Amy Karon

Fully 48% of patients with autoimmune rheumatic diseases who developed persistent hypogammaglobulinemia after initiating treatment with immunomodulatory agents harbored gene variants associated with inborn errors of immunity, according to the findings of a single-center study published in Annals of the Rheumatic Diseases.

The results raise the possibility of a shared genetic etiology between “primary” and “secondary” hypogammaglobulinemia and suggest that some cases of autoimmune rheumatic disease may result from inborn errors of immunity. “In other words, a rheumatologist may be treating the rheumatic manifestations of a primary immunodeficiency disorder,” the study’s lead author, Georgios Sogkas, MD, PhD, said in an interview.

‘Striking’ findings suggest a future in personalized medicine

Experts who were not involved in the study called the results noteworthy. “The fact that half of patients with rheumatic disease who developed secondary hypogammaglobulinemia were found to have a functionally relevant mutation in a known PID gene is striking, albeit purely circumstantial given the absence of any functional or mechanistic data,” said Michael J. Ombrello, MD, principal investigator and head of the translational genetics and genomics unit at the National Institute of Arthritis and Musculoskeletal and Skin Diseases, who was not involved in the study.

The findings, if they are validated by additional studies, might help clinicians personalize medicine by avoiding hypogammaglobulinemia-inducing immunomodulatory regimens in genetically predisposed patients, or by targeting Janus kinase (JAK) inhibitor therapy for patients with STAT3 gain-of-function variants, or PI3K delta inhibitors for patients with variants leading to hyperactivation of the PI3Kdelta gene, Dr. Sogkas said.

Dr. Ombrello agreed: “Whether the hypogammaglobulinemia is classified as primary or secondary, the presence of these genetic variants in half of patients with hypogammaglobulinemia suggests an opportunity to improve clinical care. Although far off at this point, one can imagine a day where genetic data allows a rheumatologist to identify new-onset rheumatic disease patients carrying PID gene mutations and cater their therapy and monitoring accordingly.”

If further research validates these findings, they would add to a growing body of support for incorporating expanded or universal exome or genome sequencing in the care of medically complex patients, such as those with rheumatic diseases, Dr. Ombrello said. However, he cautioned that the investigators could have “overstated” the relationship in their study between secondary hypogammaglobulinemia and immunomodulatory treatment. The fact that a small group of study participants (about 7%) developed hypogammaglobulinemia after initiating immunomodulatory therapy does not confirm a causal relationship, he emphasized. Common variable immune deficiency (CVID) can develop in adults as late as the fifth and sixth decade of life, he noted, making it “not implausible that a small number of rheumatic disease patients would develop CVID while under the care of a rheumatologist. Would these patients have developed hypogammaglobulinemia even without treatment with immunomodulators, purely related to their genetic mutations? If so, they would be better classified as having primary immune deficiency, although that distinction is largely one of semantics.”

‘Rheumatologists are obliged to step up’

Interestingly, only 23% of the patients with hypogammaglobulinemia in the study had a clinically significant history of infections even though only 9% were receiving prophylactic antibiotics. Such findings highlight the complexity of PIDs, according to experts. “A long generation ago, we thought of immunodeficiencies as infections. Now we see them as autoimmune diseases, inflammatory diseases, allergic diseases – the spectrum continues to enlarge,” said Leonard H. Calabrese, DO, the RJ Fasenmyer chair of clinical immunology at the Cleveland Clinic, who was not involved in the study.

Dr. Calabrese noted that more than 450 monogenic variants have been linked to inborn errors of immunity. “Because these [PIDs] can mimic autoinflammatory presentations, rheumatologists are obliged to step up and gain a greater understanding, to be able to recognize and diagnose them and sort them out.”

Future goals should include quantifying the prevalence of genetic variants underlying hypogammaglobulinemia among patients with rheumatic diseases, and better characterizing outcomes and phenotypes of patients harboring variants linked to inborn errors of immunity, Dr. Sogkas said. “Whether these patients actually have a different disease than what they are being treated for, I can’t tell from this paper, and that’s an important question for the future,” added Dr. Calabrese. “I also do wonder about the effects of different drugs,” he said, noting that many patients with PID-associated autosomal gene variants developed persistent secondary hypogammaglobulinemia after initiating methotrexate. “It makes me wonder whether some of these genes have a specific interaction with methotrexate,” he said. “That could be a biomarker for drug toxicity.”

Study funders included the German Research Foundation, the German multiorgan Autoimmunity Network, Hannover Medical School, the Rosemarie-Germscheid Foundation, the German Academic Exchange Service, HBRS, the Center for Infection Biology, and the German Center for Infection Research. The investigators reported having no competing interests.

SOURCE: Sogkas G et al. Ann Rheum Dis. 2020 Oct 12. doi: 10.1136/annrheumdis-2020-218280.

Fully 48% of patients with autoimmune rheumatic diseases who developed persistent hypogammaglobulinemia after initiating treatment with immunomodulatory agents harbored gene variants associated with inborn errors of immunity, according to the findings of a single-center study published in Annals of the Rheumatic Diseases.

The results raise the possibility of a shared genetic etiology between “primary” and “secondary” hypogammaglobulinemia and suggest that some cases of autoimmune rheumatic disease may result from inborn errors of immunity. “In other words, a rheumatologist may be treating the rheumatic manifestations of a primary immunodeficiency disorder,” the study’s lead author, Georgios Sogkas, MD, PhD, said in an interview.

‘Striking’ findings suggest a future in personalized medicine

Experts who were not involved in the study called the results noteworthy. “The fact that half of patients with rheumatic disease who developed secondary hypogammaglobulinemia were found to have a functionally relevant mutation in a known PID gene is striking, albeit purely circumstantial given the absence of any functional or mechanistic data,” said Michael J. Ombrello, MD, principal investigator and head of the translational genetics and genomics unit at the National Institute of Arthritis and Musculoskeletal and Skin Diseases, who was not involved in the study.

The findings, if they are validated by additional studies, might help clinicians personalize medicine by avoiding hypogammaglobulinemia-inducing immunomodulatory regimens in genetically predisposed patients, or by targeting Janus kinase (JAK) inhibitor therapy for patients with STAT3 gain-of-function variants, or PI3K delta inhibitors for patients with variants leading to hyperactivation of the PI3Kdelta gene, Dr. Sogkas said.

Dr. Ombrello agreed: “Whether the hypogammaglobulinemia is classified as primary or secondary, the presence of these genetic variants in half of patients with hypogammaglobulinemia suggests an opportunity to improve clinical care. Although far off at this point, one can imagine a day where genetic data allows a rheumatologist to identify new-onset rheumatic disease patients carrying PID gene mutations and cater their therapy and monitoring accordingly.”

If further research validates these findings, they would add to a growing body of support for incorporating expanded or universal exome or genome sequencing in the care of medically complex patients, such as those with rheumatic diseases, Dr. Ombrello said. However, he cautioned that the investigators could have “overstated” the relationship in their study between secondary hypogammaglobulinemia and immunomodulatory treatment. The fact that a small group of study participants (about 7%) developed hypogammaglobulinemia after initiating immunomodulatory therapy does not confirm a causal relationship, he emphasized. Common variable immune deficiency (CVID) can develop in adults as late as the fifth and sixth decade of life, he noted, making it “not implausible that a small number of rheumatic disease patients would develop CVID while under the care of a rheumatologist. Would these patients have developed hypogammaglobulinemia even without treatment with immunomodulators, purely related to their genetic mutations? If so, they would be better classified as having primary immune deficiency, although that distinction is largely one of semantics.”

‘Rheumatologists are obliged to step up’

Interestingly, only 23% of the patients with hypogammaglobulinemia in the study had a clinically significant history of infections even though only 9% were receiving prophylactic antibiotics. Such findings highlight the complexity of PIDs, according to experts. “A long generation ago, we thought of immunodeficiencies as infections. Now we see them as autoimmune diseases, inflammatory diseases, allergic diseases – the spectrum continues to enlarge,” said Leonard H. Calabrese, DO, the RJ Fasenmyer chair of clinical immunology at the Cleveland Clinic, who was not involved in the study.

Dr. Calabrese noted that more than 450 monogenic variants have been linked to inborn errors of immunity. “Because these [PIDs] can mimic autoinflammatory presentations, rheumatologists are obliged to step up and gain a greater understanding, to be able to recognize and diagnose them and sort them out.”

Future goals should include quantifying the prevalence of genetic variants underlying hypogammaglobulinemia among patients with rheumatic diseases, and better characterizing outcomes and phenotypes of patients harboring variants linked to inborn errors of immunity, Dr. Sogkas said. “Whether these patients actually have a different disease than what they are being treated for, I can’t tell from this paper, and that’s an important question for the future,” added Dr. Calabrese. “I also do wonder about the effects of different drugs,” he said, noting that many patients with PID-associated autosomal gene variants developed persistent secondary hypogammaglobulinemia after initiating methotrexate. “It makes me wonder whether some of these genes have a specific interaction with methotrexate,” he said. “That could be a biomarker for drug toxicity.”

Study funders included the German Research Foundation, the German multiorgan Autoimmunity Network, Hannover Medical School, the Rosemarie-Germscheid Foundation, the German Academic Exchange Service, HBRS, the Center for Infection Biology, and the German Center for Infection Research. The investigators reported having no competing interests.

SOURCE: Sogkas G et al. Ann Rheum Dis. 2020 Oct 12. doi: 10.1136/annrheumdis-2020-218280.

Fully 48% of patients with autoimmune rheumatic diseases who developed persistent hypogammaglobulinemia after initiating treatment with immunomodulatory agents harbored gene variants associated with inborn errors of immunity, according to the findings of a single-center study published in Annals of the Rheumatic Diseases.

The results raise the possibility of a shared genetic etiology between “primary” and “secondary” hypogammaglobulinemia and suggest that some cases of autoimmune rheumatic disease may result from inborn errors of immunity. “In other words, a rheumatologist may be treating the rheumatic manifestations of a primary immunodeficiency disorder,” the study’s lead author, Georgios Sogkas, MD, PhD, said in an interview.

‘Striking’ findings suggest a future in personalized medicine

Experts who were not involved in the study called the results noteworthy. “The fact that half of patients with rheumatic disease who developed secondary hypogammaglobulinemia were found to have a functionally relevant mutation in a known PID gene is striking, albeit purely circumstantial given the absence of any functional or mechanistic data,” said Michael J. Ombrello, MD, principal investigator and head of the translational genetics and genomics unit at the National Institute of Arthritis and Musculoskeletal and Skin Diseases, who was not involved in the study.

The findings, if they are validated by additional studies, might help clinicians personalize medicine by avoiding hypogammaglobulinemia-inducing immunomodulatory regimens in genetically predisposed patients, or by targeting Janus kinase (JAK) inhibitor therapy for patients with STAT3 gain-of-function variants, or PI3K delta inhibitors for patients with variants leading to hyperactivation of the PI3Kdelta gene, Dr. Sogkas said.

Dr. Ombrello agreed: “Whether the hypogammaglobulinemia is classified as primary or secondary, the presence of these genetic variants in half of patients with hypogammaglobulinemia suggests an opportunity to improve clinical care. Although far off at this point, one can imagine a day where genetic data allows a rheumatologist to identify new-onset rheumatic disease patients carrying PID gene mutations and cater their therapy and monitoring accordingly.”

If further research validates these findings, they would add to a growing body of support for incorporating expanded or universal exome or genome sequencing in the care of medically complex patients, such as those with rheumatic diseases, Dr. Ombrello said. However, he cautioned that the investigators could have “overstated” the relationship in their study between secondary hypogammaglobulinemia and immunomodulatory treatment. The fact that a small group of study participants (about 7%) developed hypogammaglobulinemia after initiating immunomodulatory therapy does not confirm a causal relationship, he emphasized. Common variable immune deficiency (CVID) can develop in adults as late as the fifth and sixth decade of life, he noted, making it “not implausible that a small number of rheumatic disease patients would develop CVID while under the care of a rheumatologist. Would these patients have developed hypogammaglobulinemia even without treatment with immunomodulators, purely related to their genetic mutations? If so, they would be better classified as having primary immune deficiency, although that distinction is largely one of semantics.”

‘Rheumatologists are obliged to step up’

Interestingly, only 23% of the patients with hypogammaglobulinemia in the study had a clinically significant history of infections even though only 9% were receiving prophylactic antibiotics. Such findings highlight the complexity of PIDs, according to experts. “A long generation ago, we thought of immunodeficiencies as infections. Now we see them as autoimmune diseases, inflammatory diseases, allergic diseases – the spectrum continues to enlarge,” said Leonard H. Calabrese, DO, the RJ Fasenmyer chair of clinical immunology at the Cleveland Clinic, who was not involved in the study.

Dr. Calabrese noted that more than 450 monogenic variants have been linked to inborn errors of immunity. “Because these [PIDs] can mimic autoinflammatory presentations, rheumatologists are obliged to step up and gain a greater understanding, to be able to recognize and diagnose them and sort them out.”

Future goals should include quantifying the prevalence of genetic variants underlying hypogammaglobulinemia among patients with rheumatic diseases, and better characterizing outcomes and phenotypes of patients harboring variants linked to inborn errors of immunity, Dr. Sogkas said. “Whether these patients actually have a different disease than what they are being treated for, I can’t tell from this paper, and that’s an important question for the future,” added Dr. Calabrese. “I also do wonder about the effects of different drugs,” he said, noting that many patients with PID-associated autosomal gene variants developed persistent secondary hypogammaglobulinemia after initiating methotrexate. “It makes me wonder whether some of these genes have a specific interaction with methotrexate,” he said. “That could be a biomarker for drug toxicity.”

Study funders included the German Research Foundation, the German multiorgan Autoimmunity Network, Hannover Medical School, the Rosemarie-Germscheid Foundation, the German Academic Exchange Service, HBRS, the Center for Infection Biology, and the German Center for Infection Research. The investigators reported having no competing interests.

SOURCE: Sogkas G et al. Ann Rheum Dis. 2020 Oct 12. doi: 10.1136/annrheumdis-2020-218280.

Interleukin-23 optimizes antimicrobial macrophage activity, which is reduced among persons harboring an IL-23 receptor variant that helps protect against inflammatory bowel disease (IBD), recent research has found.

“These [findings] highlight that the susceptibility to infections with therapeutic blockade of the IL-23/IL-12 pathways may be owing in part to the essential role for IL-23 in mediating antimicrobial functions in macrophages. They further highlight that carriers of the IL-23R–Q381 variant, who are relatively protected from IBD and other immune-mediated diseases, may be at increased risk for bacterial infection,” Rui Sun and Clara Abraham, MD, of Yale University, New Haven, Conn., wrote in Cellular and Molecular Gastroenterology and Hepatology.

IL-23 is key to the pathogenesis of IBD and is being studied as a therapeutic target, both alone and in combination with IL-12 blocking. Although human macrophages express low levels of IL-23 receptor, recent research reveals that IL-23R is up-regulated “within minutes of exposure to IL-23,” which promotes signaling and cytokine secretion, the investigators wrote. However, the extent to which IL-23 supports macrophage antimicrobial activity was unknown. To characterize protein expression, signaling, and bacterial uptake and clearance of bacteria by human macrophages derived from monocytes, the investigators tested these cells with Western blot, flow cytometry, and gentamicin protection, which involved coculturing human macrophages with bacteria, adding gentamicin solution, and then lysing and plating the cells onto agar to assess the extent to which the macrophages had taken up the bacteria.

After 48 hours of exposure to IL-23 or IL-12, macrophages increased their intracellular clearance of clinically relevant bacteria, including Enterococcus faecalis, adherent invasive Escherichia coli, and Salmonella typhimurium. Notably, this did not occur when the investigators reduced (“knocked down”) macrophage expression of either IL-23R or IL-12 receptor alpha 2. Additional investigations showed that in macrophages, IL-23 promotes bacterial uptake, clearance, and autophagy by inducing a pyruvate dehydrogenase kinase 1 (PDK1)–dependent pathway mediated by Janus kinase 2/tyrosine kinase 2 and by inducing reactive oxygen species (ROS) and reactive nitrogen species (RNS) pathways. IL-23 also activates two key proteins involved in autophagy (ATG5 and ATG16L1), the researchers reported. “ROS, RNS, and autophagy cooperate to mediate IL-23-induced bacterial clearance. Reduction of each ROS, RNS, and autophagy pathway partially reversed the enhanced bacterial clearance observed with chronic IL-23 treatment.”

Further tests found that IL-23 mediates antimicrobial pathways through the Janus kinase 2, tyrosine kinase 2, and STAT3 pathways, which “cooperate to mediate optimal IL-23-induced intracellular bacterial clearance in human macrophages.” Importantly, human macrophages showed less antimicrobial activity when transfected with the IL-23R–Q381 variant than with IL-23R–R381. The IL-23R-Q381 variant, which reduces susceptibility to IBD, “decreased IL-23-induced and NOD2-induced antimicrobial pathways and intracellular bacterial clearance in monocyte-derived macrophages,” the researchers explained. Evaluating actual carriers of these variants showed the same results – macrophages harboring IBD-protective IL-23R–R381/Q381 exhibited lower antimicrobial activity and less intracellular bacterial clearance compared with macrophages from carriers of IL-23R–R381/R381.

“Taken together, IL-23 promotes increased bacterial uptake and then induces a more rapid and effective clearance of these intracellular bacteria in human monocyte-derived macrophages,” the researchers wrote. “The reduced inflammatory responses observed in IL-23R Q381 carriers are associated with protection from multiple immune-mediated diseases. This would imply that loss-of-function observed with the common IL-23R–R381Q variant may lead to a disadvantage in select infectious diseases, including through [this variant’s] now identified role in promoting antimicrobial pathways in macrophages.”

The National Institutes of Health provided funding. The investigators reported having no conflicts of interest.

SOURCE: Sun R, Abraham C. Cell Molec Gastro Hepatol. 2020 May 28. doi.: 10.1016/j.jcmgh.2020.05.007.

Interleukin-23 optimizes antimicrobial macrophage activity, which is reduced among persons harboring an IL-23 receptor variant that helps protect against inflammatory bowel disease (IBD), recent research has found.

“These [findings] highlight that the susceptibility to infections with therapeutic blockade of the IL-23/IL-12 pathways may be owing in part to the essential role for IL-23 in mediating antimicrobial functions in macrophages. They further highlight that carriers of the IL-23R–Q381 variant, who are relatively protected from IBD and other immune-mediated diseases, may be at increased risk for bacterial infection,” Rui Sun and Clara Abraham, MD, of Yale University, New Haven, Conn., wrote in Cellular and Molecular Gastroenterology and Hepatology.

IL-23 is key to the pathogenesis of IBD and is being studied as a therapeutic target, both alone and in combination with IL-12 blocking. Although human macrophages express low levels of IL-23 receptor, recent research reveals that IL-23R is up-regulated “within minutes of exposure to IL-23,” which promotes signaling and cytokine secretion, the investigators wrote. However, the extent to which IL-23 supports macrophage antimicrobial activity was unknown. To characterize protein expression, signaling, and bacterial uptake and clearance of bacteria by human macrophages derived from monocytes, the investigators tested these cells with Western blot, flow cytometry, and gentamicin protection, which involved coculturing human macrophages with bacteria, adding gentamicin solution, and then lysing and plating the cells onto agar to assess the extent to which the macrophages had taken up the bacteria.

After 48 hours of exposure to IL-23 or IL-12, macrophages increased their intracellular clearance of clinically relevant bacteria, including Enterococcus faecalis, adherent invasive Escherichia coli, and Salmonella typhimurium. Notably, this did not occur when the investigators reduced (“knocked down”) macrophage expression of either IL-23R or IL-12 receptor alpha 2. Additional investigations showed that in macrophages, IL-23 promotes bacterial uptake, clearance, and autophagy by inducing a pyruvate dehydrogenase kinase 1 (PDK1)–dependent pathway mediated by Janus kinase 2/tyrosine kinase 2 and by inducing reactive oxygen species (ROS) and reactive nitrogen species (RNS) pathways. IL-23 also activates two key proteins involved in autophagy (ATG5 and ATG16L1), the researchers reported. “ROS, RNS, and autophagy cooperate to mediate IL-23-induced bacterial clearance. Reduction of each ROS, RNS, and autophagy pathway partially reversed the enhanced bacterial clearance observed with chronic IL-23 treatment.”

Further tests found that IL-23 mediates antimicrobial pathways through the Janus kinase 2, tyrosine kinase 2, and STAT3 pathways, which “cooperate to mediate optimal IL-23-induced intracellular bacterial clearance in human macrophages.” Importantly, human macrophages showed less antimicrobial activity when transfected with the IL-23R–Q381 variant than with IL-23R–R381. The IL-23R-Q381 variant, which reduces susceptibility to IBD, “decreased IL-23-induced and NOD2-induced antimicrobial pathways and intracellular bacterial clearance in monocyte-derived macrophages,” the researchers explained. Evaluating actual carriers of these variants showed the same results – macrophages harboring IBD-protective IL-23R–R381/Q381 exhibited lower antimicrobial activity and less intracellular bacterial clearance compared with macrophages from carriers of IL-23R–R381/R381.

“Taken together, IL-23 promotes increased bacterial uptake and then induces a more rapid and effective clearance of these intracellular bacteria in human monocyte-derived macrophages,” the researchers wrote. “The reduced inflammatory responses observed in IL-23R Q381 carriers are associated with protection from multiple immune-mediated diseases. This would imply that loss-of-function observed with the common IL-23R–R381Q variant may lead to a disadvantage in select infectious diseases, including through [this variant’s] now identified role in promoting antimicrobial pathways in macrophages.”

The National Institutes of Health provided funding. The investigators reported having no conflicts of interest.

SOURCE: Sun R, Abraham C. Cell Molec Gastro Hepatol. 2020 May 28. doi.: 10.1016/j.jcmgh.2020.05.007.

Interleukin-23 optimizes antimicrobial macrophage activity, which is reduced among persons harboring an IL-23 receptor variant that helps protect against inflammatory bowel disease (IBD), recent research has found.

“These [findings] highlight that the susceptibility to infections with therapeutic blockade of the IL-23/IL-12 pathways may be owing in part to the essential role for IL-23 in mediating antimicrobial functions in macrophages. They further highlight that carriers of the IL-23R–Q381 variant, who are relatively protected from IBD and other immune-mediated diseases, may be at increased risk for bacterial infection,” Rui Sun and Clara Abraham, MD, of Yale University, New Haven, Conn., wrote in Cellular and Molecular Gastroenterology and Hepatology.

IL-23 is key to the pathogenesis of IBD and is being studied as a therapeutic target, both alone and in combination with IL-12 blocking. Although human macrophages express low levels of IL-23 receptor, recent research reveals that IL-23R is up-regulated “within minutes of exposure to IL-23,” which promotes signaling and cytokine secretion, the investigators wrote. However, the extent to which IL-23 supports macrophage antimicrobial activity was unknown. To characterize protein expression, signaling, and bacterial uptake and clearance of bacteria by human macrophages derived from monocytes, the investigators tested these cells with Western blot, flow cytometry, and gentamicin protection, which involved coculturing human macrophages with bacteria, adding gentamicin solution, and then lysing and plating the cells onto agar to assess the extent to which the macrophages had taken up the bacteria.

After 48 hours of exposure to IL-23 or IL-12, macrophages increased their intracellular clearance of clinically relevant bacteria, including Enterococcus faecalis, adherent invasive Escherichia coli, and Salmonella typhimurium. Notably, this did not occur when the investigators reduced (“knocked down”) macrophage expression of either IL-23R or IL-12 receptor alpha 2. Additional investigations showed that in macrophages, IL-23 promotes bacterial uptake, clearance, and autophagy by inducing a pyruvate dehydrogenase kinase 1 (PDK1)–dependent pathway mediated by Janus kinase 2/tyrosine kinase 2 and by inducing reactive oxygen species (ROS) and reactive nitrogen species (RNS) pathways. IL-23 also activates two key proteins involved in autophagy (ATG5 and ATG16L1), the researchers reported. “ROS, RNS, and autophagy cooperate to mediate IL-23-induced bacterial clearance. Reduction of each ROS, RNS, and autophagy pathway partially reversed the enhanced bacterial clearance observed with chronic IL-23 treatment.”

Further tests found that IL-23 mediates antimicrobial pathways through the Janus kinase 2, tyrosine kinase 2, and STAT3 pathways, which “cooperate to mediate optimal IL-23-induced intracellular bacterial clearance in human macrophages.” Importantly, human macrophages showed less antimicrobial activity when transfected with the IL-23R–Q381 variant than with IL-23R–R381. The IL-23R-Q381 variant, which reduces susceptibility to IBD, “decreased IL-23-induced and NOD2-induced antimicrobial pathways and intracellular bacterial clearance in monocyte-derived macrophages,” the researchers explained. Evaluating actual carriers of these variants showed the same results – macrophages harboring IBD-protective IL-23R–R381/Q381 exhibited lower antimicrobial activity and less intracellular bacterial clearance compared with macrophages from carriers of IL-23R–R381/R381.

“Taken together, IL-23 promotes increased bacterial uptake and then induces a more rapid and effective clearance of these intracellular bacteria in human monocyte-derived macrophages,” the researchers wrote. “The reduced inflammatory responses observed in IL-23R Q381 carriers are associated with protection from multiple immune-mediated diseases. This would imply that loss-of-function observed with the common IL-23R–R381Q variant may lead to a disadvantage in select infectious diseases, including through [this variant’s] now identified role in promoting antimicrobial pathways in macrophages.”

The National Institutes of Health provided funding. The investigators reported having no conflicts of interest.

SOURCE: Sun R, Abraham C. Cell Molec Gastro Hepatol. 2020 May 28. doi.: 10.1016/j.jcmgh.2020.05.007.

Budesonide orodispersible tablets maintained remissions of eosinophilic esophagitis for 48 weeks in approximately 75% of patients and did not increase the risk for most adverse events, compared with placebo, according to the findings of a multicenter, randomized, double-blind trial.

While prior studies have shown that swallowed topical corticosteroids such as budesonide or fluticasone induce remission in EoE, this is the first multicenter phase 3 study of budesonide orodispersible tablets (BOTs) for maintaining remissions over the long term, wrote Alex Straumann, MD, of the Swiss EoE Research Group and University Hospital Zurich, and associates in Gastroenterology.

Eosinophilic esophagitis is the most common cause of esophageal dysphagia and food impaction. Swallowed topical corticosteroids improve symptoms and inflammation, but the off-label use of formulations developed for airway administration in asthma shows “suboptimal esophageal targeting and efficacy,” the researchers wrote. In the phase 3 EOS-2 trial, twice-daily treatment with 1.0 mg BOTs had induced clinicohistologic remissions in 58% of adults with EoE at 6 weeks and in 85% at 12 weeks.

To study long-term maintenance BOT therapy, the researchers randomly assigned 204 of the remitted patients to 48 weeks of twice-daily BOT 0.5 mg, BOT 1.0 mg, or placebo. There were 68 patients per group. A total of 141 patients completed this double-blind phase, but all 204 were evaluable for the primary analysis. The primary outcome was remission at week 48, defined as freedom from relapse (dysphagia or odynophagia rated as 4 or higher on a 10-point numeric rating scale), histologic relapse (≥48 eosinophils per mm² high-power field), food impaction requiring endoscopic intervention, and dilation.

After 48 weeks, 51 patients in the 1-mg group (75%) and 50 patients in the 0.5-mg group (73.5%) remained in remission, compared with only three patients in the placebo group (4.4%; both P less than .0001). Patients in the placebo group relapsed after a median of 87 days off BOTs. Overall, BOT therapy was similarly efficacious regardless of factors such as history of allergic diseases, location of inflammation at the start of induction, or concomitant use of proton pump inhibitors. However, patients with inflammation of all three esophageal segments achieved “clinically relevant” greater rates of remission with twice-daily 1.0-mg BOT, compared with twice-daily 0.5-mg BOT (80% vs. 68%). In secondary analyses, rates of histologic relapse were 13.2% with 0.5-mg BOT twice daily, 10.3% with 1.0-mg BOT twice daily, and 90% with placebo, and rates of clinical relapse were 10.3%, 7.4%, and 60.3%, respectively. “Histological remission in the BOT 0.5 and 1.0mg twice daily group was independently maintained in all esophageal segments,” the researchers reported.

Rates of most adverse events were similar across treatment groups, and no serious treatment-emergent adverse events were reported. Average morning serum cortisol levels were similar among groups and did not change after treatment ended, but four patients on BOT therapy developed asymptomatic subnormal levels of morning cortisol. “Clinically manifested candidiasis was suspected in 16.2% of patients in the BOT 0.5mg group and in 11.8% of patients in the BOT 1.0mg group; all infections resolved with treatment,” the researchers wrote.

The study and editorial support were funded by Dr. Falk Pharma GmbH, a pharmaceutical company in Germany. Dr. Falk Pharma was involved in the study design and data collection, analysis, and interpretation. Dr. Straumann disclosed fees from several pharmaceutical companies, including Dr. Falk Pharma and AstraZeneca, which makes budesonide. Several other coinvestigators also disclosed ties to Dr. Falk Pharma, AstraZeneca, and other pharmaceutical companies.

SOURCE: Straumann A et al. Gastroenterology. 2020 July 25. doi: 10.1053/j.gastro.2020.07.039.

Budesonide orodispersible tablets maintained remissions of eosinophilic esophagitis for 48 weeks in approximately 75% of patients and did not increase the risk for most adverse events, compared with placebo, according to the findings of a multicenter, randomized, double-blind trial.

While prior studies have shown that swallowed topical corticosteroids such as budesonide or fluticasone induce remission in EoE, this is the first multicenter phase 3 study of budesonide orodispersible tablets (BOTs) for maintaining remissions over the long term, wrote Alex Straumann, MD, of the Swiss EoE Research Group and University Hospital Zurich, and associates in Gastroenterology.

Eosinophilic esophagitis is the most common cause of esophageal dysphagia and food impaction. Swallowed topical corticosteroids improve symptoms and inflammation, but the off-label use of formulations developed for airway administration in asthma shows “suboptimal esophageal targeting and efficacy,” the researchers wrote. In the phase 3 EOS-2 trial, twice-daily treatment with 1.0 mg BOTs had induced clinicohistologic remissions in 58% of adults with EoE at 6 weeks and in 85% at 12 weeks.

To study long-term maintenance BOT therapy, the researchers randomly assigned 204 of the remitted patients to 48 weeks of twice-daily BOT 0.5 mg, BOT 1.0 mg, or placebo. There were 68 patients per group. A total of 141 patients completed this double-blind phase, but all 204 were evaluable for the primary analysis. The primary outcome was remission at week 48, defined as freedom from relapse (dysphagia or odynophagia rated as 4 or higher on a 10-point numeric rating scale), histologic relapse (≥48 eosinophils per mm² high-power field), food impaction requiring endoscopic intervention, and dilation.

After 48 weeks, 51 patients in the 1-mg group (75%) and 50 patients in the 0.5-mg group (73.5%) remained in remission, compared with only three patients in the placebo group (4.4%; both P less than .0001). Patients in the placebo group relapsed after a median of 87 days off BOTs. Overall, BOT therapy was similarly efficacious regardless of factors such as history of allergic diseases, location of inflammation at the start of induction, or concomitant use of proton pump inhibitors. However, patients with inflammation of all three esophageal segments achieved “clinically relevant” greater rates of remission with twice-daily 1.0-mg BOT, compared with twice-daily 0.5-mg BOT (80% vs. 68%). In secondary analyses, rates of histologic relapse were 13.2% with 0.5-mg BOT twice daily, 10.3% with 1.0-mg BOT twice daily, and 90% with placebo, and rates of clinical relapse were 10.3%, 7.4%, and 60.3%, respectively. “Histological remission in the BOT 0.5 and 1.0mg twice daily group was independently maintained in all esophageal segments,” the researchers reported.

Rates of most adverse events were similar across treatment groups, and no serious treatment-emergent adverse events were reported. Average morning serum cortisol levels were similar among groups and did not change after treatment ended, but four patients on BOT therapy developed asymptomatic subnormal levels of morning cortisol. “Clinically manifested candidiasis was suspected in 16.2% of patients in the BOT 0.5mg group and in 11.8% of patients in the BOT 1.0mg group; all infections resolved with treatment,” the researchers wrote.

The study and editorial support were funded by Dr. Falk Pharma GmbH, a pharmaceutical company in Germany. Dr. Falk Pharma was involved in the study design and data collection, analysis, and interpretation. Dr. Straumann disclosed fees from several pharmaceutical companies, including Dr. Falk Pharma and AstraZeneca, which makes budesonide. Several other coinvestigators also disclosed ties to Dr. Falk Pharma, AstraZeneca, and other pharmaceutical companies.

SOURCE: Straumann A et al. Gastroenterology. 2020 July 25. doi: 10.1053/j.gastro.2020.07.039.

Budesonide orodispersible tablets maintained remissions of eosinophilic esophagitis for 48 weeks in approximately 75% of patients and did not increase the risk for most adverse events, compared with placebo, according to the findings of a multicenter, randomized, double-blind trial.

While prior studies have shown that swallowed topical corticosteroids such as budesonide or fluticasone induce remission in EoE, this is the first multicenter phase 3 study of budesonide orodispersible tablets (BOTs) for maintaining remissions over the long term, wrote Alex Straumann, MD, of the Swiss EoE Research Group and University Hospital Zurich, and associates in Gastroenterology.

Eosinophilic esophagitis is the most common cause of esophageal dysphagia and food impaction. Swallowed topical corticosteroids improve symptoms and inflammation, but the off-label use of formulations developed for airway administration in asthma shows “suboptimal esophageal targeting and efficacy,” the researchers wrote. In the phase 3 EOS-2 trial, twice-daily treatment with 1.0 mg BOTs had induced clinicohistologic remissions in 58% of adults with EoE at 6 weeks and in 85% at 12 weeks.

To study long-term maintenance BOT therapy, the researchers randomly assigned 204 of the remitted patients to 48 weeks of twice-daily BOT 0.5 mg, BOT 1.0 mg, or placebo. There were 68 patients per group. A total of 141 patients completed this double-blind phase, but all 204 were evaluable for the primary analysis. The primary outcome was remission at week 48, defined as freedom from relapse (dysphagia or odynophagia rated as 4 or higher on a 10-point numeric rating scale), histologic relapse (≥48 eosinophils per mm² high-power field), food impaction requiring endoscopic intervention, and dilation.

After 48 weeks, 51 patients in the 1-mg group (75%) and 50 patients in the 0.5-mg group (73.5%) remained in remission, compared with only three patients in the placebo group (4.4%; both P less than .0001). Patients in the placebo group relapsed after a median of 87 days off BOTs. Overall, BOT therapy was similarly efficacious regardless of factors such as history of allergic diseases, location of inflammation at the start of induction, or concomitant use of proton pump inhibitors. However, patients with inflammation of all three esophageal segments achieved “clinically relevant” greater rates of remission with twice-daily 1.0-mg BOT, compared with twice-daily 0.5-mg BOT (80% vs. 68%). In secondary analyses, rates of histologic relapse were 13.2% with 0.5-mg BOT twice daily, 10.3% with 1.0-mg BOT twice daily, and 90% with placebo, and rates of clinical relapse were 10.3%, 7.4%, and 60.3%, respectively. “Histological remission in the BOT 0.5 and 1.0mg twice daily group was independently maintained in all esophageal segments,” the researchers reported.

Rates of most adverse events were similar across treatment groups, and no serious treatment-emergent adverse events were reported. Average morning serum cortisol levels were similar among groups and did not change after treatment ended, but four patients on BOT therapy developed asymptomatic subnormal levels of morning cortisol. “Clinically manifested candidiasis was suspected in 16.2% of patients in the BOT 0.5mg group and in 11.8% of patients in the BOT 1.0mg group; all infections resolved with treatment,” the researchers wrote.

The study and editorial support were funded by Dr. Falk Pharma GmbH, a pharmaceutical company in Germany. Dr. Falk Pharma was involved in the study design and data collection, analysis, and interpretation. Dr. Straumann disclosed fees from several pharmaceutical companies, including Dr. Falk Pharma and AstraZeneca, which makes budesonide. Several other coinvestigators also disclosed ties to Dr. Falk Pharma, AstraZeneca, and other pharmaceutical companies.

SOURCE: Straumann A et al. Gastroenterology. 2020 July 25. doi: 10.1053/j.gastro.2020.07.039.

Diarrhea affected one in every five patients with inflammatory bowel disease (IBD) and COVID-19, compared with only 7%-10% of all patients with COVID-19 in prior studies, researchers reported in Clinical Gastroenterology and Hepatology.

In a systematic review and meta-analysis of 23 studies incorporating data from 449 patients with IBD and COVID-19, their most common symptoms were fever (affecting 48.3% of patients), cough (46.5%), and diarrhea (20.5%), and diarrhea was approximately twice as prevalent as dyspnea, nausea, abdominal pain, and fatigue, wrote Ferdinando D’Amico of Humanitas University in Milan and his associates. “[S]ymptoms experienced by IBD patients with COVID-19 are similar to those occurring in the general population, except for a higher percentage of diarrhea,” they wrote. This increased prevalence might result from IBD itself or from inflammatory effects of viral gut tropism, they noted. “Currently, the diagnostic–therapeutic approach does not differ between IBD and non-IBD patients, but further studies are needed to evaluate whether fecal research of viral RNA and treatment with IBD drugs may play a role in the management of COVID-19 patients.”

To characterize the clinical presentation and course of patients with IBD and COVID-19, the researchers searched PubMed, Embase, Web of Science, and MedRxiv through July 29, 2020, for keywords related to COVID-19, Crohn’s disease, ulcerative colitis, and IBD. They identified 23 studies presenting clinical data from adults or children with a confirmed IBD diagnosis and least one case of COVID-19. Among 243,760 patients with IBD, 1,028 patients had COVID-19 infection, including 509 patients with Crohn’s disease, 428 patients with ulcerative colitis, 49 patients with indeterminate colitis, and 42 patients for whom the IBD subtype was not recorded.

In all, 0.4% of patients with IBD had COVID-19. Nearly all had been diagnosed by polymerase chain reaction of nasopharyngeal swabs, and approximately 40% also had received chest CT scans. Most were male (56.5%), and 43.5% were older than 65 years. Patients were receiving a wide range of IBD therapies, most commonly anti–tumor necrosis factor (TNF) agents, mesalamine, thiopurine (alone or in combination with biologics), vedolizumab, ustekinumab, steroids, methotrexate, and tofacitinib. Results from six studies indicated that patients with IBD were significantly more likely to be diagnosed with COVID-19 if they were older than 66 years (odds ratio, 21.3) or had other comorbidities (OR, 1.24). The most commonly used drugs for managing COVID-19 were hydroxychloroquine, lopinavir/ritonavir, steroids, antibiotics, chloroquine, tofacitinib, and infliximab.

A total of 30.6% of patients with IBD and COVID-19 were hospitalized, 11.4% stayed in the ICU, 3.7% required mechanical ventilation, and 3.8% died from COVID-19. Significant risk factors for death from COVID-19 included older age, active IBD, and a Charlson Comorbidity Index score above 1. Similarly, risk factors for severe COVID-19 included older age, having two or more comorbidities, receiving systemic steroids, and receiving mesalamine/sulfasalazine. In one study, a recent (3-month) history of corticosteroid treatment was associated with a 60% increase in the risk for severe COVID-19. Other immune-mediated therapies did not show this association. Patients with ulcerative colitis were significantly more likely to be seen in the ED or hospitalized, compared with patients with other forms of IBD (adjusted OR, 12.7).

No funding sources were disclosed. Dr. D’Amico reported having no conflicts of interest. Two coinvestigators disclosed ties to AbbVie, MSD, Schering-Plough, UCB Pharma, and several other pharmaceutical companies.

SOURCE: D’Amico F et al. Clin Gastroenterol Hepatol. 2020 Aug 7. doi: 10.1016/j.cgh.2020.08.003.
 

Diarrhea affected one in every five patients with inflammatory bowel disease (IBD) and COVID-19, compared with only 7%-10% of all patients with COVID-19 in prior studies, researchers reported in Clinical Gastroenterology and Hepatology.

In a systematic review and meta-analysis of 23 studies incorporating data from 449 patients with IBD and COVID-19, their most common symptoms were fever (affecting 48.3% of patients), cough (46.5%), and diarrhea (20.5%), and diarrhea was approximately twice as prevalent as dyspnea, nausea, abdominal pain, and fatigue, wrote Ferdinando D’Amico of Humanitas University in Milan and his associates. “[S]ymptoms experienced by IBD patients with COVID-19 are similar to those occurring in the general population, except for a higher percentage of diarrhea,” they wrote. This increased prevalence might result from IBD itself or from inflammatory effects of viral gut tropism, they noted. “Currently, the diagnostic–therapeutic approach does not differ between IBD and non-IBD patients, but further studies are needed to evaluate whether fecal research of viral RNA and treatment with IBD drugs may play a role in the management of COVID-19 patients.”

To characterize the clinical presentation and course of patients with IBD and COVID-19, the researchers searched PubMed, Embase, Web of Science, and MedRxiv through July 29, 2020, for keywords related to COVID-19, Crohn’s disease, ulcerative colitis, and IBD. They identified 23 studies presenting clinical data from adults or children with a confirmed IBD diagnosis and least one case of COVID-19. Among 243,760 patients with IBD, 1,028 patients had COVID-19 infection, including 509 patients with Crohn’s disease, 428 patients with ulcerative colitis, 49 patients with indeterminate colitis, and 42 patients for whom the IBD subtype was not recorded.

In all, 0.4% of patients with IBD had COVID-19. Nearly all had been diagnosed by polymerase chain reaction of nasopharyngeal swabs, and approximately 40% also had received chest CT scans. Most were male (56.5%), and 43.5% were older than 65 years. Patients were receiving a wide range of IBD therapies, most commonly anti–tumor necrosis factor (TNF) agents, mesalamine, thiopurine (alone or in combination with biologics), vedolizumab, ustekinumab, steroids, methotrexate, and tofacitinib. Results from six studies indicated that patients with IBD were significantly more likely to be diagnosed with COVID-19 if they were older than 66 years (odds ratio, 21.3) or had other comorbidities (OR, 1.24). The most commonly used drugs for managing COVID-19 were hydroxychloroquine, lopinavir/ritonavir, steroids, antibiotics, chloroquine, tofacitinib, and infliximab.

A total of 30.6% of patients with IBD and COVID-19 were hospitalized, 11.4% stayed in the ICU, 3.7% required mechanical ventilation, and 3.8% died from COVID-19. Significant risk factors for death from COVID-19 included older age, active IBD, and a Charlson Comorbidity Index score above 1. Similarly, risk factors for severe COVID-19 included older age, having two or more comorbidities, receiving systemic steroids, and receiving mesalamine/sulfasalazine. In one study, a recent (3-month) history of corticosteroid treatment was associated with a 60% increase in the risk for severe COVID-19. Other immune-mediated therapies did not show this association. Patients with ulcerative colitis were significantly more likely to be seen in the ED or hospitalized, compared with patients with other forms of IBD (adjusted OR, 12.7).

No funding sources were disclosed. Dr. D’Amico reported having no conflicts of interest. Two coinvestigators disclosed ties to AbbVie, MSD, Schering-Plough, UCB Pharma, and several other pharmaceutical companies.

SOURCE: D’Amico F et al. Clin Gastroenterol Hepatol. 2020 Aug 7. doi: 10.1016/j.cgh.2020.08.003.
 

Diarrhea affected one in every five patients with inflammatory bowel disease (IBD) and COVID-19, compared with only 7%-10% of all patients with COVID-19 in prior studies, researchers reported in Clinical Gastroenterology and Hepatology.

In a systematic review and meta-analysis of 23 studies incorporating data from 449 patients with IBD and COVID-19, their most common symptoms were fever (affecting 48.3% of patients), cough (46.5%), and diarrhea (20.5%), and diarrhea was approximately twice as prevalent as dyspnea, nausea, abdominal pain, and fatigue, wrote Ferdinando D’Amico of Humanitas University in Milan and his associates. “[S]ymptoms experienced by IBD patients with COVID-19 are similar to those occurring in the general population, except for a higher percentage of diarrhea,” they wrote. This increased prevalence might result from IBD itself or from inflammatory effects of viral gut tropism, they noted. “Currently, the diagnostic–therapeutic approach does not differ between IBD and non-IBD patients, but further studies are needed to evaluate whether fecal research of viral RNA and treatment with IBD drugs may play a role in the management of COVID-19 patients.”

To characterize the clinical presentation and course of patients with IBD and COVID-19, the researchers searched PubMed, Embase, Web of Science, and MedRxiv through July 29, 2020, for keywords related to COVID-19, Crohn’s disease, ulcerative colitis, and IBD. They identified 23 studies presenting clinical data from adults or children with a confirmed IBD diagnosis and least one case of COVID-19. Among 243,760 patients with IBD, 1,028 patients had COVID-19 infection, including 509 patients with Crohn’s disease, 428 patients with ulcerative colitis, 49 patients with indeterminate colitis, and 42 patients for whom the IBD subtype was not recorded.

In all, 0.4% of patients with IBD had COVID-19. Nearly all had been diagnosed by polymerase chain reaction of nasopharyngeal swabs, and approximately 40% also had received chest CT scans. Most were male (56.5%), and 43.5% were older than 65 years. Patients were receiving a wide range of IBD therapies, most commonly anti–tumor necrosis factor (TNF) agents, mesalamine, thiopurine (alone or in combination with biologics), vedolizumab, ustekinumab, steroids, methotrexate, and tofacitinib. Results from six studies indicated that patients with IBD were significantly more likely to be diagnosed with COVID-19 if they were older than 66 years (odds ratio, 21.3) or had other comorbidities (OR, 1.24). The most commonly used drugs for managing COVID-19 were hydroxychloroquine, lopinavir/ritonavir, steroids, antibiotics, chloroquine, tofacitinib, and infliximab.

A total of 30.6% of patients with IBD and COVID-19 were hospitalized, 11.4% stayed in the ICU, 3.7% required mechanical ventilation, and 3.8% died from COVID-19. Significant risk factors for death from COVID-19 included older age, active IBD, and a Charlson Comorbidity Index score above 1. Similarly, risk factors for severe COVID-19 included older age, having two or more comorbidities, receiving systemic steroids, and receiving mesalamine/sulfasalazine. In one study, a recent (3-month) history of corticosteroid treatment was associated with a 60% increase in the risk for severe COVID-19. Other immune-mediated therapies did not show this association. Patients with ulcerative colitis were significantly more likely to be seen in the ED or hospitalized, compared with patients with other forms of IBD (adjusted OR, 12.7).

No funding sources were disclosed. Dr. D’Amico reported having no conflicts of interest. Two coinvestigators disclosed ties to AbbVie, MSD, Schering-Plough, UCB Pharma, and several other pharmaceutical companies.

SOURCE: D’Amico F et al. Clin Gastroenterol Hepatol. 2020 Aug 7. doi: 10.1016/j.cgh.2020.08.003.
 

For patients with severe thrombocytopenia and chronic liver diseases, including hepatocellular carcinoma, treatment with lusutrombopag prior to invasive procedures significantly decreased the need for platelet transfusions without increasing the need for rescue treatment for bleeding or the rate of thromboembolic events.

In a post hoc analysis of data from 270 patients in two manufacturer-sponsored, multicenter, randomized, double-blind, placebo-controlled, phase 3 trials, significantly more lusutrombopag recipients met the primary efficacy endpoint, including patients with hepatocellular carcinoma (68.0% vs. 8.9% in the placebo group; P < .0001) and those without it (77.0% vs. 21.6%; P < .0001). Rates of treatment-emergent adverse events were similar between the lusutrombopag and placebo groups, and patients with hepatocellular carcinoma were not at increased risk for thrombosis, Naim Alkhouri, MD, of Texas Liver Institute in San Antonio, and associates wrote in Clinical Gastroenterology and Hepatology.

Platelet transfusion is the treatment mainstay for patients with thrombocytopenia related to cirrhosis who are undergoing invasive procedures, but its effects are short-lived, and at least one in five transfusions fails. Thrombopoietin agonists such as lusutrombopag are efficacious and approved in this setting, but they can be prothrombotic, particularly in patients with hepatocellular carcinoma, who already are at heightened risk for portal vein thrombosis.

Dr. Alkhouri and associates performed an integrated analysis of the PLUS 1 trial (Japan, October 2013–May 2014) and the L-PLUS 2 (global, June 2015–April 2017). Participants were adults with Child-Pugh Class A or B chronic liver disease and baseline platelet counts under 50 x 10⁹ per L who were scheduled for invasive procedures. Of the 270 patients, 95 had hepatocellular carcinoma. Patients were randomly assigned on a one-to-one basis to receive either lusutrombopag (3 mg) or placebo daily for up to 7 days before procedures. The primary endpoint was the percentage of patients in the per-protocol population who did not need a platelet transfusion before the invasive procedure or rescue therapy within 7 days afterward.

The treatment and placebo arms were similar except that patients with hepatocellular carcinoma were about 10 years older on average. In patients with hepatocellular carcinoma, 60.5% more lusutrombopag recipients than placebo recipients met the primary endpoint, and rates of bleeding-related adverse events were 9.1% and 15.7%, respectively. In patients with other chronic liver diseases, 52.6% more lusutrombopag recipients met the primary endpoint. Rates of bleeding-related adverse events were 5% and 10.6%.

“Approximately 88% of patients with hepatocellular carcinoma underwent a liver-related procedure, compared with approximately 10% of patients without hepatocellular carcinoma,” the investigators wrote. “This is significant because ablations or transcatheter arterial chemoembolizations can be associated with serious bleeding complications. It is clinically important that, given the greater number of liver-related procedures, the incidence of bleeding-related adverse events was lower in patients treated with lusutrombopag than placebo.”

Imaging after the procedures confirmed low rates of thromboses in both groups and subgroups. Four patients developed portal vein thromboses, including two lusutrombopag recipients (one of whom had hepatocellular carcinoma) and two placebo recipients without hepatocellular carcinoma.

These trials excluded patients undergoing major surgical procedures and those with decompensated cirrhosis; portal vein thrombosis; hematopoietic tumors; aplastic anemia; myelodysplastic syndrome; myelofibrosis; liver transplantation; splenectomy; and thrombocytopenia that was congenital, autoimmune, or drug induced. “A limitation of this study was the high rate of protocol violations related to platelet transfusions,” the researchers noted. “A number of patients [42 in all] were excluded from the per-protocol population owing to receipt of unnecessary platelet transfusions, or because they did not receive a needed platelet transfusion.”Shionogi makes lusutrombopag and sponsored the study. Dr. Alkhouri reported an advisory relationship with Shionogi and Dova Pharma. Two coinvestigators reported being employed by Shionogi. Three coinvestigators also disclosed ties to Shionogi and to several other pharmaceutical companies.

SOURCE: Alkhouri N et al. Clin Gastroenterol Hepatol. 2020 Mar 20. doi: 10.1016/j.cgh.2020.03.032.

For patients with severe thrombocytopenia and chronic liver diseases, including hepatocellular carcinoma, treatment with lusutrombopag prior to invasive procedures significantly decreased the need for platelet transfusions without increasing the need for rescue treatment for bleeding or the rate of thromboembolic events.

In a post hoc analysis of data from 270 patients in two manufacturer-sponsored, multicenter, randomized, double-blind, placebo-controlled, phase 3 trials, significantly more lusutrombopag recipients met the primary efficacy endpoint, including patients with hepatocellular carcinoma (68.0% vs. 8.9% in the placebo group; P < .0001) and those without it (77.0% vs. 21.6%; P < .0001). Rates of treatment-emergent adverse events were similar between the lusutrombopag and placebo groups, and patients with hepatocellular carcinoma were not at increased risk for thrombosis, Naim Alkhouri, MD, of Texas Liver Institute in San Antonio, and associates wrote in Clinical Gastroenterology and Hepatology.

Platelet transfusion is the treatment mainstay for patients with thrombocytopenia related to cirrhosis who are undergoing invasive procedures, but its effects are short-lived, and at least one in five transfusions fails. Thrombopoietin agonists such as lusutrombopag are efficacious and approved in this setting, but they can be prothrombotic, particularly in patients with hepatocellular carcinoma, who already are at heightened risk for portal vein thrombosis.

Dr. Alkhouri and associates performed an integrated analysis of the PLUS 1 trial (Japan, October 2013–May 2014) and the L-PLUS 2 (global, June 2015–April 2017). Participants were adults with Child-Pugh Class A or B chronic liver disease and baseline platelet counts under 50 x 10⁹ per L who were scheduled for invasive procedures. Of the 270 patients, 95 had hepatocellular carcinoma. Patients were randomly assigned on a one-to-one basis to receive either lusutrombopag (3 mg) or placebo daily for up to 7 days before procedures. The primary endpoint was the percentage of patients in the per-protocol population who did not need a platelet transfusion before the invasive procedure or rescue therapy within 7 days afterward.

The treatment and placebo arms were similar except that patients with hepatocellular carcinoma were about 10 years older on average. In patients with hepatocellular carcinoma, 60.5% more lusutrombopag recipients than placebo recipients met the primary endpoint, and rates of bleeding-related adverse events were 9.1% and 15.7%, respectively. In patients with other chronic liver diseases, 52.6% more lusutrombopag recipients met the primary endpoint. Rates of bleeding-related adverse events were 5% and 10.6%.

“Approximately 88% of patients with hepatocellular carcinoma underwent a liver-related procedure, compared with approximately 10% of patients without hepatocellular carcinoma,” the investigators wrote. “This is significant because ablations or transcatheter arterial chemoembolizations can be associated with serious bleeding complications. It is clinically important that, given the greater number of liver-related procedures, the incidence of bleeding-related adverse events was lower in patients treated with lusutrombopag than placebo.”

Imaging after the procedures confirmed low rates of thromboses in both groups and subgroups. Four patients developed portal vein thromboses, including two lusutrombopag recipients (one of whom had hepatocellular carcinoma) and two placebo recipients without hepatocellular carcinoma.

These trials excluded patients undergoing major surgical procedures and those with decompensated cirrhosis; portal vein thrombosis; hematopoietic tumors; aplastic anemia; myelodysplastic syndrome; myelofibrosis; liver transplantation; splenectomy; and thrombocytopenia that was congenital, autoimmune, or drug induced. “A limitation of this study was the high rate of protocol violations related to platelet transfusions,” the researchers noted. “A number of patients [42 in all] were excluded from the per-protocol population owing to receipt of unnecessary platelet transfusions, or because they did not receive a needed platelet transfusion.”Shionogi makes lusutrombopag and sponsored the study. Dr. Alkhouri reported an advisory relationship with Shionogi and Dova Pharma. Two coinvestigators reported being employed by Shionogi. Three coinvestigators also disclosed ties to Shionogi and to several other pharmaceutical companies.

SOURCE: Alkhouri N et al. Clin Gastroenterol Hepatol. 2020 Mar 20. doi: 10.1016/j.cgh.2020.03.032.

For patients with severe thrombocytopenia and chronic liver diseases, including hepatocellular carcinoma, treatment with lusutrombopag prior to invasive procedures significantly decreased the need for platelet transfusions without increasing the need for rescue treatment for bleeding or the rate of thromboembolic events.

In a post hoc analysis of data from 270 patients in two manufacturer-sponsored, multicenter, randomized, double-blind, placebo-controlled, phase 3 trials, significantly more lusutrombopag recipients met the primary efficacy endpoint, including patients with hepatocellular carcinoma (68.0% vs. 8.9% in the placebo group; P < .0001) and those without it (77.0% vs. 21.6%; P < .0001). Rates of treatment-emergent adverse events were similar between the lusutrombopag and placebo groups, and patients with hepatocellular carcinoma were not at increased risk for thrombosis, Naim Alkhouri, MD, of Texas Liver Institute in San Antonio, and associates wrote in Clinical Gastroenterology and Hepatology.

Platelet transfusion is the treatment mainstay for patients with thrombocytopenia related to cirrhosis who are undergoing invasive procedures, but its effects are short-lived, and at least one in five transfusions fails. Thrombopoietin agonists such as lusutrombopag are efficacious and approved in this setting, but they can be prothrombotic, particularly in patients with hepatocellular carcinoma, who already are at heightened risk for portal vein thrombosis.

Dr. Alkhouri and associates performed an integrated analysis of the PLUS 1 trial (Japan, October 2013–May 2014) and the L-PLUS 2 (global, June 2015–April 2017). Participants were adults with Child-Pugh Class A or B chronic liver disease and baseline platelet counts under 50 x 10⁹ per L who were scheduled for invasive procedures. Of the 270 patients, 95 had hepatocellular carcinoma. Patients were randomly assigned on a one-to-one basis to receive either lusutrombopag (3 mg) or placebo daily for up to 7 days before procedures. The primary endpoint was the percentage of patients in the per-protocol population who did not need a platelet transfusion before the invasive procedure or rescue therapy within 7 days afterward.

The treatment and placebo arms were similar except that patients with hepatocellular carcinoma were about 10 years older on average. In patients with hepatocellular carcinoma, 60.5% more lusutrombopag recipients than placebo recipients met the primary endpoint, and rates of bleeding-related adverse events were 9.1% and 15.7%, respectively. In patients with other chronic liver diseases, 52.6% more lusutrombopag recipients met the primary endpoint. Rates of bleeding-related adverse events were 5% and 10.6%.

“Approximately 88% of patients with hepatocellular carcinoma underwent a liver-related procedure, compared with approximately 10% of patients without hepatocellular carcinoma,” the investigators wrote. “This is significant because ablations or transcatheter arterial chemoembolizations can be associated with serious bleeding complications. It is clinically important that, given the greater number of liver-related procedures, the incidence of bleeding-related adverse events was lower in patients treated with lusutrombopag than placebo.”

Imaging after the procedures confirmed low rates of thromboses in both groups and subgroups. Four patients developed portal vein thromboses, including two lusutrombopag recipients (one of whom had hepatocellular carcinoma) and two placebo recipients without hepatocellular carcinoma.

These trials excluded patients undergoing major surgical procedures and those with decompensated cirrhosis; portal vein thrombosis; hematopoietic tumors; aplastic anemia; myelodysplastic syndrome; myelofibrosis; liver transplantation; splenectomy; and thrombocytopenia that was congenital, autoimmune, or drug induced. “A limitation of this study was the high rate of protocol violations related to platelet transfusions,” the researchers noted. “A number of patients [42 in all] were excluded from the per-protocol population owing to receipt of unnecessary platelet transfusions, or because they did not receive a needed platelet transfusion.”Shionogi makes lusutrombopag and sponsored the study. Dr. Alkhouri reported an advisory relationship with Shionogi and Dova Pharma. Two coinvestigators reported being employed by Shionogi. Three coinvestigators also disclosed ties to Shionogi and to several other pharmaceutical companies.

SOURCE: Alkhouri N et al. Clin Gastroenterol Hepatol. 2020 Mar 20. doi: 10.1016/j.cgh.2020.03.032.

Unexplained diarrhea may be the most reliable symptom of small intestinal bacterial overgrowth (SIBO) in at-risk patients, according to a new clinical practice update from the American Gastroenterological Association.

“In those predisposed to SIBO due to anatomical, pathological, pharmacological or other changes that promote stasis or recirculation of colonic contents and/or impaired resistance to bacteria, SIBO will lead to diarrhea and can progress to a full-blown malabsorption syndrome” marked by steatorrhea and vitamin deficiencies, wrote Eamonn M.M. Quigley, MD, of Houston Methodist Hospital and Weill Cornell Medical College in Houston together with his fellow experts in Gastroenterology. But malabsorption is uncommon in patients whose SIBO is not caused by structural abnormalities, and gastrointestinal symptoms are “weakly predictive at best” if patients lack clear risk factors for SIBO, the experts cautioned.

The growing availability of breath testing has fueled diagnoses of SIBO, which the lay press often implicates in various disorders even though SIBO has no clear clinical or laboratory definition. Recent progress in techniques to measure bacterial populations and their metabolic products “should provide much needed clarity,” but for now, a SIBO diagnosis simply means that a patient’s presenting symptoms or laboratory findings are attributed to bacterial changes in the small intestine, the experts wrote.

Detecting SIBO also remains challenging. Most patients have normal results on routine laboratory tests, and there is not enough evidence to support testing for inflammatory markers such as fecal calprotectin. Patients with SIBO may have increased folate levels because of bacterial production of folic acid. Vitamin B₁₂ and other nutrient deficiencies also occur but are less common. The preferred diagnostic method is culture of a duodenal aspirate, and recent research supports a cutoff value of greater than 10³ CFUs of coliform bacteria per mL. Breath testing is less invasive but “more complex than simply measuring hydrogen,” the experts stressed. Methane-producing microorganisms (methanogens) suppress hydrogen on a breath test (fortunately, standard breath tests measure methane). Furthermore, a positive methane breath test also has been linked to constipation-predominant irritable bowel syndrome (IBS). Recent studies also suggest that lactulose breath testing is more sensitive than glucose for identifying SIBO in patients with IBS.

Antibiotic therapy is the treatment mainstay but remains largely empiric. The goal is to improve SIBO symptoms, not eradicate bacteria from the small intestine. Ideally, the antimicrobial regimen should cover both aerobic and anaerobic bacteria, but clinicians should be mindful of the risks of chronic broad-spectrum antibiotic exposure. In studies, a single 7- to 10-day antibiotic course improved symptoms in approximately 45%-90% of patients with SIBO (rates of breath test response were lower). For patients with IBS and SIBO, rifaximin (which is poorly absorbed) produced encouraging results in two phase 3 studies, but most patients did not receive breath testing, the experts noted. Patients with recurrent SIBO symptoms may need multiple courses of antibiotics with specific regimens rotated to help prevent resistance. “Decisions on management should be individualized and also [should factor in] such risks as diarrhea, Clostridiodes difficile infection, intolerance, and cost,” the experts wrote. “It is not necessary to repeat diagnostic tests for SIBO following antibiotic therapy [if] gastrointestinal symptoms respond.”

Dr. Quigley disclosed financial ties to 4D Pharma, Alimentary Health, Allergan, Biocodex, Biomerica, Ironwood, Salix, Takeda, Vibrant, and Zealand. He also disclosed patents with and equity in Alimentary Health. Both of his coauthors also disclosed ties to various pharmaceutical companies.

SOURCE: Quigley EMM et al. Gastroenterology. 2020 Jun 1. doi: 10.1053/j.gastro.2020.06.090.
 

Unexplained diarrhea may be the most reliable symptom of small intestinal bacterial overgrowth (SIBO) in at-risk patients, according to a new clinical practice update from the American Gastroenterological Association.

“In those predisposed to SIBO due to anatomical, pathological, pharmacological or other changes that promote stasis or recirculation of colonic contents and/or impaired resistance to bacteria, SIBO will lead to diarrhea and can progress to a full-blown malabsorption syndrome” marked by steatorrhea and vitamin deficiencies, wrote Eamonn M.M. Quigley, MD, of Houston Methodist Hospital and Weill Cornell Medical College in Houston together with his fellow experts in Gastroenterology. But malabsorption is uncommon in patients whose SIBO is not caused by structural abnormalities, and gastrointestinal symptoms are “weakly predictive at best” if patients lack clear risk factors for SIBO, the experts cautioned.

The growing availability of breath testing has fueled diagnoses of SIBO, which the lay press often implicates in various disorders even though SIBO has no clear clinical or laboratory definition. Recent progress in techniques to measure bacterial populations and their metabolic products “should provide much needed clarity,” but for now, a SIBO diagnosis simply means that a patient’s presenting symptoms or laboratory findings are attributed to bacterial changes in the small intestine, the experts wrote.

Detecting SIBO also remains challenging. Most patients have normal results on routine laboratory tests, and there is not enough evidence to support testing for inflammatory markers such as fecal calprotectin. Patients with SIBO may have increased folate levels because of bacterial production of folic acid. Vitamin B₁₂ and other nutrient deficiencies also occur but are less common. The preferred diagnostic method is culture of a duodenal aspirate, and recent research supports a cutoff value of greater than 10³ CFUs of coliform bacteria per mL. Breath testing is less invasive but “more complex than simply measuring hydrogen,” the experts stressed. Methane-producing microorganisms (methanogens) suppress hydrogen on a breath test (fortunately, standard breath tests measure methane). Furthermore, a positive methane breath test also has been linked to constipation-predominant irritable bowel syndrome (IBS). Recent studies also suggest that lactulose breath testing is more sensitive than glucose for identifying SIBO in patients with IBS.

Antibiotic therapy is the treatment mainstay but remains largely empiric. The goal is to improve SIBO symptoms, not eradicate bacteria from the small intestine. Ideally, the antimicrobial regimen should cover both aerobic and anaerobic bacteria, but clinicians should be mindful of the risks of chronic broad-spectrum antibiotic exposure. In studies, a single 7- to 10-day antibiotic course improved symptoms in approximately 45%-90% of patients with SIBO (rates of breath test response were lower). For patients with IBS and SIBO, rifaximin (which is poorly absorbed) produced encouraging results in two phase 3 studies, but most patients did not receive breath testing, the experts noted. Patients with recurrent SIBO symptoms may need multiple courses of antibiotics with specific regimens rotated to help prevent resistance. “Decisions on management should be individualized and also [should factor in] such risks as diarrhea, Clostridiodes difficile infection, intolerance, and cost,” the experts wrote. “It is not necessary to repeat diagnostic tests for SIBO following antibiotic therapy [if] gastrointestinal symptoms respond.”

Dr. Quigley disclosed financial ties to 4D Pharma, Alimentary Health, Allergan, Biocodex, Biomerica, Ironwood, Salix, Takeda, Vibrant, and Zealand. He also disclosed patents with and equity in Alimentary Health. Both of his coauthors also disclosed ties to various pharmaceutical companies.

SOURCE: Quigley EMM et al. Gastroenterology. 2020 Jun 1. doi: 10.1053/j.gastro.2020.06.090.
 

Unexplained diarrhea may be the most reliable symptom of small intestinal bacterial overgrowth (SIBO) in at-risk patients, according to a new clinical practice update from the American Gastroenterological Association.

“In those predisposed to SIBO due to anatomical, pathological, pharmacological or other changes that promote stasis or recirculation of colonic contents and/or impaired resistance to bacteria, SIBO will lead to diarrhea and can progress to a full-blown malabsorption syndrome” marked by steatorrhea and vitamin deficiencies, wrote Eamonn M.M. Quigley, MD, of Houston Methodist Hospital and Weill Cornell Medical College in Houston together with his fellow experts in Gastroenterology. But malabsorption is uncommon in patients whose SIBO is not caused by structural abnormalities, and gastrointestinal symptoms are “weakly predictive at best” if patients lack clear risk factors for SIBO, the experts cautioned.

The growing availability of breath testing has fueled diagnoses of SIBO, which the lay press often implicates in various disorders even though SIBO has no clear clinical or laboratory definition. Recent progress in techniques to measure bacterial populations and their metabolic products “should provide much needed clarity,” but for now, a SIBO diagnosis simply means that a patient’s presenting symptoms or laboratory findings are attributed to bacterial changes in the small intestine, the experts wrote.

Detecting SIBO also remains challenging. Most patients have normal results on routine laboratory tests, and there is not enough evidence to support testing for inflammatory markers such as fecal calprotectin. Patients with SIBO may have increased folate levels because of bacterial production of folic acid. Vitamin B₁₂ and other nutrient deficiencies also occur but are less common. The preferred diagnostic method is culture of a duodenal aspirate, and recent research supports a cutoff value of greater than 10³ CFUs of coliform bacteria per mL. Breath testing is less invasive but “more complex than simply measuring hydrogen,” the experts stressed. Methane-producing microorganisms (methanogens) suppress hydrogen on a breath test (fortunately, standard breath tests measure methane). Furthermore, a positive methane breath test also has been linked to constipation-predominant irritable bowel syndrome (IBS). Recent studies also suggest that lactulose breath testing is more sensitive than glucose for identifying SIBO in patients with IBS.

Antibiotic therapy is the treatment mainstay but remains largely empiric. The goal is to improve SIBO symptoms, not eradicate bacteria from the small intestine. Ideally, the antimicrobial regimen should cover both aerobic and anaerobic bacteria, but clinicians should be mindful of the risks of chronic broad-spectrum antibiotic exposure. In studies, a single 7- to 10-day antibiotic course improved symptoms in approximately 45%-90% of patients with SIBO (rates of breath test response were lower). For patients with IBS and SIBO, rifaximin (which is poorly absorbed) produced encouraging results in two phase 3 studies, but most patients did not receive breath testing, the experts noted. Patients with recurrent SIBO symptoms may need multiple courses of antibiotics with specific regimens rotated to help prevent resistance. “Decisions on management should be individualized and also [should factor in] such risks as diarrhea, Clostridiodes difficile infection, intolerance, and cost,” the experts wrote. “It is not necessary to repeat diagnostic tests for SIBO following antibiotic therapy [if] gastrointestinal symptoms respond.”

Dr. Quigley disclosed financial ties to 4D Pharma, Alimentary Health, Allergan, Biocodex, Biomerica, Ironwood, Salix, Takeda, Vibrant, and Zealand. He also disclosed patents with and equity in Alimentary Health. Both of his coauthors also disclosed ties to various pharmaceutical companies.

SOURCE: Quigley EMM et al. Gastroenterology. 2020 Jun 1. doi: 10.1053/j.gastro.2020.06.090.
 

Bariatric surgery resolved nonalcoholic steatohepatitis (NASH) without worsening fibrosis in 84% of patients with evaluable biopsies, according to the findings of a prospective study.

The study included 180 severely or morbidly obese adults (body mass index >35 kg/m²) with NASH who underwent bariatric surgery at a center in France. Among 94 patients evaluated 5 years later, 68% had follow-up liver biopsies, of whom 84% (95% confidence interval, 73.1%-92.2%) met the primary endpoint of resolution of NASH without worsening of fibrosis. All histologic aspects of NASH had improved, median nonalcoholic fatty liver disease scores (NAS) fell from 5 (interquartile range, 4 to 5) to 1 (IQR, 0-2; P < .001), and 90% of patients achieved at least a 2-point NAS improvement. Hepatocellular ballooning also improved in 87.5% of patients. Baseline severity of NASH did not affect the chances of it resolving at 5 years. “The reduction of fibrosis [was] progressive, beginning during the first year and continuing through 5 years,” Guillaume Lassailly, MD, and associates wrote in Gastroenterology.

NASH is a priority for clinical research because of the substantial risk for subsequent cirrhosis, added Dr. Lassailly of CHU Lille (France). For NASH to resolve, most patients need to lose at least 7%-10% of their body weight, but “only 10% of patients reach this objective with lifestyle therapy at 1 year, and less than half maintain the weight loss 5 years later.” Despite ongoing drug development efforts, no medications have been approved for treating NASH. Although weight loss after bariatric surgery has been reported to resolve NASH in approximately 80% of patients at 1 year, longer-term data have been unavailable, and it has remained unclear whether bariatric surgery can slow or halt fibrosis progression.

All patients in this study had biopsy-confirmed NASH and at least a 5-year history of severe or morbid obesity as well as at least one comorbidity, such as diabetes mellitus or arterial hypertension. Patients were not heavy drinkers, and none had detectable markers of chronic liver disease.

Bariatric surgery produced a median 12-kg/m² drop in body mass index. At 5-year follow-up, 93% of patients meeting or exceeding this threshold who had biopsies performed showed resolution of NASH without worsening of fibrosis. Furthermore, 56% of patients (95% CI, 42.4%-69.3%) had no histologic evidence of fibrosis, including 45.5% of patients who had bridging fibrosis at baseline.

Participants in this study received intensive preoperative support, including evaluations by numerous specialists, a nutrition plan, and a 6- to 12-month therapeutic education program. Bariatric surgery techniques included Roux-en-Y gastric bypass, gastric banding, and sleeve gastrectomy. A subgroup analysis linked gastric bypass to a significantly higher probability of meeting the primary endpoint, compared with gastric banding. Refusal was the most common reason for not having a follow-up biopsy, the researchers said. “Patients without liver biopsy after bariatric surgery were not significantly different from those with a histological follow-up except for a lower BMI at 1 year. Baseline fibrosis did not influence the probability of undergoing histological reevaluation at 5 years.”

Two study participants died from surgical complications within 1 month after surgery, and one patient died from cardiac dysfunction 4 years later. No fatality was deemed liver related.

The study was funded by the French Ministry of Health, Conseil Régional Nord-Pas de Calais, National de la Recherche, and the European commission (FEDER). The researchers reported having no conflicts of interest.

SOURCE: Lassailly G et al. Gastroenterology. 2020 Jun 15. doi: 10.1053/j.gastro.2020.06.006.

Bariatric surgery resolved nonalcoholic steatohepatitis (NASH) without worsening fibrosis in 84% of patients with evaluable biopsies, according to the findings of a prospective study.

The study included 180 severely or morbidly obese adults (body mass index >35 kg/m²) with NASH who underwent bariatric surgery at a center in France. Among 94 patients evaluated 5 years later, 68% had follow-up liver biopsies, of whom 84% (95% confidence interval, 73.1%-92.2%) met the primary endpoint of resolution of NASH without worsening of fibrosis. All histologic aspects of NASH had improved, median nonalcoholic fatty liver disease scores (NAS) fell from 5 (interquartile range, 4 to 5) to 1 (IQR, 0-2; P < .001), and 90% of patients achieved at least a 2-point NAS improvement. Hepatocellular ballooning also improved in 87.5% of patients. Baseline severity of NASH did not affect the chances of it resolving at 5 years. “The reduction of fibrosis [was] progressive, beginning during the first year and continuing through 5 years,” Guillaume Lassailly, MD, and associates wrote in Gastroenterology.

NASH is a priority for clinical research because of the substantial risk for subsequent cirrhosis, added Dr. Lassailly of CHU Lille (France). For NASH to resolve, most patients need to lose at least 7%-10% of their body weight, but “only 10% of patients reach this objective with lifestyle therapy at 1 year, and less than half maintain the weight loss 5 years later.” Despite ongoing drug development efforts, no medications have been approved for treating NASH. Although weight loss after bariatric surgery has been reported to resolve NASH in approximately 80% of patients at 1 year, longer-term data have been unavailable, and it has remained unclear whether bariatric surgery can slow or halt fibrosis progression.

All patients in this study had biopsy-confirmed NASH and at least a 5-year history of severe or morbid obesity as well as at least one comorbidity, such as diabetes mellitus or arterial hypertension. Patients were not heavy drinkers, and none had detectable markers of chronic liver disease.

Bariatric surgery produced a median 12-kg/m² drop in body mass index. At 5-year follow-up, 93% of patients meeting or exceeding this threshold who had biopsies performed showed resolution of NASH without worsening of fibrosis. Furthermore, 56% of patients (95% CI, 42.4%-69.3%) had no histologic evidence of fibrosis, including 45.5% of patients who had bridging fibrosis at baseline.

Participants in this study received intensive preoperative support, including evaluations by numerous specialists, a nutrition plan, and a 6- to 12-month therapeutic education program. Bariatric surgery techniques included Roux-en-Y gastric bypass, gastric banding, and sleeve gastrectomy. A subgroup analysis linked gastric bypass to a significantly higher probability of meeting the primary endpoint, compared with gastric banding. Refusal was the most common reason for not having a follow-up biopsy, the researchers said. “Patients without liver biopsy after bariatric surgery were not significantly different from those with a histological follow-up except for a lower BMI at 1 year. Baseline fibrosis did not influence the probability of undergoing histological reevaluation at 5 years.”

Two study participants died from surgical complications within 1 month after surgery, and one patient died from cardiac dysfunction 4 years later. No fatality was deemed liver related.

The study was funded by the French Ministry of Health, Conseil Régional Nord-Pas de Calais, National de la Recherche, and the European commission (FEDER). The researchers reported having no conflicts of interest.

SOURCE: Lassailly G et al. Gastroenterology. 2020 Jun 15. doi: 10.1053/j.gastro.2020.06.006.

Bariatric surgery resolved nonalcoholic steatohepatitis (NASH) without worsening fibrosis in 84% of patients with evaluable biopsies, according to the findings of a prospective study.

The study included 180 severely or morbidly obese adults (body mass index >35 kg/m²) with NASH who underwent bariatric surgery at a center in France. Among 94 patients evaluated 5 years later, 68% had follow-up liver biopsies, of whom 84% (95% confidence interval, 73.1%-92.2%) met the primary endpoint of resolution of NASH without worsening of fibrosis. All histologic aspects of NASH had improved, median nonalcoholic fatty liver disease scores (NAS) fell from 5 (interquartile range, 4 to 5) to 1 (IQR, 0-2; P < .001), and 90% of patients achieved at least a 2-point NAS improvement. Hepatocellular ballooning also improved in 87.5% of patients. Baseline severity of NASH did not affect the chances of it resolving at 5 years. “The reduction of fibrosis [was] progressive, beginning during the first year and continuing through 5 years,” Guillaume Lassailly, MD, and associates wrote in Gastroenterology.

NASH is a priority for clinical research because of the substantial risk for subsequent cirrhosis, added Dr. Lassailly of CHU Lille (France). For NASH to resolve, most patients need to lose at least 7%-10% of their body weight, but “only 10% of patients reach this objective with lifestyle therapy at 1 year, and less than half maintain the weight loss 5 years later.” Despite ongoing drug development efforts, no medications have been approved for treating NASH. Although weight loss after bariatric surgery has been reported to resolve NASH in approximately 80% of patients at 1 year, longer-term data have been unavailable, and it has remained unclear whether bariatric surgery can slow or halt fibrosis progression.

All patients in this study had biopsy-confirmed NASH and at least a 5-year history of severe or morbid obesity as well as at least one comorbidity, such as diabetes mellitus or arterial hypertension. Patients were not heavy drinkers, and none had detectable markers of chronic liver disease.

Bariatric surgery produced a median 12-kg/m² drop in body mass index. At 5-year follow-up, 93% of patients meeting or exceeding this threshold who had biopsies performed showed resolution of NASH without worsening of fibrosis. Furthermore, 56% of patients (95% CI, 42.4%-69.3%) had no histologic evidence of fibrosis, including 45.5% of patients who had bridging fibrosis at baseline.

Participants in this study received intensive preoperative support, including evaluations by numerous specialists, a nutrition plan, and a 6- to 12-month therapeutic education program. Bariatric surgery techniques included Roux-en-Y gastric bypass, gastric banding, and sleeve gastrectomy. A subgroup analysis linked gastric bypass to a significantly higher probability of meeting the primary endpoint, compared with gastric banding. Refusal was the most common reason for not having a follow-up biopsy, the researchers said. “Patients without liver biopsy after bariatric surgery were not significantly different from those with a histological follow-up except for a lower BMI at 1 year. Baseline fibrosis did not influence the probability of undergoing histological reevaluation at 5 years.”

Two study participants died from surgical complications within 1 month after surgery, and one patient died from cardiac dysfunction 4 years later. No fatality was deemed liver related.

The study was funded by the French Ministry of Health, Conseil Régional Nord-Pas de Calais, National de la Recherche, and the European commission (FEDER). The researchers reported having no conflicts of interest.

SOURCE: Lassailly G et al. Gastroenterology. 2020 Jun 15. doi: 10.1053/j.gastro.2020.06.006.

The rising incidence of colorectal cancer in adults younger than 50 years heightens the need to evaluate the colon and rectum of any patient, regardless of age, who presents with symptoms such as rectal bleeding, weight loss, abdominal pain, iron-deficiency anemia, or changes in bowel habits, according to a new American Gastroenterological Association clinical practice update.

In addition to receiving cancer staging or being referred to an oncologist, newly diagnosed patients should be counseled about both germline genetic testing and fertility preservation, wrote Lisa A. Boardman, MD, of Mayo Clinic in Rochester, Minn., with associates in Clinical Gastroenterology and Hepatology. “Clinicians should present the role of fertility preservation prior to [administering] cancer-directed therapy, including surgery, pelvic radiation, or chemotherapy.”

It remains unclear why the incidence of young adult–onset colorectal cancer is rising, but the trend is not limited to the United States. Implicated risk factors include inflammatory bowel disease, prior irradiation, harboring a pathogenic germline mutation for a known hereditary cancer syndrome, and having a first- or second-degree relative with colorectal cancer. Indeed, the odds of developing young adult–onset disease are nearly 4 times higher if a parent has colorectal cancer and nearly 12 times higher if a sibling is affected.

For newly diagnosed young adults, it is important to collect a family cancer history but vital, regardless of history, to discuss targeted or multiplex germline mutation testing. Detecting hereditary colorectal cancer syndromes is crucial because their nature informs surgical options for treatment. “Roughly one in five young adult–onset colorectal cancers will be caused by a germline mutation, and among those with a detectable hereditary condition, half of those patients with young adult–onset colorectal cancer will have Lynch syndrome,” the experts noted. For these patients (who have mutations involving MSH2, EPCAM, MLH1, MSH6, and PMS2), ileorectostomy (IRA) for colorectal cancer should be considered.

For patients with the classic subtype of familial adenomatous polyposis, ileal pouch anal anastomosis is recommended after the polyp burden can no longer be managed endoscopically, although initial IRA with subsequent conversion to IPAA is an option for women of child-bearing age, according to the clinical practice update. Patients with the attenuated subtype of familial adenomatous polyposis should consider IRA or colectomy if colorectal cancer develops or if the polyp burden exceeds endoscopic control. In contrast, colectomy is the only type of surgery recommended for patients with serrated polyposis syndrome requiring surgical treatment.

Finally, clinicians should offer only screening for hereditary cancer syndromes if young adults cancer have been diagnosed with a hereditary colorectal cancer syndrome. “For patients with sporadic young adult–onset colorectal cancer, extracolonic screening and colorectal cancer surveillance intervals are the same as for patients with older adult–onset colorectal cancer,” the experts wrote. For young patients without an apparent underlying genetic syndrome, molecular studies may eventually help tailor treatment options, “but at this point, more extensive surgery or more aggressive chemotherapy cannot be recommended. As cancer treatments evolve to use patient tumor specific therapeutics, our management of patients with young adult–onset colorectal cancer will improve.”

Dr. Boardman and associates reported having no relevant conflicts of interest.

SOURCE: Boardman LA et al. Clin Gastroenterol Hepatol. 2020 Jun 7. doi: 10.1016/j.cgh.2020.05.058.
 

The rising incidence of colorectal cancer in adults younger than 50 years heightens the need to evaluate the colon and rectum of any patient, regardless of age, who presents with symptoms such as rectal bleeding, weight loss, abdominal pain, iron-deficiency anemia, or changes in bowel habits, according to a new American Gastroenterological Association clinical practice update.

In addition to receiving cancer staging or being referred to an oncologist, newly diagnosed patients should be counseled about both germline genetic testing and fertility preservation, wrote Lisa A. Boardman, MD, of Mayo Clinic in Rochester, Minn., with associates in Clinical Gastroenterology and Hepatology. “Clinicians should present the role of fertility preservation prior to [administering] cancer-directed therapy, including surgery, pelvic radiation, or chemotherapy.”

It remains unclear why the incidence of young adult–onset colorectal cancer is rising, but the trend is not limited to the United States. Implicated risk factors include inflammatory bowel disease, prior irradiation, harboring a pathogenic germline mutation for a known hereditary cancer syndrome, and having a first- or second-degree relative with colorectal cancer. Indeed, the odds of developing young adult–onset disease are nearly 4 times higher if a parent has colorectal cancer and nearly 12 times higher if a sibling is affected.

For newly diagnosed young adults, it is important to collect a family cancer history but vital, regardless of history, to discuss targeted or multiplex germline mutation testing. Detecting hereditary colorectal cancer syndromes is crucial because their nature informs surgical options for treatment. “Roughly one in five young adult–onset colorectal cancers will be caused by a germline mutation, and among those with a detectable hereditary condition, half of those patients with young adult–onset colorectal cancer will have Lynch syndrome,” the experts noted. For these patients (who have mutations involving MSH2, EPCAM, MLH1, MSH6, and PMS2), ileorectostomy (IRA) for colorectal cancer should be considered.

For patients with the classic subtype of familial adenomatous polyposis, ileal pouch anal anastomosis is recommended after the polyp burden can no longer be managed endoscopically, although initial IRA with subsequent conversion to IPAA is an option for women of child-bearing age, according to the clinical practice update. Patients with the attenuated subtype of familial adenomatous polyposis should consider IRA or colectomy if colorectal cancer develops or if the polyp burden exceeds endoscopic control. In contrast, colectomy is the only type of surgery recommended for patients with serrated polyposis syndrome requiring surgical treatment.

Finally, clinicians should offer only screening for hereditary cancer syndromes if young adults cancer have been diagnosed with a hereditary colorectal cancer syndrome. “For patients with sporadic young adult–onset colorectal cancer, extracolonic screening and colorectal cancer surveillance intervals are the same as for patients with older adult–onset colorectal cancer,” the experts wrote. For young patients without an apparent underlying genetic syndrome, molecular studies may eventually help tailor treatment options, “but at this point, more extensive surgery or more aggressive chemotherapy cannot be recommended. As cancer treatments evolve to use patient tumor specific therapeutics, our management of patients with young adult–onset colorectal cancer will improve.”

Dr. Boardman and associates reported having no relevant conflicts of interest.

SOURCE: Boardman LA et al. Clin Gastroenterol Hepatol. 2020 Jun 7. doi: 10.1016/j.cgh.2020.05.058.
 

The rising incidence of colorectal cancer in adults younger than 50 years heightens the need to evaluate the colon and rectum of any patient, regardless of age, who presents with symptoms such as rectal bleeding, weight loss, abdominal pain, iron-deficiency anemia, or changes in bowel habits, according to a new American Gastroenterological Association clinical practice update.

In addition to receiving cancer staging or being referred to an oncologist, newly diagnosed patients should be counseled about both germline genetic testing and fertility preservation, wrote Lisa A. Boardman, MD, of Mayo Clinic in Rochester, Minn., with associates in Clinical Gastroenterology and Hepatology. “Clinicians should present the role of fertility preservation prior to [administering] cancer-directed therapy, including surgery, pelvic radiation, or chemotherapy.”

It remains unclear why the incidence of young adult–onset colorectal cancer is rising, but the trend is not limited to the United States. Implicated risk factors include inflammatory bowel disease, prior irradiation, harboring a pathogenic germline mutation for a known hereditary cancer syndrome, and having a first- or second-degree relative with colorectal cancer. Indeed, the odds of developing young adult–onset disease are nearly 4 times higher if a parent has colorectal cancer and nearly 12 times higher if a sibling is affected.

For newly diagnosed young adults, it is important to collect a family cancer history but vital, regardless of history, to discuss targeted or multiplex germline mutation testing. Detecting hereditary colorectal cancer syndromes is crucial because their nature informs surgical options for treatment. “Roughly one in five young adult–onset colorectal cancers will be caused by a germline mutation, and among those with a detectable hereditary condition, half of those patients with young adult–onset colorectal cancer will have Lynch syndrome,” the experts noted. For these patients (who have mutations involving MSH2, EPCAM, MLH1, MSH6, and PMS2), ileorectostomy (IRA) for colorectal cancer should be considered.

For patients with the classic subtype of familial adenomatous polyposis, ileal pouch anal anastomosis is recommended after the polyp burden can no longer be managed endoscopically, although initial IRA with subsequent conversion to IPAA is an option for women of child-bearing age, according to the clinical practice update. Patients with the attenuated subtype of familial adenomatous polyposis should consider IRA or colectomy if colorectal cancer develops or if the polyp burden exceeds endoscopic control. In contrast, colectomy is the only type of surgery recommended for patients with serrated polyposis syndrome requiring surgical treatment.

Finally, clinicians should offer only screening for hereditary cancer syndromes if young adults cancer have been diagnosed with a hereditary colorectal cancer syndrome. “For patients with sporadic young adult–onset colorectal cancer, extracolonic screening and colorectal cancer surveillance intervals are the same as for patients with older adult–onset colorectal cancer,” the experts wrote. For young patients without an apparent underlying genetic syndrome, molecular studies may eventually help tailor treatment options, “but at this point, more extensive surgery or more aggressive chemotherapy cannot be recommended. As cancer treatments evolve to use patient tumor specific therapeutics, our management of patients with young adult–onset colorectal cancer will improve.”

Dr. Boardman and associates reported having no relevant conflicts of interest.

SOURCE: Boardman LA et al. Clin Gastroenterol Hepatol. 2020 Jun 7. doi: 10.1016/j.cgh.2020.05.058.
 

For patients with suspected small-bowel bleeding, a three-variable scoring system predicted the diagnostic outcomes of video capsule endoscopy, according to the findings of a multicenter study.

“Admission to the hospital with overt bleeding and having a hemoglobin [level] of less than 6.4 g/dL were two positive predictors of a diagnosis. Being younger than 54 years old at the time of the video capsule endoscopy exam was a significant negative predictor of a diagnosis,” Neil B. Marya, MD, of the University of California, Los Angeles, and associates wrote in Techniques and Innovations in Gastrointestinal Endoscopy.

To develop the scoring system, they analyzed retrospective data from 162 adults with suspected small-bowel bleeding who received video capsule endoscopies at the University of Massachusetts or the University of California, Los Angeles, in 2016 or 2017. Most of these individuals were outpatients with occult gastrointestinal bleeding, but nearly one-third were inpatients with overt bleeding.

In all, 70 (43%) patients had a relevant finding on video capsule endoscopy, most frequently arteriovenous malformation (26%), blood (10.5%), or ulceration (10.5%). On multivariable analysis, the odds of positive video capsule endoscopy were significantly higher when patients had been admitted to the hospital with overt bleeding (adjusted odds ratio, 2.38; 95% confidence interval, 1.05-5.39) or had a baseline hemoglobin level less than or equal to 6.4 g/dL (aOR, 2.68; 95% CI, 1.11-6.48). In contrast, patients who were younger than 54 years were significantly less likely to have diagnostic lesions (aOR, 0.25; 95% CI, 0.11-0.58). After designating these variables as A, B, and C, respectively, the researchers derived the following equation to produce the score: (0.87 x A) + (0.99 x B) – (1.38 x C). Each variable was scored as 1 (present) or 0 (absent). Based on this equation, the highest score possible score was 1.86, and the lowest possible score was –1.38.

The researchers validated this scoring system by analyzing data from 152 adults with suspected small-bowel bleeding who were examined prospectively at the two centers. The development and validation cohorts resembled each other except that the validation cohort had lower mean hemoglobin levels (8.2 g/dL versus 9.0 g/dL in the development cohort; P < .01) and higher mean blood urea nitrogen levels (25.3 mg/dL vs. 19.9 mg per dL; P =.03). Receiver operating curves were similar between the two groups (respective C-statistics, 0.70 and 0.69; P = .91).

However, the scoring system’s maximum specificity was only 30.6%, yielding a positive predictive value of only 48.6%. The associated cutoff score was greater than or equal to 0. At this cutoff, sensitivity was “at least 90%,” and negative predictive value was 83.6%. Thus, the scoring system is best suited for identifying patients who are unlikely to have a diagnostic lesion found on video capsule endoscopy, the researchers said.

“Patients with scores of less than 0 could conceivably have capsule examinations deferred,” they concluded. “For example, consider a clinician taking care of a hospitalized patient who meets criteria for undergoing video capsule endoscopy for the indication of suspected small intestinal bleeding, but finds that the patient has a suspected small-bowel bleeding capsule diagnosis score of less than 0. The clinician could decide to have their patient undergo the video capsule endoscopy as an outpatient, since the likelihood of detecting an actionable lesion is low. This decision could have a [beneficial] financial impact.”

No external funding sources were reported. Dr. Marya disclosed a recent consulting relationship with AnX Robotica. Two coinvestigators disclosed a consulting relationship with Medtronic and research support from Olympus and Medtronic.

SOURCE: Marya NB et al. Tech Innov Gastrointest Endosc. 2020 Jun 19. doi: 10.1016/j.tige.2020.06.001.

For patients with suspected small-bowel bleeding, a three-variable scoring system predicted the diagnostic outcomes of video capsule endoscopy, according to the findings of a multicenter study.

“Admission to the hospital with overt bleeding and having a hemoglobin [level] of less than 6.4 g/dL were two positive predictors of a diagnosis. Being younger than 54 years old at the time of the video capsule endoscopy exam was a significant negative predictor of a diagnosis,” Neil B. Marya, MD, of the University of California, Los Angeles, and associates wrote in Techniques and Innovations in Gastrointestinal Endoscopy.

To develop the scoring system, they analyzed retrospective data from 162 adults with suspected small-bowel bleeding who received video capsule endoscopies at the University of Massachusetts or the University of California, Los Angeles, in 2016 or 2017. Most of these individuals were outpatients with occult gastrointestinal bleeding, but nearly one-third were inpatients with overt bleeding.

In all, 70 (43%) patients had a relevant finding on video capsule endoscopy, most frequently arteriovenous malformation (26%), blood (10.5%), or ulceration (10.5%). On multivariable analysis, the odds of positive video capsule endoscopy were significantly higher when patients had been admitted to the hospital with overt bleeding (adjusted odds ratio, 2.38; 95% confidence interval, 1.05-5.39) or had a baseline hemoglobin level less than or equal to 6.4 g/dL (aOR, 2.68; 95% CI, 1.11-6.48). In contrast, patients who were younger than 54 years were significantly less likely to have diagnostic lesions (aOR, 0.25; 95% CI, 0.11-0.58). After designating these variables as A, B, and C, respectively, the researchers derived the following equation to produce the score: (0.87 x A) + (0.99 x B) – (1.38 x C). Each variable was scored as 1 (present) or 0 (absent). Based on this equation, the highest score possible score was 1.86, and the lowest possible score was –1.38.

The researchers validated this scoring system by analyzing data from 152 adults with suspected small-bowel bleeding who were examined prospectively at the two centers. The development and validation cohorts resembled each other except that the validation cohort had lower mean hemoglobin levels (8.2 g/dL versus 9.0 g/dL in the development cohort; P < .01) and higher mean blood urea nitrogen levels (25.3 mg/dL vs. 19.9 mg per dL; P =.03). Receiver operating curves were similar between the two groups (respective C-statistics, 0.70 and 0.69; P = .91).

However, the scoring system’s maximum specificity was only 30.6%, yielding a positive predictive value of only 48.6%. The associated cutoff score was greater than or equal to 0. At this cutoff, sensitivity was “at least 90%,” and negative predictive value was 83.6%. Thus, the scoring system is best suited for identifying patients who are unlikely to have a diagnostic lesion found on video capsule endoscopy, the researchers said.

“Patients with scores of less than 0 could conceivably have capsule examinations deferred,” they concluded. “For example, consider a clinician taking care of a hospitalized patient who meets criteria for undergoing video capsule endoscopy for the indication of suspected small intestinal bleeding, but finds that the patient has a suspected small-bowel bleeding capsule diagnosis score of less than 0. The clinician could decide to have their patient undergo the video capsule endoscopy as an outpatient, since the likelihood of detecting an actionable lesion is low. This decision could have a [beneficial] financial impact.”

No external funding sources were reported. Dr. Marya disclosed a recent consulting relationship with AnX Robotica. Two coinvestigators disclosed a consulting relationship with Medtronic and research support from Olympus and Medtronic.

SOURCE: Marya NB et al. Tech Innov Gastrointest Endosc. 2020 Jun 19. doi: 10.1016/j.tige.2020.06.001.

For patients with suspected small-bowel bleeding, a three-variable scoring system predicted the diagnostic outcomes of video capsule endoscopy, according to the findings of a multicenter study.

“Admission to the hospital with overt bleeding and having a hemoglobin [level] of less than 6.4 g/dL were two positive predictors of a diagnosis. Being younger than 54 years old at the time of the video capsule endoscopy exam was a significant negative predictor of a diagnosis,” Neil B. Marya, MD, of the University of California, Los Angeles, and associates wrote in Techniques and Innovations in Gastrointestinal Endoscopy.

To develop the scoring system, they analyzed retrospective data from 162 adults with suspected small-bowel bleeding who received video capsule endoscopies at the University of Massachusetts or the University of California, Los Angeles, in 2016 or 2017. Most of these individuals were outpatients with occult gastrointestinal bleeding, but nearly one-third were inpatients with overt bleeding.

In all, 70 (43%) patients had a relevant finding on video capsule endoscopy, most frequently arteriovenous malformation (26%), blood (10.5%), or ulceration (10.5%). On multivariable analysis, the odds of positive video capsule endoscopy were significantly higher when patients had been admitted to the hospital with overt bleeding (adjusted odds ratio, 2.38; 95% confidence interval, 1.05-5.39) or had a baseline hemoglobin level less than or equal to 6.4 g/dL (aOR, 2.68; 95% CI, 1.11-6.48). In contrast, patients who were younger than 54 years were significantly less likely to have diagnostic lesions (aOR, 0.25; 95% CI, 0.11-0.58). After designating these variables as A, B, and C, respectively, the researchers derived the following equation to produce the score: (0.87 x A) + (0.99 x B) – (1.38 x C). Each variable was scored as 1 (present) or 0 (absent). Based on this equation, the highest score possible score was 1.86, and the lowest possible score was –1.38.

The researchers validated this scoring system by analyzing data from 152 adults with suspected small-bowel bleeding who were examined prospectively at the two centers. The development and validation cohorts resembled each other except that the validation cohort had lower mean hemoglobin levels (8.2 g/dL versus 9.0 g/dL in the development cohort; P < .01) and higher mean blood urea nitrogen levels (25.3 mg/dL vs. 19.9 mg per dL; P =.03). Receiver operating curves were similar between the two groups (respective C-statistics, 0.70 and 0.69; P = .91).

However, the scoring system’s maximum specificity was only 30.6%, yielding a positive predictive value of only 48.6%. The associated cutoff score was greater than or equal to 0. At this cutoff, sensitivity was “at least 90%,” and negative predictive value was 83.6%. Thus, the scoring system is best suited for identifying patients who are unlikely to have a diagnostic lesion found on video capsule endoscopy, the researchers said.

“Patients with scores of less than 0 could conceivably have capsule examinations deferred,” they concluded. “For example, consider a clinician taking care of a hospitalized patient who meets criteria for undergoing video capsule endoscopy for the indication of suspected small intestinal bleeding, but finds that the patient has a suspected small-bowel bleeding capsule diagnosis score of less than 0. The clinician could decide to have their patient undergo the video capsule endoscopy as an outpatient, since the likelihood of detecting an actionable lesion is low. This decision could have a [beneficial] financial impact.”

No external funding sources were reported. Dr. Marya disclosed a recent consulting relationship with AnX Robotica. Two coinvestigators disclosed a consulting relationship with Medtronic and research support from Olympus and Medtronic.

SOURCE: Marya NB et al. Tech Innov Gastrointest Endosc. 2020 Jun 19. doi: 10.1016/j.tige.2020.06.001.

Changes in a variety of T cells in the liver and visceral adipose tissue play a key role in the pathogenesis of nonalcoholic steatohepatitis, according to the results of a murine study.

Mikhaïl A. Van Herck, of the University of Antwerp (Belgium), and associates fed 8-week old mice a high-fat, high-fructose diet for 20 weeks, and then switched the mice to standard mouse chow for 12 weeks. The high-fat, high-fructose diet induced the metabolic syndrome and nonalcoholic steatohepatitis (NASH), accompanied by shifts in T cells. Interleukin-17–producing (Th17 cells increased in the liver, visceral adipose tissue, and blood, while regulatory T cells decreased in visceral adipose tissue, and cytotoxic T (Tc) cells rose in visceral adipose tissue while dropping in the blood and spleen.

These are “important immune disruptions,” the researchers wrote in Cellular and Molecular Gastroenterology and Hepatology. “In particular, visceral adipose tissue Tc cells are critically involved in NASH pathogenesis, linking adipose tissue inflammation to liver disease.”

After the mice were switched from the high-fat, high-fructose diet to standard mouse chow, their body weight, body fat, and plasma cholesterol significantly decreased and their glucose tolerance and insulin sensitivity improved to resemble the metrics of mice fed standard mouse chow throughout the study. Mice who underwent diet reversal also had significantly decreased liver weight and levels of plasma ALT, compared with mice that remained on the high-fat, high-fructose diet. Diet reversal also improved liver histology (nonalcoholic fatty liver disease activity scores), compared with the high-fat, high-fructose diet, the researchers wrote. “Importantly, the NASH was not significantly different between diet-reversal mice and mice fed the control diet for 32 weeks.”

Genetic tests supported these findings. On multiplex RNA analysis, hepatic expression of Acta2, Col1a1, and Col1a3 reverted to normal with diet reversal, indicating a normalization of hepatic collagen. Hepatic expression of the metabolic genes Ppara, Pparg, and Fgf21 also returned to normal, while visceral adipose tissue showed a decrease in Lep and Fgf21 expression and resolution of adipocyte hypertrophy.

However, diet reversal did not reverse inflammatory changes in T-cell subsets. Administering anti-CD8a antibodies after diet reversal decreased Tc cells in all tissue types that were tested, signifying “a biochemical and histologic attenuation of the high-fat, high-fructose diet-induced NASH,” the investigators wrote. Treating the mice with antibodies targeting IL-17A did not attenuate NASH but did reduce hepatic inflammation.

The fact that “the most pronounced effect” on NASH resulted from correcting immune disruption in visceral adipose tissue underscored “the immense importance of adipose tissue inflammation in [NASH] pathogenesis,” the researchers wrote. The finding that diet reversal alone did not reverse inflammation in hepatic or visceral adipose tissue “challeng[es] our current understanding of the reversibility of NASH and other obesity-related conditions.” They called for studies of underlying mechanisms as part of “the search for a medical treatment for NASH.”

Funders included the University Research Fund, University of Antwerp, and Research Foundation Flanders. The researchers reported having no conflicts of interest except that one coinvestigator is the chief science officer at Biocellvia, which performed some histologic analyses.

SOURCE: Van Herck MA et al. Cell Molec Gastroenterol Hepatol. 2020 Apr 20. doi: 10.1016/j.jcmgh.2020.04.010.

Changes in a variety of T cells in the liver and visceral adipose tissue play a key role in the pathogenesis of nonalcoholic steatohepatitis, according to the results of a murine study.

Mikhaïl A. Van Herck, of the University of Antwerp (Belgium), and associates fed 8-week old mice a high-fat, high-fructose diet for 20 weeks, and then switched the mice to standard mouse chow for 12 weeks. The high-fat, high-fructose diet induced the metabolic syndrome and nonalcoholic steatohepatitis (NASH), accompanied by shifts in T cells. Interleukin-17–producing (Th17 cells increased in the liver, visceral adipose tissue, and blood, while regulatory T cells decreased in visceral adipose tissue, and cytotoxic T (Tc) cells rose in visceral adipose tissue while dropping in the blood and spleen.

These are “important immune disruptions,” the researchers wrote in Cellular and Molecular Gastroenterology and Hepatology. “In particular, visceral adipose tissue Tc cells are critically involved in NASH pathogenesis, linking adipose tissue inflammation to liver disease.”

After the mice were switched from the high-fat, high-fructose diet to standard mouse chow, their body weight, body fat, and plasma cholesterol significantly decreased and their glucose tolerance and insulin sensitivity improved to resemble the metrics of mice fed standard mouse chow throughout the study. Mice who underwent diet reversal also had significantly decreased liver weight and levels of plasma ALT, compared with mice that remained on the high-fat, high-fructose diet. Diet reversal also improved liver histology (nonalcoholic fatty liver disease activity scores), compared with the high-fat, high-fructose diet, the researchers wrote. “Importantly, the NASH was not significantly different between diet-reversal mice and mice fed the control diet for 32 weeks.”

Genetic tests supported these findings. On multiplex RNA analysis, hepatic expression of Acta2, Col1a1, and Col1a3 reverted to normal with diet reversal, indicating a normalization of hepatic collagen. Hepatic expression of the metabolic genes Ppara, Pparg, and Fgf21 also returned to normal, while visceral adipose tissue showed a decrease in Lep and Fgf21 expression and resolution of adipocyte hypertrophy.

However, diet reversal did not reverse inflammatory changes in T-cell subsets. Administering anti-CD8a antibodies after diet reversal decreased Tc cells in all tissue types that were tested, signifying “a biochemical and histologic attenuation of the high-fat, high-fructose diet-induced NASH,” the investigators wrote. Treating the mice with antibodies targeting IL-17A did not attenuate NASH but did reduce hepatic inflammation.

The fact that “the most pronounced effect” on NASH resulted from correcting immune disruption in visceral adipose tissue underscored “the immense importance of adipose tissue inflammation in [NASH] pathogenesis,” the researchers wrote. The finding that diet reversal alone did not reverse inflammation in hepatic or visceral adipose tissue “challeng[es] our current understanding of the reversibility of NASH and other obesity-related conditions.” They called for studies of underlying mechanisms as part of “the search for a medical treatment for NASH.”

Funders included the University Research Fund, University of Antwerp, and Research Foundation Flanders. The researchers reported having no conflicts of interest except that one coinvestigator is the chief science officer at Biocellvia, which performed some histologic analyses.

SOURCE: Van Herck MA et al. Cell Molec Gastroenterol Hepatol. 2020 Apr 20. doi: 10.1016/j.jcmgh.2020.04.010.

Changes in a variety of T cells in the liver and visceral adipose tissue play a key role in the pathogenesis of nonalcoholic steatohepatitis, according to the results of a murine study.

Mikhaïl A. Van Herck, of the University of Antwerp (Belgium), and associates fed 8-week old mice a high-fat, high-fructose diet for 20 weeks, and then switched the mice to standard mouse chow for 12 weeks. The high-fat, high-fructose diet induced the metabolic syndrome and nonalcoholic steatohepatitis (NASH), accompanied by shifts in T cells. Interleukin-17–producing (Th17 cells increased in the liver, visceral adipose tissue, and blood, while regulatory T cells decreased in visceral adipose tissue, and cytotoxic T (Tc) cells rose in visceral adipose tissue while dropping in the blood and spleen.

These are “important immune disruptions,” the researchers wrote in Cellular and Molecular Gastroenterology and Hepatology. “In particular, visceral adipose tissue Tc cells are critically involved in NASH pathogenesis, linking adipose tissue inflammation to liver disease.”

After the mice were switched from the high-fat, high-fructose diet to standard mouse chow, their body weight, body fat, and plasma cholesterol significantly decreased and their glucose tolerance and insulin sensitivity improved to resemble the metrics of mice fed standard mouse chow throughout the study. Mice who underwent diet reversal also had significantly decreased liver weight and levels of plasma ALT, compared with mice that remained on the high-fat, high-fructose diet. Diet reversal also improved liver histology (nonalcoholic fatty liver disease activity scores), compared with the high-fat, high-fructose diet, the researchers wrote. “Importantly, the NASH was not significantly different between diet-reversal mice and mice fed the control diet for 32 weeks.”

Genetic tests supported these findings. On multiplex RNA analysis, hepatic expression of Acta2, Col1a1, and Col1a3 reverted to normal with diet reversal, indicating a normalization of hepatic collagen. Hepatic expression of the metabolic genes Ppara, Pparg, and Fgf21 also returned to normal, while visceral adipose tissue showed a decrease in Lep and Fgf21 expression and resolution of adipocyte hypertrophy.

However, diet reversal did not reverse inflammatory changes in T-cell subsets. Administering anti-CD8a antibodies after diet reversal decreased Tc cells in all tissue types that were tested, signifying “a biochemical and histologic attenuation of the high-fat, high-fructose diet-induced NASH,” the investigators wrote. Treating the mice with antibodies targeting IL-17A did not attenuate NASH but did reduce hepatic inflammation.

The fact that “the most pronounced effect” on NASH resulted from correcting immune disruption in visceral adipose tissue underscored “the immense importance of adipose tissue inflammation in [NASH] pathogenesis,” the researchers wrote. The finding that diet reversal alone did not reverse inflammation in hepatic or visceral adipose tissue “challeng[es] our current understanding of the reversibility of NASH and other obesity-related conditions.” They called for studies of underlying mechanisms as part of “the search for a medical treatment for NASH.”

Funders included the University Research Fund, University of Antwerp, and Research Foundation Flanders. The researchers reported having no conflicts of interest except that one coinvestigator is the chief science officer at Biocellvia, which performed some histologic analyses.

SOURCE: Van Herck MA et al. Cell Molec Gastroenterol Hepatol. 2020 Apr 20. doi: 10.1016/j.jcmgh.2020.04.010.