Myelodysplastic Syndrome

Key clinical point: Approximately half of transfusion-dependent MDS patients said they had not discussed ways to reduce the need for transfusions with their doctors and 74% said there were no alternatives to blood transfusions.

Major finding: Among adults with MDS, those with disease duration less than 5 years cited transfusion reactions as their greatest concern; those with longer disease duration cited iron overload. However, a majority of 71% of the patients ranked their quality of life as good or excellent. MDS physicians reported that they would be most likely to offer blood transfusions as primary therapy to patients who were older than 80 years, frail, had lower risk MDS, or had other significant comorbidities.

Study details: The data come from a pair of cross-sectional surveys including 157 myelodysplastic syndrome (MDS) patients and 109 MDS physicians.

Disclosures: The study was supported by the Aplastic Anemia and MDS International Foundation through a grant from Celgene. Lead author Dr. King was supported in part by The Maren Research Award Scholarship through the University of Florida.

Citation: King D et al. Leuk Res. 2020 July 15. doi: 10.1016/j.leukres.2020.106425.

Key clinical point: Approximately half of transfusion-dependent MDS patients said they had not discussed ways to reduce the need for transfusions with their doctors and 74% said there were no alternatives to blood transfusions.

Major finding: Among adults with MDS, those with disease duration less than 5 years cited transfusion reactions as their greatest concern; those with longer disease duration cited iron overload. However, a majority of 71% of the patients ranked their quality of life as good or excellent. MDS physicians reported that they would be most likely to offer blood transfusions as primary therapy to patients who were older than 80 years, frail, had lower risk MDS, or had other significant comorbidities.

Study details: The data come from a pair of cross-sectional surveys including 157 myelodysplastic syndrome (MDS) patients and 109 MDS physicians.

Disclosures: The study was supported by the Aplastic Anemia and MDS International Foundation through a grant from Celgene. Lead author Dr. King was supported in part by The Maren Research Award Scholarship through the University of Florida.

Citation: King D et al. Leuk Res. 2020 July 15. doi: 10.1016/j.leukres.2020.106425.

Key clinical point: Approximately half of transfusion-dependent MDS patients said they had not discussed ways to reduce the need for transfusions with their doctors and 74% said there were no alternatives to blood transfusions.

Major finding: Among adults with MDS, those with disease duration less than 5 years cited transfusion reactions as their greatest concern; those with longer disease duration cited iron overload. However, a majority of 71% of the patients ranked their quality of life as good or excellent. MDS physicians reported that they would be most likely to offer blood transfusions as primary therapy to patients who were older than 80 years, frail, had lower risk MDS, or had other significant comorbidities.

Study details: The data come from a pair of cross-sectional surveys including 157 myelodysplastic syndrome (MDS) patients and 109 MDS physicians.

Disclosures: The study was supported by the Aplastic Anemia and MDS International Foundation through a grant from Celgene. Lead author Dr. King was supported in part by The Maren Research Award Scholarship through the University of Florida.

Citation: King D et al. Leuk Res. 2020 July 15. doi: 10.1016/j.leukres.2020.106425.

Key clinical point: Bronchoscopy was safe for most patients with malignant hematologic disorders with careful monitoring and use of sedatives, particularly midazolam.

Major finding: A total of 12 out of 272 patients (3.8%) experienced prolonged oxygen desaturation; 7 of these recovered and 5 died from lung lesion deterioration. However, midazolam reduced the risk of prolonged oxygen desaturation in the study population.

Study details: The data come from a review of 316 bronchoscopies in 282 adults with malignant hematologic disorders and pulmonary infiltrates who were treated at a single center.

Disclosures: Lead author Dr. Uruga disclosed grant support from Okinaka Memorial Institute for Medical Research.

Citation: Uruga H et al. BMC Pulm Med. 2020 Sep 11. doi: 10.1186/s12890-020-01283-8.

Key clinical point: Bronchoscopy was safe for most patients with malignant hematologic disorders with careful monitoring and use of sedatives, particularly midazolam.

Major finding: A total of 12 out of 272 patients (3.8%) experienced prolonged oxygen desaturation; 7 of these recovered and 5 died from lung lesion deterioration. However, midazolam reduced the risk of prolonged oxygen desaturation in the study population.

Study details: The data come from a review of 316 bronchoscopies in 282 adults with malignant hematologic disorders and pulmonary infiltrates who were treated at a single center.

Disclosures: Lead author Dr. Uruga disclosed grant support from Okinaka Memorial Institute for Medical Research.

Citation: Uruga H et al. BMC Pulm Med. 2020 Sep 11. doi: 10.1186/s12890-020-01283-8.

Key clinical point: Bronchoscopy was safe for most patients with malignant hematologic disorders with careful monitoring and use of sedatives, particularly midazolam.

Major finding: A total of 12 out of 272 patients (3.8%) experienced prolonged oxygen desaturation; 7 of these recovered and 5 died from lung lesion deterioration. However, midazolam reduced the risk of prolonged oxygen desaturation in the study population.

Study details: The data come from a review of 316 bronchoscopies in 282 adults with malignant hematologic disorders and pulmonary infiltrates who were treated at a single center.

Disclosures: Lead author Dr. Uruga disclosed grant support from Okinaka Memorial Institute for Medical Research.

Citation: Uruga H et al. BMC Pulm Med. 2020 Sep 11. doi: 10.1186/s12890-020-01283-8.

Key clinical point: Adults with end-stage renal disease who underwent dialysis for at least six months were at significantly increased risk for MDS compared with healthy controls.

Major finding: Patients with chronic renal failure who underwent dialysis were significantly more likely to develop myelodysplastic syndrome compared to healthy controls (subdistribution hazard ratio 1.60); older age also was significantly associated with increased MDS risk (sHR 1.03).

Study details: The data come from a study of 74,712 adults with chronic renal failure diagnoses between 1997 and 2013 who underwent dialysis, and matched controls. Participants were follow from index date to the first occurrence of MDS, withdrawal from the NHI program, or the last day of 2013.

Disclosures: The study used the National Health Insurance Research Database established by the National Health Research Institutes with the authorization of the Bureau of National Health Insurance, Ministry of Health and Welfare of Taiwan. The researchers had no financial conflicts to disclose.

Citation: Chang M-Y et al. Sci Rep. 2020 Sept 23. doi: 10.1038/s41598-020-72568-5.

Key clinical point: Adults with end-stage renal disease who underwent dialysis for at least six months were at significantly increased risk for MDS compared with healthy controls.

Major finding: Patients with chronic renal failure who underwent dialysis were significantly more likely to develop myelodysplastic syndrome compared to healthy controls (subdistribution hazard ratio 1.60); older age also was significantly associated with increased MDS risk (sHR 1.03).

Study details: The data come from a study of 74,712 adults with chronic renal failure diagnoses between 1997 and 2013 who underwent dialysis, and matched controls. Participants were follow from index date to the first occurrence of MDS, withdrawal from the NHI program, or the last day of 2013.

Disclosures: The study used the National Health Insurance Research Database established by the National Health Research Institutes with the authorization of the Bureau of National Health Insurance, Ministry of Health and Welfare of Taiwan. The researchers had no financial conflicts to disclose.

Citation: Chang M-Y et al. Sci Rep. 2020 Sept 23. doi: 10.1038/s41598-020-72568-5.

Key clinical point: Adults with end-stage renal disease who underwent dialysis for at least six months were at significantly increased risk for MDS compared with healthy controls.

Major finding: Patients with chronic renal failure who underwent dialysis were significantly more likely to develop myelodysplastic syndrome compared to healthy controls (subdistribution hazard ratio 1.60); older age also was significantly associated with increased MDS risk (sHR 1.03).

Study details: The data come from a study of 74,712 adults with chronic renal failure diagnoses between 1997 and 2013 who underwent dialysis, and matched controls. Participants were follow from index date to the first occurrence of MDS, withdrawal from the NHI program, or the last day of 2013.

Disclosures: The study used the National Health Insurance Research Database established by the National Health Research Institutes with the authorization of the Bureau of National Health Insurance, Ministry of Health and Welfare of Taiwan. The researchers had no financial conflicts to disclose.

Citation: Chang M-Y et al. Sci Rep. 2020 Sept 23. doi: 10.1038/s41598-020-72568-5.

Key clinical point: Several long noncoding RNAs (lncRNAs) were strongly associated with disease pathogenesis and prognosis in myelodysplastic syndrome (MDS) patients.

Major finding: Based on genome-wide profiling, lncRNA gene networks with expression of H19, WT1-AS, TCL6, and LEF1-AS1 were associated with higher-risk MDS; of these, H19 also showed promise as a therapeutic target because of its strong predictive value for lower complete remission rate of induction therapy in AML in the presence of H19 overexpression. 

Study details: The data come from a study of genetic profiling including 54 patients with MDS, 14 patients with acute myeloid leukemia with myelodysplasia-related changes (AML-MRC), and 9 healthy donors.

Disclosures: The study was supported by the Project for Conceptual Development of Research Organization from the Ministry of Health of the Czech Republic. The researchers had no financial conflicts to disclose.

Citation: Szikszai K et al. Cancers. 2020 Sept 23. doi: 10.3390/cancers12102726.

Key clinical point: Several long noncoding RNAs (lncRNAs) were strongly associated with disease pathogenesis and prognosis in myelodysplastic syndrome (MDS) patients.

Major finding: Based on genome-wide profiling, lncRNA gene networks with expression of H19, WT1-AS, TCL6, and LEF1-AS1 were associated with higher-risk MDS; of these, H19 also showed promise as a therapeutic target because of its strong predictive value for lower complete remission rate of induction therapy in AML in the presence of H19 overexpression. 

Study details: The data come from a study of genetic profiling including 54 patients with MDS, 14 patients with acute myeloid leukemia with myelodysplasia-related changes (AML-MRC), and 9 healthy donors.

Disclosures: The study was supported by the Project for Conceptual Development of Research Organization from the Ministry of Health of the Czech Republic. The researchers had no financial conflicts to disclose.

Citation: Szikszai K et al. Cancers. 2020 Sept 23. doi: 10.3390/cancers12102726.

Key clinical point: Several long noncoding RNAs (lncRNAs) were strongly associated with disease pathogenesis and prognosis in myelodysplastic syndrome (MDS) patients.

Major finding: Based on genome-wide profiling, lncRNA gene networks with expression of H19, WT1-AS, TCL6, and LEF1-AS1 were associated with higher-risk MDS; of these, H19 also showed promise as a therapeutic target because of its strong predictive value for lower complete remission rate of induction therapy in AML in the presence of H19 overexpression. 

Study details: The data come from a study of genetic profiling including 54 patients with MDS, 14 patients with acute myeloid leukemia with myelodysplasia-related changes (AML-MRC), and 9 healthy donors.

Disclosures: The study was supported by the Project for Conceptual Development of Research Organization from the Ministry of Health of the Czech Republic. The researchers had no financial conflicts to disclose.

Citation: Szikszai K et al. Cancers. 2020 Sept 23. doi: 10.3390/cancers12102726.

Key clinical point: Ferroptosis, a distinct form of regulated cell death process involving iron-dependent lipid peroxidation, may impact the action of chemotherapy drug decitabine.

Major finding: The level of GSH and the activity of GPX4 decreased, whereas the ROS level increased in MDS cells upon treatment with decitabine, which could be reversed by ferrostatin-1.

Study details: The data come from a review of cell viability assays, reactive oxygen species assays, gluthiathone assays, and

Disclosures: The study was supported in part by the National Natural Science Foundation of China, Key Technology Research and Development Program of Tianjin, Application Bases and Advanced Technology Research Program of Tianjin, and Key National Natural Science Foundation of Tianjin. The researchers had no financial conflicts to disclose.

Citation: Lv Q et al. Front. Oncol. 2020 Sept 2. doi: 10.3389/fonc.2020.01656.

Key clinical point: Ferroptosis, a distinct form of regulated cell death process involving iron-dependent lipid peroxidation, may impact the action of chemotherapy drug decitabine.

Major finding: The level of GSH and the activity of GPX4 decreased, whereas the ROS level increased in MDS cells upon treatment with decitabine, which could be reversed by ferrostatin-1.

Study details: The data come from a review of cell viability assays, reactive oxygen species assays, gluthiathone assays, and

Disclosures: The study was supported in part by the National Natural Science Foundation of China, Key Technology Research and Development Program of Tianjin, Application Bases and Advanced Technology Research Program of Tianjin, and Key National Natural Science Foundation of Tianjin. The researchers had no financial conflicts to disclose.

Citation: Lv Q et al. Front. Oncol. 2020 Sept 2. doi: 10.3389/fonc.2020.01656.

Key clinical point: Ferroptosis, a distinct form of regulated cell death process involving iron-dependent lipid peroxidation, may impact the action of chemotherapy drug decitabine.

Major finding: The level of GSH and the activity of GPX4 decreased, whereas the ROS level increased in MDS cells upon treatment with decitabine, which could be reversed by ferrostatin-1.

Study details: The data come from a review of cell viability assays, reactive oxygen species assays, gluthiathone assays, and

Disclosures: The study was supported in part by the National Natural Science Foundation of China, Key Technology Research and Development Program of Tianjin, Application Bases and Advanced Technology Research Program of Tianjin, and Key National Natural Science Foundation of Tianjin. The researchers had no financial conflicts to disclose.

Citation: Lv Q et al. Front. Oncol. 2020 Sept 2. doi: 10.3389/fonc.2020.01656.

Key clinical point: In a population of MDS patients with COVID-19 symptoms who underwent laboratory testing, 20.6% had confirmed cases.

Major finding: At the time of this analysis, 33 of 63 COVID-19 positive MDS patients were alive, suggesting a higher lethality rate in this population compared to the population at large.

Study details: The data come from a review of 5,326 adults with myelodysplastic syndromes who were symptomatic for COVID-19 between February 24 and April 28, 2020; 305 MDS patients underwent laboratory testing to confirm the infection.

Disclosures: The study was received no outside funding. The researchers had no financial conflicts to disclose.

Citation: Mossuto S et al. HemaSphere. 2020 Oct. doi: 10.1097/HS9.0000000000000483.

Key clinical point: In a population of MDS patients with COVID-19 symptoms who underwent laboratory testing, 20.6% had confirmed cases.

Major finding: At the time of this analysis, 33 of 63 COVID-19 positive MDS patients were alive, suggesting a higher lethality rate in this population compared to the population at large.

Study details: The data come from a review of 5,326 adults with myelodysplastic syndromes who were symptomatic for COVID-19 between February 24 and April 28, 2020; 305 MDS patients underwent laboratory testing to confirm the infection.

Disclosures: The study was received no outside funding. The researchers had no financial conflicts to disclose.

Citation: Mossuto S et al. HemaSphere. 2020 Oct. doi: 10.1097/HS9.0000000000000483.

Key clinical point: In a population of MDS patients with COVID-19 symptoms who underwent laboratory testing, 20.6% had confirmed cases.

Major finding: At the time of this analysis, 33 of 63 COVID-19 positive MDS patients were alive, suggesting a higher lethality rate in this population compared to the population at large.

Study details: The data come from a review of 5,326 adults with myelodysplastic syndromes who were symptomatic for COVID-19 between February 24 and April 28, 2020; 305 MDS patients underwent laboratory testing to confirm the infection.

Disclosures: The study was received no outside funding. The researchers had no financial conflicts to disclose.

Citation: Mossuto S et al. HemaSphere. 2020 Oct. doi: 10.1097/HS9.0000000000000483.

Prognoses remain extremely poor after hypomethylating agents (HMAs) fail in patients with higher-risk myelodysplastic syndromes (HR-MDS). But a hematologist-oncologist told colleagues that novel therapies are in the works, and some show promise.

Still, “the clinical development for drugs in this setting has been quite challenging, and we have had a lot of drugs that have died in this space over the years,” cautioned Amer Zeidan, MBBS, MHS, an associate professor at Yale University, New Haven, Conn., in a presentation at the virtual Acute Leukemia Forum of Hemedicus. For now, “the best way to manage HMA failure in MDS patients is by preventing HMA failure.”

Dr. Zeidan highlighted a 2016 study – which he led – that found the median overall survival from diagnosis was just a median of 17.0 months (95% confidence interval, 15.8-18.4) in 632 patients with HR-MDS. Another 2016 study, which he also led, reported median overall survival of 11 months (95% CI, 10-14) and 12 months (95% CI, 11-16; P = .26) for patients aged 66 or older who had HR-MDS and took azacitidine and decitabine, respectively. Median survival is even shorter after HMA failure, he said.

The most important obstacle to effective therapy is “the biologic and molecular heterogeneity of the disease,” he said. “Only a certain number of genes are altered in a significant number of patients. And then you have a very long tail, with so many alterations, but most of them are rare. That makes targeting all patients with the same mechanism quite challenging. Also, we poorly understand how hypomethylating agents work and the mechanism of primary and secondary failure. And many MDS patients are older with multiple conditions, multiple comorbidities. By the time of failure, they are generally beaten up and very difficult to enroll in clinical trials.”

Even so, he said, “the understanding of the molecular pathogenesis of MDS is starting to open the door for new drug development opportunities. What’s been changing over the last 5 years is an increased understanding of targeting some of the alterations that are specific to the patient – individualized targeting or precision medicine.”
 

Novel therapies

Dr. Zeidan said the novel therapies for HR-MDS after HMA failure fall into these categories: molecularly targeted agents, genetically agnostic small-molecule inhibitors, immunotherapies, and chemotherapy/epigenetic agents.

Multiple trials, for example, are examining a chemotherapy treatment CPX-351 (liposomal cytarabine-daunorubicin) in HR-MDS, and a 2018 study showed improvement in median survival in older patients with newly diagnosed secondary acute myeloid leukemia. “However, this remains an investigational treatment,” Dr. Zeidan cautioned.

Venetoclax is also being studied. Animal and cell culture data suggest there may be helpful synergistic activity between venetoclax and azacitidine in both the frontline and relapse settings. Dr. Zeidan highlighted his own 2019 report on a phase 1b study of venetoclax versus venetoclax and azacitidine in the HMA failure/HR-MDS setting. The results are “quite exciting,” he said.

The report noted that, “although the study is still ongoing, the 6-month OS [overall survival] estimate of 57% in monotherapy [patients] compares favorably to historical controls.”

Glasdegib is “another drug of interest,” although it’s mostly been studied in the frontline setting, he said, and “we don’t have much data with this drug in the refractory setting for MDS patients.” APR-246 is also intriguing, he said, but again lacks data in the refractory setting.

Dr. Zeidan noted research into other treatments – rigosertib (recent findings have been disappointing), ivosidenib for IDH1-mutated MDS, AG221-001 and enasidenib (targeting IDH2 mutations), trametinib (targeting RAS pathway mutations), and others. For now, “clinical trial participation should be the best way to manage these patients.”

Dr. Zeidan disclosed multiple disclosures, including relationships with Pfizer, Novartis, Abbvie, Pfizer, Medimmune/AstraZeneca and Boehringer Ingelheim, among others.

The Acute Leukemia Forum is held by Hemedicus, which is owned by the same company as this news organization.

Prognoses remain extremely poor after hypomethylating agents (HMAs) fail in patients with higher-risk myelodysplastic syndromes (HR-MDS). But a hematologist-oncologist told colleagues that novel therapies are in the works, and some show promise.

Still, “the clinical development for drugs in this setting has been quite challenging, and we have had a lot of drugs that have died in this space over the years,” cautioned Amer Zeidan, MBBS, MHS, an associate professor at Yale University, New Haven, Conn., in a presentation at the virtual Acute Leukemia Forum of Hemedicus. For now, “the best way to manage HMA failure in MDS patients is by preventing HMA failure.”

Dr. Zeidan highlighted a 2016 study – which he led – that found the median overall survival from diagnosis was just a median of 17.0 months (95% confidence interval, 15.8-18.4) in 632 patients with HR-MDS. Another 2016 study, which he also led, reported median overall survival of 11 months (95% CI, 10-14) and 12 months (95% CI, 11-16; P = .26) for patients aged 66 or older who had HR-MDS and took azacitidine and decitabine, respectively. Median survival is even shorter after HMA failure, he said.

The most important obstacle to effective therapy is “the biologic and molecular heterogeneity of the disease,” he said. “Only a certain number of genes are altered in a significant number of patients. And then you have a very long tail, with so many alterations, but most of them are rare. That makes targeting all patients with the same mechanism quite challenging. Also, we poorly understand how hypomethylating agents work and the mechanism of primary and secondary failure. And many MDS patients are older with multiple conditions, multiple comorbidities. By the time of failure, they are generally beaten up and very difficult to enroll in clinical trials.”

Even so, he said, “the understanding of the molecular pathogenesis of MDS is starting to open the door for new drug development opportunities. What’s been changing over the last 5 years is an increased understanding of targeting some of the alterations that are specific to the patient – individualized targeting or precision medicine.”
 

Novel therapies

Dr. Zeidan said the novel therapies for HR-MDS after HMA failure fall into these categories: molecularly targeted agents, genetically agnostic small-molecule inhibitors, immunotherapies, and chemotherapy/epigenetic agents.

Multiple trials, for example, are examining a chemotherapy treatment CPX-351 (liposomal cytarabine-daunorubicin) in HR-MDS, and a 2018 study showed improvement in median survival in older patients with newly diagnosed secondary acute myeloid leukemia. “However, this remains an investigational treatment,” Dr. Zeidan cautioned.

Venetoclax is also being studied. Animal and cell culture data suggest there may be helpful synergistic activity between venetoclax and azacitidine in both the frontline and relapse settings. Dr. Zeidan highlighted his own 2019 report on a phase 1b study of venetoclax versus venetoclax and azacitidine in the HMA failure/HR-MDS setting. The results are “quite exciting,” he said.

The report noted that, “although the study is still ongoing, the 6-month OS [overall survival] estimate of 57% in monotherapy [patients] compares favorably to historical controls.”

Glasdegib is “another drug of interest,” although it’s mostly been studied in the frontline setting, he said, and “we don’t have much data with this drug in the refractory setting for MDS patients.” APR-246 is also intriguing, he said, but again lacks data in the refractory setting.

Dr. Zeidan noted research into other treatments – rigosertib (recent findings have been disappointing), ivosidenib for IDH1-mutated MDS, AG221-001 and enasidenib (targeting IDH2 mutations), trametinib (targeting RAS pathway mutations), and others. For now, “clinical trial participation should be the best way to manage these patients.”

Dr. Zeidan disclosed multiple disclosures, including relationships with Pfizer, Novartis, Abbvie, Pfizer, Medimmune/AstraZeneca and Boehringer Ingelheim, among others.

The Acute Leukemia Forum is held by Hemedicus, which is owned by the same company as this news organization.

Prognoses remain extremely poor after hypomethylating agents (HMAs) fail in patients with higher-risk myelodysplastic syndromes (HR-MDS). But a hematologist-oncologist told colleagues that novel therapies are in the works, and some show promise.

Still, “the clinical development for drugs in this setting has been quite challenging, and we have had a lot of drugs that have died in this space over the years,” cautioned Amer Zeidan, MBBS, MHS, an associate professor at Yale University, New Haven, Conn., in a presentation at the virtual Acute Leukemia Forum of Hemedicus. For now, “the best way to manage HMA failure in MDS patients is by preventing HMA failure.”

Dr. Zeidan highlighted a 2016 study – which he led – that found the median overall survival from diagnosis was just a median of 17.0 months (95% confidence interval, 15.8-18.4) in 632 patients with HR-MDS. Another 2016 study, which he also led, reported median overall survival of 11 months (95% CI, 10-14) and 12 months (95% CI, 11-16; P = .26) for patients aged 66 or older who had HR-MDS and took azacitidine and decitabine, respectively. Median survival is even shorter after HMA failure, he said.

The most important obstacle to effective therapy is “the biologic and molecular heterogeneity of the disease,” he said. “Only a certain number of genes are altered in a significant number of patients. And then you have a very long tail, with so many alterations, but most of them are rare. That makes targeting all patients with the same mechanism quite challenging. Also, we poorly understand how hypomethylating agents work and the mechanism of primary and secondary failure. And many MDS patients are older with multiple conditions, multiple comorbidities. By the time of failure, they are generally beaten up and very difficult to enroll in clinical trials.”

Even so, he said, “the understanding of the molecular pathogenesis of MDS is starting to open the door for new drug development opportunities. What’s been changing over the last 5 years is an increased understanding of targeting some of the alterations that are specific to the patient – individualized targeting or precision medicine.”
 

Novel therapies

Dr. Zeidan said the novel therapies for HR-MDS after HMA failure fall into these categories: molecularly targeted agents, genetically agnostic small-molecule inhibitors, immunotherapies, and chemotherapy/epigenetic agents.

Multiple trials, for example, are examining a chemotherapy treatment CPX-351 (liposomal cytarabine-daunorubicin) in HR-MDS, and a 2018 study showed improvement in median survival in older patients with newly diagnosed secondary acute myeloid leukemia. “However, this remains an investigational treatment,” Dr. Zeidan cautioned.

Venetoclax is also being studied. Animal and cell culture data suggest there may be helpful synergistic activity between venetoclax and azacitidine in both the frontline and relapse settings. Dr. Zeidan highlighted his own 2019 report on a phase 1b study of venetoclax versus venetoclax and azacitidine in the HMA failure/HR-MDS setting. The results are “quite exciting,” he said.

The report noted that, “although the study is still ongoing, the 6-month OS [overall survival] estimate of 57% in monotherapy [patients] compares favorably to historical controls.”

Glasdegib is “another drug of interest,” although it’s mostly been studied in the frontline setting, he said, and “we don’t have much data with this drug in the refractory setting for MDS patients.” APR-246 is also intriguing, he said, but again lacks data in the refractory setting.

Dr. Zeidan noted research into other treatments – rigosertib (recent findings have been disappointing), ivosidenib for IDH1-mutated MDS, AG221-001 and enasidenib (targeting IDH2 mutations), trametinib (targeting RAS pathway mutations), and others. For now, “clinical trial participation should be the best way to manage these patients.”

Dr. Zeidan disclosed multiple disclosures, including relationships with Pfizer, Novartis, Abbvie, Pfizer, Medimmune/AstraZeneca and Boehringer Ingelheim, among others.

The Acute Leukemia Forum is held by Hemedicus, which is owned by the same company as this news organization.

Hematopoietic stem cell transplantation (HCT) is one of the most important treatment options for acute leukemias. However, posttransplant cancer recurrence remains a continuing issue. And while there are reasons to think that hypomethylating agents (HMAS) could be helpful as maintenance tools to prevent cancer recurrence after HCT in leukemia, a hematologist/oncologist told colleagues that the treatment isn’t yet ready for prime time.

“I don’t think you can prefer hypomethylating agents over anything right now. Unfortunately, there’s no data that we can hang our hat on that says they are of benefit in the posttransplant setting,” said Frederick Appelbaum, MD, executive vice president and deputy director of the Fred Hutchinson Cancer Research Center, Seattle, in a presentation at the virtual Acute Leukemia Forum of Hemedicus.

However, there’s still plenty of room for improvement for patients following HCT, he said, pointing to the findings of a 2020 study. The report, which he cowrote, found that 200-day mortality after HCT fell by a third from 2003-2007 to 2013-20017, but also noted that “relapse of cancer remains the largest obstacle to better survival outcomes.”

Dr. Appelbaum described the findings this way: “Without a doubt, the major limitation to transplants for hematologic malignancies today is disease recurrence,” he said. “In fact, if you look at patients after day 100, over 60% of the reason for failure is tumor regrowth. Thus, people are very anxious to look at any method that we can to prevent posttransplant relapse, including the use of hypomethylating agents.”

In regard to strategy, “we don’t have to get rid of every last leukemic cell. Just delaying recurrence might be enough,” he said. “If you can keep the patient from relapsing for the first 3 months, and then take the brakes off the immune suppression and allow immunity to regrow, that may be enough to allow increased numbers of patients to be cured of their disease.”
 

A potential role

Why might HMAS be a possible option after transplant? They do appear to play a role after chemotherapy, he said, pointing to four 2019 studies: One that examined decitabine and three that examined azacytidine: Here, here, and here.

“These four studies provide convincing evidence that hypomethylating-agent therapy after conventional chemotherapy may either prevent or delay relapse when given as maintenance,” Dr. Appelbaum said.

If HMAS work after standard chemotherapy, why might they fail to work after transplantation? “For one, by the time the disease has been able to go through chemotherapy and transplant, you’re left with highly resistant cells,” he said. “Therefore, hypomethylating agents may not be enough to get rid of the disease. Secondly, any of you who have tried to give a maintenance therapy after transplantation know how difficult it can be with CMV [cytomegalovirus] reactivation, count suppression with ganciclovir, graft-versus-host disease [GVHD] causing nausea and vomiting, diarrhea and renal dysfunction caused by calcineurin inhibitors. These are daily events during the first 3 months after transplantation, making drug administration difficult.”

In addition, he said, “even if you can give the drug, the clinical and disease variability may make it very difficult to detect an effect.”

In another study, researchers “did make a valiant attempt to study azacitidine in the posttransplant setting by randomizing 181 patients to either azacitidine or observation,” Dr. Appelbaum said. “Unfortunately, as they reported in 2018, they could not detect a difference in either disease-free or overall survival.”

The researchers reported that nearly 75% of patients in the azacitidine arm failed to complete the planned 12 cycles of treatment, he said. “The reasons for stopping the drug were pretty profound. Half of the patients stopped because they relapsed. Others had stopped because of grades three or four toxicity, death, or severe GVHD or significant infections. It is very difficult to give the drug.”

In the future, “if we truly want to optimize the benefit of using hypomethylating agents after transplantation, it’s going to be very important for us to understand how they work,” he said. “Understanding that would then help us to select which drug we should use, what the dosing and schedule might be, and also to select patients that might benefit from it. Unfortunately, right now, it’s pretty much of a black box. We don’t really understand the effects of hypomethylating agents in the posttransplant period.”

Still, he added, “without question, the results that we have seen with the use of hypomethylating agents after conventional chemotherapy – prolonging disease-free and, probably, overall survival – are going to provide a very, very strong stimulus to study hypomethylating agents after transplantation as well.”

Dr. Appelbaum reports no disclosures.

The Acute Leukemia Forum is held by Hemedicus, which is owned by the same company as this news organization.

Hematopoietic stem cell transplantation (HCT) is one of the most important treatment options for acute leukemias. However, posttransplant cancer recurrence remains a continuing issue. And while there are reasons to think that hypomethylating agents (HMAS) could be helpful as maintenance tools to prevent cancer recurrence after HCT in leukemia, a hematologist/oncologist told colleagues that the treatment isn’t yet ready for prime time.

“I don’t think you can prefer hypomethylating agents over anything right now. Unfortunately, there’s no data that we can hang our hat on that says they are of benefit in the posttransplant setting,” said Frederick Appelbaum, MD, executive vice president and deputy director of the Fred Hutchinson Cancer Research Center, Seattle, in a presentation at the virtual Acute Leukemia Forum of Hemedicus.

However, there’s still plenty of room for improvement for patients following HCT, he said, pointing to the findings of a 2020 study. The report, which he cowrote, found that 200-day mortality after HCT fell by a third from 2003-2007 to 2013-20017, but also noted that “relapse of cancer remains the largest obstacle to better survival outcomes.”

Dr. Appelbaum described the findings this way: “Without a doubt, the major limitation to transplants for hematologic malignancies today is disease recurrence,” he said. “In fact, if you look at patients after day 100, over 60% of the reason for failure is tumor regrowth. Thus, people are very anxious to look at any method that we can to prevent posttransplant relapse, including the use of hypomethylating agents.”

In regard to strategy, “we don’t have to get rid of every last leukemic cell. Just delaying recurrence might be enough,” he said. “If you can keep the patient from relapsing for the first 3 months, and then take the brakes off the immune suppression and allow immunity to regrow, that may be enough to allow increased numbers of patients to be cured of their disease.”
 

A potential role

Why might HMAS be a possible option after transplant? They do appear to play a role after chemotherapy, he said, pointing to four 2019 studies: One that examined decitabine and three that examined azacytidine: Here, here, and here.

“These four studies provide convincing evidence that hypomethylating-agent therapy after conventional chemotherapy may either prevent or delay relapse when given as maintenance,” Dr. Appelbaum said.

If HMAS work after standard chemotherapy, why might they fail to work after transplantation? “For one, by the time the disease has been able to go through chemotherapy and transplant, you’re left with highly resistant cells,” he said. “Therefore, hypomethylating agents may not be enough to get rid of the disease. Secondly, any of you who have tried to give a maintenance therapy after transplantation know how difficult it can be with CMV [cytomegalovirus] reactivation, count suppression with ganciclovir, graft-versus-host disease [GVHD] causing nausea and vomiting, diarrhea and renal dysfunction caused by calcineurin inhibitors. These are daily events during the first 3 months after transplantation, making drug administration difficult.”

In addition, he said, “even if you can give the drug, the clinical and disease variability may make it very difficult to detect an effect.”

In another study, researchers “did make a valiant attempt to study azacitidine in the posttransplant setting by randomizing 181 patients to either azacitidine or observation,” Dr. Appelbaum said. “Unfortunately, as they reported in 2018, they could not detect a difference in either disease-free or overall survival.”

The researchers reported that nearly 75% of patients in the azacitidine arm failed to complete the planned 12 cycles of treatment, he said. “The reasons for stopping the drug were pretty profound. Half of the patients stopped because they relapsed. Others had stopped because of grades three or four toxicity, death, or severe GVHD or significant infections. It is very difficult to give the drug.”

In the future, “if we truly want to optimize the benefit of using hypomethylating agents after transplantation, it’s going to be very important for us to understand how they work,” he said. “Understanding that would then help us to select which drug we should use, what the dosing and schedule might be, and also to select patients that might benefit from it. Unfortunately, right now, it’s pretty much of a black box. We don’t really understand the effects of hypomethylating agents in the posttransplant period.”

Still, he added, “without question, the results that we have seen with the use of hypomethylating agents after conventional chemotherapy – prolonging disease-free and, probably, overall survival – are going to provide a very, very strong stimulus to study hypomethylating agents after transplantation as well.”

Dr. Appelbaum reports no disclosures.

The Acute Leukemia Forum is held by Hemedicus, which is owned by the same company as this news organization.

Hematopoietic stem cell transplantation (HCT) is one of the most important treatment options for acute leukemias. However, posttransplant cancer recurrence remains a continuing issue. And while there are reasons to think that hypomethylating agents (HMAS) could be helpful as maintenance tools to prevent cancer recurrence after HCT in leukemia, a hematologist/oncologist told colleagues that the treatment isn’t yet ready for prime time.

“I don’t think you can prefer hypomethylating agents over anything right now. Unfortunately, there’s no data that we can hang our hat on that says they are of benefit in the posttransplant setting,” said Frederick Appelbaum, MD, executive vice president and deputy director of the Fred Hutchinson Cancer Research Center, Seattle, in a presentation at the virtual Acute Leukemia Forum of Hemedicus.

However, there’s still plenty of room for improvement for patients following HCT, he said, pointing to the findings of a 2020 study. The report, which he cowrote, found that 200-day mortality after HCT fell by a third from 2003-2007 to 2013-20017, but also noted that “relapse of cancer remains the largest obstacle to better survival outcomes.”

Dr. Appelbaum described the findings this way: “Without a doubt, the major limitation to transplants for hematologic malignancies today is disease recurrence,” he said. “In fact, if you look at patients after day 100, over 60% of the reason for failure is tumor regrowth. Thus, people are very anxious to look at any method that we can to prevent posttransplant relapse, including the use of hypomethylating agents.”

In regard to strategy, “we don’t have to get rid of every last leukemic cell. Just delaying recurrence might be enough,” he said. “If you can keep the patient from relapsing for the first 3 months, and then take the brakes off the immune suppression and allow immunity to regrow, that may be enough to allow increased numbers of patients to be cured of their disease.”
 

A potential role

Why might HMAS be a possible option after transplant? They do appear to play a role after chemotherapy, he said, pointing to four 2019 studies: One that examined decitabine and three that examined azacytidine: Here, here, and here.

“These four studies provide convincing evidence that hypomethylating-agent therapy after conventional chemotherapy may either prevent or delay relapse when given as maintenance,” Dr. Appelbaum said.

If HMAS work after standard chemotherapy, why might they fail to work after transplantation? “For one, by the time the disease has been able to go through chemotherapy and transplant, you’re left with highly resistant cells,” he said. “Therefore, hypomethylating agents may not be enough to get rid of the disease. Secondly, any of you who have tried to give a maintenance therapy after transplantation know how difficult it can be with CMV [cytomegalovirus] reactivation, count suppression with ganciclovir, graft-versus-host disease [GVHD] causing nausea and vomiting, diarrhea and renal dysfunction caused by calcineurin inhibitors. These are daily events during the first 3 months after transplantation, making drug administration difficult.”

In addition, he said, “even if you can give the drug, the clinical and disease variability may make it very difficult to detect an effect.”

In another study, researchers “did make a valiant attempt to study azacitidine in the posttransplant setting by randomizing 181 patients to either azacitidine or observation,” Dr. Appelbaum said. “Unfortunately, as they reported in 2018, they could not detect a difference in either disease-free or overall survival.”

The researchers reported that nearly 75% of patients in the azacitidine arm failed to complete the planned 12 cycles of treatment, he said. “The reasons for stopping the drug were pretty profound. Half of the patients stopped because they relapsed. Others had stopped because of grades three or four toxicity, death, or severe GVHD or significant infections. It is very difficult to give the drug.”

In the future, “if we truly want to optimize the benefit of using hypomethylating agents after transplantation, it’s going to be very important for us to understand how they work,” he said. “Understanding that would then help us to select which drug we should use, what the dosing and schedule might be, and also to select patients that might benefit from it. Unfortunately, right now, it’s pretty much of a black box. We don’t really understand the effects of hypomethylating agents in the posttransplant period.”

Still, he added, “without question, the results that we have seen with the use of hypomethylating agents after conventional chemotherapy – prolonging disease-free and, probably, overall survival – are going to provide a very, very strong stimulus to study hypomethylating agents after transplantation as well.”

Dr. Appelbaum reports no disclosures.

The Acute Leukemia Forum is held by Hemedicus, which is owned by the same company as this news organization.

Several recently approved and late-phase investigational agents may improve care for patients with higher risk myelodysplastic syndrome (MDS) by augmenting hypomethylating agents (HMAs), which are the current standard of care.

“HMA failure remains a challenge, and new approaches, such as ex vivo drug screening, are needed to improve outcomes,” said Brian A. Jonas, MD, PhD, from the University of California, Davis, in an online presentation during the virtual American Society of Hematology (ASH) Meeting on Hematologic Malignancies.

The goal of treatment for patients with higher-risk MDS – defined as a Revised International Prognostic Scoring System (R-IPSS) intermediate, high-risk, or very high–risk category – is to alter as much as possible the natural history of the disease.

Treatment options include monotherapy with HMAs, HMAs in combination with other agents, high-intensity chemotherapy, allogeneic hematopoietic stem cell transplant (allo-HSCT), or a clinical trial, Dr. Jonas said.
 

Improving bioavailability

Although HMAs, either azacitidine or decitabine, remain the standard of care for patients with higher-risk MDS, the oral bioavailability of these agents is limited by the rapid clearance of cytidine deaminase in the gut and liver.

But as Savona and colleagues reported in The Lancet Haematology, the combination of oral decitabine with cedazuridine, a novel cytidine deaminase inhibitor, significantly improved the bioavailability of the HMA, with an efficacy comparable to that of intravenous decitabine. The findings were confirmed by results from the phase 2 ASCERTAIN trial.

The combination (Inqovi) was approved by the US Food and Drug Administration in July 2020 for the treatment of MDS and chronic myelomonocytic leukemia in IPSS intermediate-1 or higher risk categories. The approved dose is 35 mg decitabine and 100 mg cedazuridine in a single oral tablet once daily on days 1 through 5 of each 28-day cycle.
 

New drugs, potential new targets

Another promising approach to improving HMA therapy is the combination of azacitidine and the BCL-2 inhibitor venetoclax (Venclexta).

Results of a phase 1b study of the combination as first-line therapy for patients with higher-risk MDS showed a combined complete response and marrow complete response rate of 77.2%, with estimated 6-month and 12-month survival rates of 100% and 93.8%, respectively, for patients who had a complete response and 85.9% at both 6 and 12 months for patients with a marrow complete response.

“The question is does this challenge the standard of care for higher-risk MDS? I would argue that many are using the regimen since the abstract came out, and I myself consider this regimen for use in select patients with high–blast count MDS who are maybe going to transplant or need to have their disease controlled rapidly,” Dr. Jonas said.

A randomized trial of the combination (NCT04401748) is currently recruiting.
 

Novel checkpoint inhibitor

Another promising combination pairs azacitidine with magrolimab, an experimental immune checkpoint inhibitor that targets CD47, the “don’t eat me” signal that inhibits macrophages from carrying out their crucial phagocytosis role.

As previously reported, magrolimab in combination with rituximab showed good efficacy in patients with relapsed or refractory indolent or aggressive non-Hodgkin lymphomas, and more recently showed promise in combination with azacitidine in a phase 1b study for the treatment of MDS and acute myeloid leukemia (AML).

Among patients with MDS in the trial, the overall response rate was 91% (30 of 33 patients). In all, 14 patients had complete responses, one had a partial response, eight had marrow complete responses, and seven had hematologic improvement.

The tolerability profile was similar to that seen with azacitidine monotherapy, with no significant worsening of cytopenias or infections or autoimmune adverse events. There were no deaths in the first 60 days on therapy, and no treatment discontinuation for drug-related adverse events.

Azacitidine was paired with a different novel agent, APR-246 in a clinical trial testing the combination in patients with TP53 mutant MDS and AML. APR-246 is a novel, first-in-class small molecule that binds covalently to p53, and selectively induces apoptosis in metastatic TP53 cells via thermodynamically stabilizing the p53 protein and shifting equilibrium toward the wild-type conformation.

Among 33 evaluable patients with higher-risk MDS, the combination was associated with an overall response in 29 (81%) including 20 patients (61%) with a complete response. After a median follow-up of 10.8 months, the median duration of response was 7.3 months, and 17 patients went on to allo-HSCT.

The combination of magrolimab and azacitidine has also shown preliminary activity in TP53-mutated MDS, Dr. Jonas noted.
 

HMA-refractory disease

Patients who experience disease progression to AML or to higher-risk MDS; have stable disease but no complete, partial, or marrow responses; or have hematologic improvement after four to six cycles of HMA may have primary resistance to this class of agents. Patients can also have disease that develops resistance to HMAs after an initial response.

“Unfortunately, the prognosis is very dismal for these patients,” with a median overall survival of 5.6 months and 2-year overall survival of just 15%, Dr. Jonas said.

As reported at the 2019 ASH annual meeting, in patients with relapsed/refractory MDS, venetoclax plus azacitidine was associated with a median progression-free survival of 9.1 months versus 3.3 months for venetoclax alone, and a median overall survival for the combination that was not reached, with a 12-month overall survival estimate of 65%. The median overall survival with venetoclax monotherapy was 5.5 months.

Adverse events included cytopenias, gastrointestinal events, and infections in both arms (ASH 2019 Abstract 565).

There are also data to suggest benefits of the isocitrate dehydrogenase inhibitors ivosidenib in patients with HMA-refractory MDS with IDH1 mutations and enasidenib in patients with HMA-refractory MDS with IDH2 mutations, Dr. Jonas said.

Finally, he described a pilot and feasibility study of ex vivo screening of myeloid neoplasms for drug sensitivity conducted at Stanford (Calif.) University. In 21 patients with HMA-refractory MDS, the ex vivo screening system provided results in a clinically actionable time frame comparable to that of a 596-gene panel. The positive predictive value of the screen was 92%, the negative predictive value was 82%, and the accuracy was 85%.

“This looks like a potentially promising approach to offer personalized therapy in patients with MDS,” he said.

No funding source for the presentation was reported. Dr. Jonas disclosed consulting activities for AbbVie, Celgen, GlycoMimetics, Jazz, Takeda, Tolero, and Treadwell; institutional research funding from multiple companies; and discussion of off-label use of various drugs not specifically approved for MDS.

Several recently approved and late-phase investigational agents may improve care for patients with higher risk myelodysplastic syndrome (MDS) by augmenting hypomethylating agents (HMAs), which are the current standard of care.

“HMA failure remains a challenge, and new approaches, such as ex vivo drug screening, are needed to improve outcomes,” said Brian A. Jonas, MD, PhD, from the University of California, Davis, in an online presentation during the virtual American Society of Hematology (ASH) Meeting on Hematologic Malignancies.

The goal of treatment for patients with higher-risk MDS – defined as a Revised International Prognostic Scoring System (R-IPSS) intermediate, high-risk, or very high–risk category – is to alter as much as possible the natural history of the disease.

Treatment options include monotherapy with HMAs, HMAs in combination with other agents, high-intensity chemotherapy, allogeneic hematopoietic stem cell transplant (allo-HSCT), or a clinical trial, Dr. Jonas said.
 

Improving bioavailability

Although HMAs, either azacitidine or decitabine, remain the standard of care for patients with higher-risk MDS, the oral bioavailability of these agents is limited by the rapid clearance of cytidine deaminase in the gut and liver.

But as Savona and colleagues reported in The Lancet Haematology, the combination of oral decitabine with cedazuridine, a novel cytidine deaminase inhibitor, significantly improved the bioavailability of the HMA, with an efficacy comparable to that of intravenous decitabine. The findings were confirmed by results from the phase 2 ASCERTAIN trial.

The combination (Inqovi) was approved by the US Food and Drug Administration in July 2020 for the treatment of MDS and chronic myelomonocytic leukemia in IPSS intermediate-1 or higher risk categories. The approved dose is 35 mg decitabine and 100 mg cedazuridine in a single oral tablet once daily on days 1 through 5 of each 28-day cycle.
 

New drugs, potential new targets

Another promising approach to improving HMA therapy is the combination of azacitidine and the BCL-2 inhibitor venetoclax (Venclexta).

Results of a phase 1b study of the combination as first-line therapy for patients with higher-risk MDS showed a combined complete response and marrow complete response rate of 77.2%, with estimated 6-month and 12-month survival rates of 100% and 93.8%, respectively, for patients who had a complete response and 85.9% at both 6 and 12 months for patients with a marrow complete response.

“The question is does this challenge the standard of care for higher-risk MDS? I would argue that many are using the regimen since the abstract came out, and I myself consider this regimen for use in select patients with high–blast count MDS who are maybe going to transplant or need to have their disease controlled rapidly,” Dr. Jonas said.

A randomized trial of the combination (NCT04401748) is currently recruiting.
 

Novel checkpoint inhibitor

Another promising combination pairs azacitidine with magrolimab, an experimental immune checkpoint inhibitor that targets CD47, the “don’t eat me” signal that inhibits macrophages from carrying out their crucial phagocytosis role.

As previously reported, magrolimab in combination with rituximab showed good efficacy in patients with relapsed or refractory indolent or aggressive non-Hodgkin lymphomas, and more recently showed promise in combination with azacitidine in a phase 1b study for the treatment of MDS and acute myeloid leukemia (AML).

Among patients with MDS in the trial, the overall response rate was 91% (30 of 33 patients). In all, 14 patients had complete responses, one had a partial response, eight had marrow complete responses, and seven had hematologic improvement.

The tolerability profile was similar to that seen with azacitidine monotherapy, with no significant worsening of cytopenias or infections or autoimmune adverse events. There were no deaths in the first 60 days on therapy, and no treatment discontinuation for drug-related adverse events.

Azacitidine was paired with a different novel agent, APR-246 in a clinical trial testing the combination in patients with TP53 mutant MDS and AML. APR-246 is a novel, first-in-class small molecule that binds covalently to p53, and selectively induces apoptosis in metastatic TP53 cells via thermodynamically stabilizing the p53 protein and shifting equilibrium toward the wild-type conformation.

Among 33 evaluable patients with higher-risk MDS, the combination was associated with an overall response in 29 (81%) including 20 patients (61%) with a complete response. After a median follow-up of 10.8 months, the median duration of response was 7.3 months, and 17 patients went on to allo-HSCT.

The combination of magrolimab and azacitidine has also shown preliminary activity in TP53-mutated MDS, Dr. Jonas noted.
 

HMA-refractory disease

Patients who experience disease progression to AML or to higher-risk MDS; have stable disease but no complete, partial, or marrow responses; or have hematologic improvement after four to six cycles of HMA may have primary resistance to this class of agents. Patients can also have disease that develops resistance to HMAs after an initial response.

“Unfortunately, the prognosis is very dismal for these patients,” with a median overall survival of 5.6 months and 2-year overall survival of just 15%, Dr. Jonas said.

As reported at the 2019 ASH annual meeting, in patients with relapsed/refractory MDS, venetoclax plus azacitidine was associated with a median progression-free survival of 9.1 months versus 3.3 months for venetoclax alone, and a median overall survival for the combination that was not reached, with a 12-month overall survival estimate of 65%. The median overall survival with venetoclax monotherapy was 5.5 months.

Adverse events included cytopenias, gastrointestinal events, and infections in both arms (ASH 2019 Abstract 565).

There are also data to suggest benefits of the isocitrate dehydrogenase inhibitors ivosidenib in patients with HMA-refractory MDS with IDH1 mutations and enasidenib in patients with HMA-refractory MDS with IDH2 mutations, Dr. Jonas said.

Finally, he described a pilot and feasibility study of ex vivo screening of myeloid neoplasms for drug sensitivity conducted at Stanford (Calif.) University. In 21 patients with HMA-refractory MDS, the ex vivo screening system provided results in a clinically actionable time frame comparable to that of a 596-gene panel. The positive predictive value of the screen was 92%, the negative predictive value was 82%, and the accuracy was 85%.

“This looks like a potentially promising approach to offer personalized therapy in patients with MDS,” he said.

No funding source for the presentation was reported. Dr. Jonas disclosed consulting activities for AbbVie, Celgen, GlycoMimetics, Jazz, Takeda, Tolero, and Treadwell; institutional research funding from multiple companies; and discussion of off-label use of various drugs not specifically approved for MDS.

Several recently approved and late-phase investigational agents may improve care for patients with higher risk myelodysplastic syndrome (MDS) by augmenting hypomethylating agents (HMAs), which are the current standard of care.

“HMA failure remains a challenge, and new approaches, such as ex vivo drug screening, are needed to improve outcomes,” said Brian A. Jonas, MD, PhD, from the University of California, Davis, in an online presentation during the virtual American Society of Hematology (ASH) Meeting on Hematologic Malignancies.

The goal of treatment for patients with higher-risk MDS – defined as a Revised International Prognostic Scoring System (R-IPSS) intermediate, high-risk, or very high–risk category – is to alter as much as possible the natural history of the disease.

Treatment options include monotherapy with HMAs, HMAs in combination with other agents, high-intensity chemotherapy, allogeneic hematopoietic stem cell transplant (allo-HSCT), or a clinical trial, Dr. Jonas said.
 

Improving bioavailability

Although HMAs, either azacitidine or decitabine, remain the standard of care for patients with higher-risk MDS, the oral bioavailability of these agents is limited by the rapid clearance of cytidine deaminase in the gut and liver.

But as Savona and colleagues reported in The Lancet Haematology, the combination of oral decitabine with cedazuridine, a novel cytidine deaminase inhibitor, significantly improved the bioavailability of the HMA, with an efficacy comparable to that of intravenous decitabine. The findings were confirmed by results from the phase 2 ASCERTAIN trial.

The combination (Inqovi) was approved by the US Food and Drug Administration in July 2020 for the treatment of MDS and chronic myelomonocytic leukemia in IPSS intermediate-1 or higher risk categories. The approved dose is 35 mg decitabine and 100 mg cedazuridine in a single oral tablet once daily on days 1 through 5 of each 28-day cycle.
 

New drugs, potential new targets

Another promising approach to improving HMA therapy is the combination of azacitidine and the BCL-2 inhibitor venetoclax (Venclexta).

Results of a phase 1b study of the combination as first-line therapy for patients with higher-risk MDS showed a combined complete response and marrow complete response rate of 77.2%, with estimated 6-month and 12-month survival rates of 100% and 93.8%, respectively, for patients who had a complete response and 85.9% at both 6 and 12 months for patients with a marrow complete response.

“The question is does this challenge the standard of care for higher-risk MDS? I would argue that many are using the regimen since the abstract came out, and I myself consider this regimen for use in select patients with high–blast count MDS who are maybe going to transplant or need to have their disease controlled rapidly,” Dr. Jonas said.

A randomized trial of the combination (NCT04401748) is currently recruiting.
 

Novel checkpoint inhibitor

Another promising combination pairs azacitidine with magrolimab, an experimental immune checkpoint inhibitor that targets CD47, the “don’t eat me” signal that inhibits macrophages from carrying out their crucial phagocytosis role.

As previously reported, magrolimab in combination with rituximab showed good efficacy in patients with relapsed or refractory indolent or aggressive non-Hodgkin lymphomas, and more recently showed promise in combination with azacitidine in a phase 1b study for the treatment of MDS and acute myeloid leukemia (AML).

Among patients with MDS in the trial, the overall response rate was 91% (30 of 33 patients). In all, 14 patients had complete responses, one had a partial response, eight had marrow complete responses, and seven had hematologic improvement.

The tolerability profile was similar to that seen with azacitidine monotherapy, with no significant worsening of cytopenias or infections or autoimmune adverse events. There were no deaths in the first 60 days on therapy, and no treatment discontinuation for drug-related adverse events.

Azacitidine was paired with a different novel agent, APR-246 in a clinical trial testing the combination in patients with TP53 mutant MDS and AML. APR-246 is a novel, first-in-class small molecule that binds covalently to p53, and selectively induces apoptosis in metastatic TP53 cells via thermodynamically stabilizing the p53 protein and shifting equilibrium toward the wild-type conformation.

Among 33 evaluable patients with higher-risk MDS, the combination was associated with an overall response in 29 (81%) including 20 patients (61%) with a complete response. After a median follow-up of 10.8 months, the median duration of response was 7.3 months, and 17 patients went on to allo-HSCT.

The combination of magrolimab and azacitidine has also shown preliminary activity in TP53-mutated MDS, Dr. Jonas noted.
 

HMA-refractory disease

Patients who experience disease progression to AML or to higher-risk MDS; have stable disease but no complete, partial, or marrow responses; or have hematologic improvement after four to six cycles of HMA may have primary resistance to this class of agents. Patients can also have disease that develops resistance to HMAs after an initial response.

“Unfortunately, the prognosis is very dismal for these patients,” with a median overall survival of 5.6 months and 2-year overall survival of just 15%, Dr. Jonas said.

As reported at the 2019 ASH annual meeting, in patients with relapsed/refractory MDS, venetoclax plus azacitidine was associated with a median progression-free survival of 9.1 months versus 3.3 months for venetoclax alone, and a median overall survival for the combination that was not reached, with a 12-month overall survival estimate of 65%. The median overall survival with venetoclax monotherapy was 5.5 months.

Adverse events included cytopenias, gastrointestinal events, and infections in both arms (ASH 2019 Abstract 565).

There are also data to suggest benefits of the isocitrate dehydrogenase inhibitors ivosidenib in patients with HMA-refractory MDS with IDH1 mutations and enasidenib in patients with HMA-refractory MDS with IDH2 mutations, Dr. Jonas said.

Finally, he described a pilot and feasibility study of ex vivo screening of myeloid neoplasms for drug sensitivity conducted at Stanford (Calif.) University. In 21 patients with HMA-refractory MDS, the ex vivo screening system provided results in a clinically actionable time frame comparable to that of a 596-gene panel. The positive predictive value of the screen was 92%, the negative predictive value was 82%, and the accuracy was 85%.

“This looks like a potentially promising approach to offer personalized therapy in patients with MDS,” he said.

No funding source for the presentation was reported. Dr. Jonas disclosed consulting activities for AbbVie, Celgen, GlycoMimetics, Jazz, Takeda, Tolero, and Treadwell; institutional research funding from multiple companies; and discussion of off-label use of various drugs not specifically approved for MDS.

Clinicians who treat patients with lower-risk myelodysplastic syndrome should focus on “what bugs patients most,” with therapeutic goals reflecting and respecting the patients’ goals, a specialist in MDS recommended.

“There’s an uncomfortable truth in treating lower-risk MDS: No treatment that we have has ever been demonstrated in a prospective trial to prolong survival in lower-risk MDS, so in the end, what we’re doing is trying to improve transfusion needs and to improve quality of life,” said Michael A. Sekeres, MD, MS, from the Cleveland Clinic.

Dr. Sekeres described optimal therapy for patients with lower-risk MDS in an online presentation during the virtual American Society of Hematology Meeting on Hematologic Malignancies.

He acknowledged that the definition of MDS as “a heterogeneous clonal hematopoietic disorder derived from an abnormal multipotent progenitor cell, characterized by a hyperproliferative bone marrow, dysplasia of the cellular elements, and ineffective hematopoiesis” can be confusing even for hematologists well versed in the disorder.

An easier-to-grasp explanation, he said, is that “MDS is considered a cancer, and like other cancers it has a clonal origin, involves the abnormal growth of cells that exceeds the growth of other cells around them and don’t know when to stop growing, and it takes over normal tissue, so that the normal tissues – in this case the hematopoietic precursors in the bone marrow – don’t function normally, resulting in cytopenias.”
 

‘Mild displeasure syndrome’

Approximately 95% of patients with MDS have a discrete genetic abnormality, but only one driver mutation, in the gene SF3B1, is considered to be a lower-risk abnormality, with a more favorable prognosis.

Treatment options for patients with lower-risk MDS, defined as an International Prognostic Scoring System score of 1 or less, or a Revised IPSS score of 3.5 or less, will depend on the patients’ transfusion needs and quality of life.

Patients with no transfusion requirements and a generally good quality of life may be followed by observation alone, with blood counts every 1 to 6 months depending on clinical presentation.

“We have some folks coming in who really don’t have very bad blood counts and have a good quality of life,” Dr. Sekeres said. “Those folks we would consider to have a very good risk type of MDS, which one of my patients referred to once as ‘mild displeasure syndrome.’ It was a displeasure to him to have to fight the traffic to come into Cleveland to see me every month, or 2 months, or 6 months, but beyond that we didn’t have to treat his MDS.”
 

Isolated cytopenias

Patients with isolated anemia, with hemoglobin less than 10 g/dL and/or transfusion dependence, and who are symptomatic should be started on an erythopoiesis-stimulating agent (ESA), either recombinant humanized erythropoietin or darbepoetin, or the erythroid-maturing agent luspatercept (Reblozyl).

The probability of a response to ESAs in this populations ranges from about 15% to 35%, with patients who have low baseline serum erythropoietin and no or few transfusions most likely to respond.

“On the other hand, patients who come into our clinic who are already dependent on red blood cell transfusions and have a sky-high [erythropoietin] level in the hundreds or even thousands have a very low likelihood of responding to exogenously administered ESAs,” he said.

Patients with no response to ESAs or luspatercept or a loss of response suggestive of disease progression should undergo repeat bone marrow biopsy. Patients who develop deletion 5q should be started on lenalidomide (Revlimid). In these patients, next-generation sequencing may also reveal targetable abnormalities.

For patients with isolated thrombocytopenia, thrombopoietin agonists such as romiplostim or eltrombopag may help to reduce platelet transfusion requirements and clinically significant bleeding events, but these agents come with a very important caveat: in addition to promoting platelet production, thrombopoietin receptor agonists can promote the growth of blasts, which could in turn promote the transformation of MDS to acute myeloid leukemia.

“This is an off-label use of romiplostim for the treatment of MDS with thrombocytopenia, and this drug should never, never, never be given to a patient who has excess blasts at baseline MDS; the same is true of its cousin eltrombopag.” Dr. Sekeres said.
 

Multlineage dysplasia

Patients with multilineage dysplasia can have good responses to hypomethylating agents, either azacitidine 75 mg/m2 IV or subcutaneously for 3 days every 4 weeks, or decitabine 20 mg/m² IV for 3 days every 4 weeks.

“Another approach to treating patients with multilineage dysplasia is to consider the use of antithymocyte globulin; in other words, treat these patients as if they have aplastic anemia, because there are some types of MDS in which immune-mediated destruction of bone marrow plays a role,” Dr. Sekeres said.

“This is particularly appealing in patients who have a hyperplastic marrow, or those who have other autoimmune conditions that are going on that may indicate a broader autoimmune process that’s involved in the bone marrow,” he added.

Patients treated with antithymocyte globulin require hospitalization with discharge on steroids for 1 month to prevent serum sickness in response to the treatment, and maintenance on low-dose cyclosporine.

“In MDS, unfortunately, our understanding of the biology of the disease far exceeds what we can do about it, but we’re starting to catch up,” Dr. Sekeres said.

No funding source for the presentation was disclosed. Dr. Sekeres disclosed serving on advisory boards for Celegene/Bristol-Myers Squibb, Takeda/Millenium, and Pfizer.

Clinicians who treat patients with lower-risk myelodysplastic syndrome should focus on “what bugs patients most,” with therapeutic goals reflecting and respecting the patients’ goals, a specialist in MDS recommended.

“There’s an uncomfortable truth in treating lower-risk MDS: No treatment that we have has ever been demonstrated in a prospective trial to prolong survival in lower-risk MDS, so in the end, what we’re doing is trying to improve transfusion needs and to improve quality of life,” said Michael A. Sekeres, MD, MS, from the Cleveland Clinic.

Dr. Sekeres described optimal therapy for patients with lower-risk MDS in an online presentation during the virtual American Society of Hematology Meeting on Hematologic Malignancies.

He acknowledged that the definition of MDS as “a heterogeneous clonal hematopoietic disorder derived from an abnormal multipotent progenitor cell, characterized by a hyperproliferative bone marrow, dysplasia of the cellular elements, and ineffective hematopoiesis” can be confusing even for hematologists well versed in the disorder.

An easier-to-grasp explanation, he said, is that “MDS is considered a cancer, and like other cancers it has a clonal origin, involves the abnormal growth of cells that exceeds the growth of other cells around them and don’t know when to stop growing, and it takes over normal tissue, so that the normal tissues – in this case the hematopoietic precursors in the bone marrow – don’t function normally, resulting in cytopenias.”
 

‘Mild displeasure syndrome’

Approximately 95% of patients with MDS have a discrete genetic abnormality, but only one driver mutation, in the gene SF3B1, is considered to be a lower-risk abnormality, with a more favorable prognosis.

Treatment options for patients with lower-risk MDS, defined as an International Prognostic Scoring System score of 1 or less, or a Revised IPSS score of 3.5 or less, will depend on the patients’ transfusion needs and quality of life.

Patients with no transfusion requirements and a generally good quality of life may be followed by observation alone, with blood counts every 1 to 6 months depending on clinical presentation.

“We have some folks coming in who really don’t have very bad blood counts and have a good quality of life,” Dr. Sekeres said. “Those folks we would consider to have a very good risk type of MDS, which one of my patients referred to once as ‘mild displeasure syndrome.’ It was a displeasure to him to have to fight the traffic to come into Cleveland to see me every month, or 2 months, or 6 months, but beyond that we didn’t have to treat his MDS.”
 

Isolated cytopenias

Patients with isolated anemia, with hemoglobin less than 10 g/dL and/or transfusion dependence, and who are symptomatic should be started on an erythopoiesis-stimulating agent (ESA), either recombinant humanized erythropoietin or darbepoetin, or the erythroid-maturing agent luspatercept (Reblozyl).

The probability of a response to ESAs in this populations ranges from about 15% to 35%, with patients who have low baseline serum erythropoietin and no or few transfusions most likely to respond.

“On the other hand, patients who come into our clinic who are already dependent on red blood cell transfusions and have a sky-high [erythropoietin] level in the hundreds or even thousands have a very low likelihood of responding to exogenously administered ESAs,” he said.

Patients with no response to ESAs or luspatercept or a loss of response suggestive of disease progression should undergo repeat bone marrow biopsy. Patients who develop deletion 5q should be started on lenalidomide (Revlimid). In these patients, next-generation sequencing may also reveal targetable abnormalities.

For patients with isolated thrombocytopenia, thrombopoietin agonists such as romiplostim or eltrombopag may help to reduce platelet transfusion requirements and clinically significant bleeding events, but these agents come with a very important caveat: in addition to promoting platelet production, thrombopoietin receptor agonists can promote the growth of blasts, which could in turn promote the transformation of MDS to acute myeloid leukemia.

“This is an off-label use of romiplostim for the treatment of MDS with thrombocytopenia, and this drug should never, never, never be given to a patient who has excess blasts at baseline MDS; the same is true of its cousin eltrombopag.” Dr. Sekeres said.
 

Multlineage dysplasia

Patients with multilineage dysplasia can have good responses to hypomethylating agents, either azacitidine 75 mg/m2 IV or subcutaneously for 3 days every 4 weeks, or decitabine 20 mg/m² IV for 3 days every 4 weeks.

“Another approach to treating patients with multilineage dysplasia is to consider the use of antithymocyte globulin; in other words, treat these patients as if they have aplastic anemia, because there are some types of MDS in which immune-mediated destruction of bone marrow plays a role,” Dr. Sekeres said.

“This is particularly appealing in patients who have a hyperplastic marrow, or those who have other autoimmune conditions that are going on that may indicate a broader autoimmune process that’s involved in the bone marrow,” he added.

Patients treated with antithymocyte globulin require hospitalization with discharge on steroids for 1 month to prevent serum sickness in response to the treatment, and maintenance on low-dose cyclosporine.

“In MDS, unfortunately, our understanding of the biology of the disease far exceeds what we can do about it, but we’re starting to catch up,” Dr. Sekeres said.

No funding source for the presentation was disclosed. Dr. Sekeres disclosed serving on advisory boards for Celegene/Bristol-Myers Squibb, Takeda/Millenium, and Pfizer.

Clinicians who treat patients with lower-risk myelodysplastic syndrome should focus on “what bugs patients most,” with therapeutic goals reflecting and respecting the patients’ goals, a specialist in MDS recommended.

“There’s an uncomfortable truth in treating lower-risk MDS: No treatment that we have has ever been demonstrated in a prospective trial to prolong survival in lower-risk MDS, so in the end, what we’re doing is trying to improve transfusion needs and to improve quality of life,” said Michael A. Sekeres, MD, MS, from the Cleveland Clinic.

Dr. Sekeres described optimal therapy for patients with lower-risk MDS in an online presentation during the virtual American Society of Hematology Meeting on Hematologic Malignancies.

He acknowledged that the definition of MDS as “a heterogeneous clonal hematopoietic disorder derived from an abnormal multipotent progenitor cell, characterized by a hyperproliferative bone marrow, dysplasia of the cellular elements, and ineffective hematopoiesis” can be confusing even for hematologists well versed in the disorder.

An easier-to-grasp explanation, he said, is that “MDS is considered a cancer, and like other cancers it has a clonal origin, involves the abnormal growth of cells that exceeds the growth of other cells around them and don’t know when to stop growing, and it takes over normal tissue, so that the normal tissues – in this case the hematopoietic precursors in the bone marrow – don’t function normally, resulting in cytopenias.”
 

‘Mild displeasure syndrome’

Approximately 95% of patients with MDS have a discrete genetic abnormality, but only one driver mutation, in the gene SF3B1, is considered to be a lower-risk abnormality, with a more favorable prognosis.

Treatment options for patients with lower-risk MDS, defined as an International Prognostic Scoring System score of 1 or less, or a Revised IPSS score of 3.5 or less, will depend on the patients’ transfusion needs and quality of life.

Patients with no transfusion requirements and a generally good quality of life may be followed by observation alone, with blood counts every 1 to 6 months depending on clinical presentation.

“We have some folks coming in who really don’t have very bad blood counts and have a good quality of life,” Dr. Sekeres said. “Those folks we would consider to have a very good risk type of MDS, which one of my patients referred to once as ‘mild displeasure syndrome.’ It was a displeasure to him to have to fight the traffic to come into Cleveland to see me every month, or 2 months, or 6 months, but beyond that we didn’t have to treat his MDS.”
 

Isolated cytopenias

Patients with isolated anemia, with hemoglobin less than 10 g/dL and/or transfusion dependence, and who are symptomatic should be started on an erythopoiesis-stimulating agent (ESA), either recombinant humanized erythropoietin or darbepoetin, or the erythroid-maturing agent luspatercept (Reblozyl).

The probability of a response to ESAs in this populations ranges from about 15% to 35%, with patients who have low baseline serum erythropoietin and no or few transfusions most likely to respond.

“On the other hand, patients who come into our clinic who are already dependent on red blood cell transfusions and have a sky-high [erythropoietin] level in the hundreds or even thousands have a very low likelihood of responding to exogenously administered ESAs,” he said.

Patients with no response to ESAs or luspatercept or a loss of response suggestive of disease progression should undergo repeat bone marrow biopsy. Patients who develop deletion 5q should be started on lenalidomide (Revlimid). In these patients, next-generation sequencing may also reveal targetable abnormalities.

For patients with isolated thrombocytopenia, thrombopoietin agonists such as romiplostim or eltrombopag may help to reduce platelet transfusion requirements and clinically significant bleeding events, but these agents come with a very important caveat: in addition to promoting platelet production, thrombopoietin receptor agonists can promote the growth of blasts, which could in turn promote the transformation of MDS to acute myeloid leukemia.

“This is an off-label use of romiplostim for the treatment of MDS with thrombocytopenia, and this drug should never, never, never be given to a patient who has excess blasts at baseline MDS; the same is true of its cousin eltrombopag.” Dr. Sekeres said.
 

Multlineage dysplasia

Patients with multilineage dysplasia can have good responses to hypomethylating agents, either azacitidine 75 mg/m2 IV or subcutaneously for 3 days every 4 weeks, or decitabine 20 mg/m² IV for 3 days every 4 weeks.

“Another approach to treating patients with multilineage dysplasia is to consider the use of antithymocyte globulin; in other words, treat these patients as if they have aplastic anemia, because there are some types of MDS in which immune-mediated destruction of bone marrow plays a role,” Dr. Sekeres said.

“This is particularly appealing in patients who have a hyperplastic marrow, or those who have other autoimmune conditions that are going on that may indicate a broader autoimmune process that’s involved in the bone marrow,” he added.

Patients treated with antithymocyte globulin require hospitalization with discharge on steroids for 1 month to prevent serum sickness in response to the treatment, and maintenance on low-dose cyclosporine.

“In MDS, unfortunately, our understanding of the biology of the disease far exceeds what we can do about it, but we’re starting to catch up,” Dr. Sekeres said.

No funding source for the presentation was disclosed. Dr. Sekeres disclosed serving on advisory boards for Celegene/Bristol-Myers Squibb, Takeda/Millenium, and Pfizer.