years of age (range 6-10 years), “most had returned to their original total score by 2 years post surgery,” the team wrote. All children “were initially happy with both appearance and function after surgery” they added; however, “happiness gradually decreased with time as they lost function and their scores increased with recurrence of contracture.”
The team noted that “sometimes after surgery a different component of the hand contracture worsened but function was preserved.”
While the ACE tool used by the team has not yet been validated, they believe it to be “a systematic tool with a structured method of administration.” As such it can help with informed decision making, they believe, and it could be used with functional measures to see how hand contractures might be impacting hand function and quality of life.
The ACE tool can be downloaded for free from the GOSH website.
SOURCE: Jessop N et al. EB 2020. Posters 42 and 43; Smith G et al. Poster 63.
REPORTING FROM EB 2020
Epidermolysis bullosa classification criteria refined and ready
LONDON – have come in understanding this debilitating group of genetic skin diseases, but also how far there is still to go towards improving the management of those affected.
Previous criteria issued in 2014 represented “important progress” and “built on the achievements of several generations of physicians and researchers who described the phenotypes, the level of skin cleavage, developed and characterized antibodies, and discovered EB-associated genes,” Cristina Has, MD, said at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA).
Dr. Has, a senior dermatologist and professor of experimental dermatology at the University of Freiburg (Germany), observed that prior criteria had “introduced genetic and molecular data in a so-called onion-skin classification of EB, and removed most of the eponyms,” which had been maintained in the latest update.
“What is new, and probably the most important change, is making the distinction between classical EB and other disorders with skin fragility,” she said, noting that the revised classification criteria for EB included minor changes to the nomenclature of EB. Six new EB subtypes and genes have also been added, and there are new sections on genotype/phenotype correlations, disease modifying factors, and the natural history of EB. Furthermore, supporting information included a concise description of clinical and genetic features of all EB types and subtypes.
The updated criteria are the result of an expert meeting held in April 2019 and have been accepted for publication. The expert panel that developed the criteria think that the revised classification criteria will be “useful and, we hope, inspiring and motivating for the young generation of dermatologists, pediatricians, and for the researchers who work in this field,” Dr. Has said.
“The term EB has been used in the last years for many new disorders, and this is the reason why we thought we have to somehow control this, and to make the distinction between classical epidermolysis bullosa due to defects at the dermal junction and other disorders with skin fragility where the anomalies occur within other layers of the epidermis or in the dermis,” Dr. Has explained.
There are still 4 main types of classical EB: EB simplex (EBS), dystrophic EB (DEB), junctional EB, and Kindler EB, but there are now 34 subtypes, slightly fewer than before. The updated criteria distinguish between the types and subtypes according to the level of skin cleavage, the inheritance pattern, the mutated gene, and the targeted protein, Dr. Has said.
As for peeling disorders, these have been classified as being erosive or hyperkeratotic, or as affecting the connective tissue with skin blistering. Similar to classical EB, these disorders are associated with fragility of the skin and mucosa and share some pathogenetic mechanisms. Moreover, as “the suffering of the patient is similar,” Dr. Has said, “we’d like to consider them under the umbrella of EB.” Most of the disorders she listed were inherited via an autosomal recessive mechanism, with intraepidermal disorders inherited via an autosomal dominant mechanism. New genes are being identified the time, she added, so these groupings will no doubt be subject to future revisions.
Minor changes to nomenclature were made to avoid confusion among clinicians and those living with the condition. As such, Kindler EB replaces Kindler syndrome, names of some subtypes were simplified, and a new “self-improving” type of DEB was introduced to replace the term “transient dermolysis of the newborn.” Altogether, there are now 11 subtypes of DEB. A distinction was also made between syndromic and nonsyndromic EB. “We all know that EB can be a systemic disorder with secondary manifestations within different organs,” Dr. Has told conference attendees. Anemia and failure to thrive can be associated, but it still remains a nonsyndromic disorder, she said. By contrast, “syndromic EB is due to genetic defects, which are also expressed in other organs than the skin or mucosal membranes, and lead to primary extracutaneous manifestations, such as cardiomyopathy, nephropathy, and so on.”
There are fewer subtypes of EBS and “we think they are better defined,” Dr. Has stated. “EB simplex is the most heterogenous EB type, clinically and genetically, and includes several syndromic disorders,” and the new classification criteria should be useful in helping categorize individuals with EBS and thus help target their management.
One of the six new subtypes of EB included in the revised classification criteria is “syndromic EBS with cardiomyopathy” caused by the KLH24 mutation. This gene was discovered in 2016 and more than 40 cases have so far been identified, 50% of which have been sporadic de novo mutations.
Other new EB subtypes are:
- “EBS with localized nephropathy” caused by a mutation in the CD151 gene.
- An autosomal recessive EBS linked to the KRT5 gene.
- A new phenotype that manifests with oral mucosal blisters linked to the DSG3 gene. (Although only a single case has been reported to date, it was felt worthy of inclusion.)
- Another linked to DSG3 that leads to skin fragility and hypertrichosis.
- A new dystrophic EB subtype linked to mutations in the PLOD3 gene.
In an interview, Dr. Has reiterated the importance of keeping classification criteria updated in line with current research findings. She emphasized that there were many types of EB and how important it was to refine how these were classified based on the underlying genetics.
“We brought much more genetic data into the paper, because we are in the era of personalized medicine,” she said. “There are specific therapies for mutations and for different subtypes and that’s why we think that, step by step, we have to bring in more and more data into the classification.”
There are many people with EBS, she observed, and while these individuals may not have such a dramatic clinical presentation as those with recessive DEB, for example, the effect of the condition on their daily lives is no less. “These people are active, they have jobs, they have to work, and they have pain, they have blister,” Dr. Has said.
While the criteria are intended only for classification of EB, they might help in practice. Dr. Has gave an anecdotal example of a woman that has been misdiagnosed as having a type of DEB with a high risk of squamous cell carcinoma but in fact had a different form of EB with no risk of developing SCC. “That’s why criteria are important,” she said.
Dr. Has had no conflicts of interest to disclose.
LONDON – have come in understanding this debilitating group of genetic skin diseases, but also how far there is still to go towards improving the management of those affected.
Previous criteria issued in 2014 represented “important progress” and “built on the achievements of several generations of physicians and researchers who described the phenotypes, the level of skin cleavage, developed and characterized antibodies, and discovered EB-associated genes,” Cristina Has, MD, said at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA).
Dr. Has, a senior dermatologist and professor of experimental dermatology at the University of Freiburg (Germany), observed that prior criteria had “introduced genetic and molecular data in a so-called onion-skin classification of EB, and removed most of the eponyms,” which had been maintained in the latest update.
“What is new, and probably the most important change, is making the distinction between classical EB and other disorders with skin fragility,” she said, noting that the revised classification criteria for EB included minor changes to the nomenclature of EB. Six new EB subtypes and genes have also been added, and there are new sections on genotype/phenotype correlations, disease modifying factors, and the natural history of EB. Furthermore, supporting information included a concise description of clinical and genetic features of all EB types and subtypes.
The updated criteria are the result of an expert meeting held in April 2019 and have been accepted for publication. The expert panel that developed the criteria think that the revised classification criteria will be “useful and, we hope, inspiring and motivating for the young generation of dermatologists, pediatricians, and for the researchers who work in this field,” Dr. Has said.
“The term EB has been used in the last years for many new disorders, and this is the reason why we thought we have to somehow control this, and to make the distinction between classical epidermolysis bullosa due to defects at the dermal junction and other disorders with skin fragility where the anomalies occur within other layers of the epidermis or in the dermis,” Dr. Has explained.
There are still 4 main types of classical EB: EB simplex (EBS), dystrophic EB (DEB), junctional EB, and Kindler EB, but there are now 34 subtypes, slightly fewer than before. The updated criteria distinguish between the types and subtypes according to the level of skin cleavage, the inheritance pattern, the mutated gene, and the targeted protein, Dr. Has said.
As for peeling disorders, these have been classified as being erosive or hyperkeratotic, or as affecting the connective tissue with skin blistering. Similar to classical EB, these disorders are associated with fragility of the skin and mucosa and share some pathogenetic mechanisms. Moreover, as “the suffering of the patient is similar,” Dr. Has said, “we’d like to consider them under the umbrella of EB.” Most of the disorders she listed were inherited via an autosomal recessive mechanism, with intraepidermal disorders inherited via an autosomal dominant mechanism. New genes are being identified the time, she added, so these groupings will no doubt be subject to future revisions.
Minor changes to nomenclature were made to avoid confusion among clinicians and those living with the condition. As such, Kindler EB replaces Kindler syndrome, names of some subtypes were simplified, and a new “self-improving” type of DEB was introduced to replace the term “transient dermolysis of the newborn.” Altogether, there are now 11 subtypes of DEB. A distinction was also made between syndromic and nonsyndromic EB. “We all know that EB can be a systemic disorder with secondary manifestations within different organs,” Dr. Has told conference attendees. Anemia and failure to thrive can be associated, but it still remains a nonsyndromic disorder, she said. By contrast, “syndromic EB is due to genetic defects, which are also expressed in other organs than the skin or mucosal membranes, and lead to primary extracutaneous manifestations, such as cardiomyopathy, nephropathy, and so on.”
There are fewer subtypes of EBS and “we think they are better defined,” Dr. Has stated. “EB simplex is the most heterogenous EB type, clinically and genetically, and includes several syndromic disorders,” and the new classification criteria should be useful in helping categorize individuals with EBS and thus help target their management.
One of the six new subtypes of EB included in the revised classification criteria is “syndromic EBS with cardiomyopathy” caused by the KLH24 mutation. This gene was discovered in 2016 and more than 40 cases have so far been identified, 50% of which have been sporadic de novo mutations.
Other new EB subtypes are:
- “EBS with localized nephropathy” caused by a mutation in the CD151 gene.
- An autosomal recessive EBS linked to the KRT5 gene.
- A new phenotype that manifests with oral mucosal blisters linked to the DSG3 gene. (Although only a single case has been reported to date, it was felt worthy of inclusion.)
- Another linked to DSG3 that leads to skin fragility and hypertrichosis.
- A new dystrophic EB subtype linked to mutations in the PLOD3 gene.
In an interview, Dr. Has reiterated the importance of keeping classification criteria updated in line with current research findings. She emphasized that there were many types of EB and how important it was to refine how these were classified based on the underlying genetics.
“We brought much more genetic data into the paper, because we are in the era of personalized medicine,” she said. “There are specific therapies for mutations and for different subtypes and that’s why we think that, step by step, we have to bring in more and more data into the classification.”
There are many people with EBS, she observed, and while these individuals may not have such a dramatic clinical presentation as those with recessive DEB, for example, the effect of the condition on their daily lives is no less. “These people are active, they have jobs, they have to work, and they have pain, they have blister,” Dr. Has said.
While the criteria are intended only for classification of EB, they might help in practice. Dr. Has gave an anecdotal example of a woman that has been misdiagnosed as having a type of DEB with a high risk of squamous cell carcinoma but in fact had a different form of EB with no risk of developing SCC. “That’s why criteria are important,” she said.
Dr. Has had no conflicts of interest to disclose.
LONDON – have come in understanding this debilitating group of genetic skin diseases, but also how far there is still to go towards improving the management of those affected.
Previous criteria issued in 2014 represented “important progress” and “built on the achievements of several generations of physicians and researchers who described the phenotypes, the level of skin cleavage, developed and characterized antibodies, and discovered EB-associated genes,” Cristina Has, MD, said at the EB World Congress, organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA).
Dr. Has, a senior dermatologist and professor of experimental dermatology at the University of Freiburg (Germany), observed that prior criteria had “introduced genetic and molecular data in a so-called onion-skin classification of EB, and removed most of the eponyms,” which had been maintained in the latest update.
“What is new, and probably the most important change, is making the distinction between classical EB and other disorders with skin fragility,” she said, noting that the revised classification criteria for EB included minor changes to the nomenclature of EB. Six new EB subtypes and genes have also been added, and there are new sections on genotype/phenotype correlations, disease modifying factors, and the natural history of EB. Furthermore, supporting information included a concise description of clinical and genetic features of all EB types and subtypes.
The updated criteria are the result of an expert meeting held in April 2019 and have been accepted for publication. The expert panel that developed the criteria think that the revised classification criteria will be “useful and, we hope, inspiring and motivating for the young generation of dermatologists, pediatricians, and for the researchers who work in this field,” Dr. Has said.
“The term EB has been used in the last years for many new disorders, and this is the reason why we thought we have to somehow control this, and to make the distinction between classical epidermolysis bullosa due to defects at the dermal junction and other disorders with skin fragility where the anomalies occur within other layers of the epidermis or in the dermis,” Dr. Has explained.
There are still 4 main types of classical EB: EB simplex (EBS), dystrophic EB (DEB), junctional EB, and Kindler EB, but there are now 34 subtypes, slightly fewer than before. The updated criteria distinguish between the types and subtypes according to the level of skin cleavage, the inheritance pattern, the mutated gene, and the targeted protein, Dr. Has said.
As for peeling disorders, these have been classified as being erosive or hyperkeratotic, or as affecting the connective tissue with skin blistering. Similar to classical EB, these disorders are associated with fragility of the skin and mucosa and share some pathogenetic mechanisms. Moreover, as “the suffering of the patient is similar,” Dr. Has said, “we’d like to consider them under the umbrella of EB.” Most of the disorders she listed were inherited via an autosomal recessive mechanism, with intraepidermal disorders inherited via an autosomal dominant mechanism. New genes are being identified the time, she added, so these groupings will no doubt be subject to future revisions.
Minor changes to nomenclature were made to avoid confusion among clinicians and those living with the condition. As such, Kindler EB replaces Kindler syndrome, names of some subtypes were simplified, and a new “self-improving” type of DEB was introduced to replace the term “transient dermolysis of the newborn.” Altogether, there are now 11 subtypes of DEB. A distinction was also made between syndromic and nonsyndromic EB. “We all know that EB can be a systemic disorder with secondary manifestations within different organs,” Dr. Has told conference attendees. Anemia and failure to thrive can be associated, but it still remains a nonsyndromic disorder, she said. By contrast, “syndromic EB is due to genetic defects, which are also expressed in other organs than the skin or mucosal membranes, and lead to primary extracutaneous manifestations, such as cardiomyopathy, nephropathy, and so on.”
There are fewer subtypes of EBS and “we think they are better defined,” Dr. Has stated. “EB simplex is the most heterogenous EB type, clinically and genetically, and includes several syndromic disorders,” and the new classification criteria should be useful in helping categorize individuals with EBS and thus help target their management.
One of the six new subtypes of EB included in the revised classification criteria is “syndromic EBS with cardiomyopathy” caused by the KLH24 mutation. This gene was discovered in 2016 and more than 40 cases have so far been identified, 50% of which have been sporadic de novo mutations.
Other new EB subtypes are:
- “EBS with localized nephropathy” caused by a mutation in the CD151 gene.
- An autosomal recessive EBS linked to the KRT5 gene.
- A new phenotype that manifests with oral mucosal blisters linked to the DSG3 gene. (Although only a single case has been reported to date, it was felt worthy of inclusion.)
- Another linked to DSG3 that leads to skin fragility and hypertrichosis.
- A new dystrophic EB subtype linked to mutations in the PLOD3 gene.
In an interview, Dr. Has reiterated the importance of keeping classification criteria updated in line with current research findings. She emphasized that there were many types of EB and how important it was to refine how these were classified based on the underlying genetics.
“We brought much more genetic data into the paper, because we are in the era of personalized medicine,” she said. “There are specific therapies for mutations and for different subtypes and that’s why we think that, step by step, we have to bring in more and more data into the classification.”
There are many people with EBS, she observed, and while these individuals may not have such a dramatic clinical presentation as those with recessive DEB, for example, the effect of the condition on their daily lives is no less. “These people are active, they have jobs, they have to work, and they have pain, they have blister,” Dr. Has said.
While the criteria are intended only for classification of EB, they might help in practice. Dr. Has gave an anecdotal example of a woman that has been misdiagnosed as having a type of DEB with a high risk of squamous cell carcinoma but in fact had a different form of EB with no risk of developing SCC. “That’s why criteria are important,” she said.
Dr. Has had no conflicts of interest to disclose.
REPORTING FROM EB 2020