Bleeding Disorders

SPK-8011, an investigational adeno-associated virus (AAV)–mediated gene therapy for hemophilia A, provides stable and durable factor VIII expression with no major safety concerns, according to findings at least 2 years after a single treatment in patients from a phase 1/2 trial.

The first 5 of 14 adult men with hemophilia A and who had factor VIII (FVIII) activity of 2% or less before treatment with SPK-8011 (at single doses of either 5 × 10^{11 or 1} × 10¹² vg/kg), showed no development of FVIII inhibitors or evidence of FVIII cellular immune response at 106-142 weeks’ follow-up after vector infusion, according to Lindsey A. George, MD, at the International Society of Thrombosis and Haemostasis 2020 virtual congress.

At follow-up, the two who had received a 5 × 10¹¹ vg/kg dose had FVIII activity of 6.9%-8.4%, and the three in the 1 × 10¹² vg/kg cohort had FVIII activity of 5.2%-19.8%, said Dr. George, of the Children’s Hospital of Philadelphia.

Overall, 12 of the 14 patients in the study had sustained FVIII expression, including 7 of 9 who received the highest SPK-8011 dose of 2 × 10¹² vg/kg. In the 12 with sustained expression, a “remarkable” 91% reduction in the annualized bleeding rate from the year prior to vs. the year after vector infusion was observed, she said.

“Similarly, looking at number of factor infusions before vector infusion relative to the number of factor infusions after vector infusion ... [there was] evidence of remarkable preliminary efficacy,” she added, noting a 96% reduction in factor consumption.

The findings are of note because, while clinical studies of Spark Therapeutic’s SPK-8011 product in hemophilia B and preclinical models in hemophilia A showed promising reductions in bleeds and stable, durable levels of FVIII expression after therapy, the first successful clinical trial of an AAV-mediated gene therapy in hemophilia A – the BioMarin AAV serotype 5 human FVIII-SQ (valoctocogene roxaparvovec) – showed an unexpected decline in FVIII expression at 1, 2, 3, and 4 years.

“This may be particularly relevant in the context of development of multi-serotype AAV neutralizing antibodies (NAb) following AAV vector administration,” Dr. George said, referencing a small study in which she and her colleagues showed long-term persistence of cross-reactive AAV NAb. The findings of that study, which is currently in press in Molecular Therapy, “suggest that repeat AAV vector infusion is unlikely to be possible with current methods.”

Initial results from the SPK-8011 study were presented at the 2018 American Society of Hematology annual meeting. No major safety issues have emerged since those data were presented at ASH; no deaths have occurred, and none of the patients developed FVIII inhibitors.

Treatment-related adverse events were limited to an infusion reaction in one patient, which resolved completely, and liver enzyme elevations in three patients, which also resolved. One serious adverse event – a grade 2 transaminitis that resulted in elective hospitalization for intravenous steroid administration, also resolved.

With respect to vector clearance, there was “no evidence of vector in either saliva, semen, serum, urine, or peripheral blood mononuclear cells by 6 weeks after vector infusion,” Dr. George said.

One-stage assay determination of FVIII activity showed that activity greater than 10% permits an absolute bleeding rate (ABR) of less than 1%, which is consistent with hemophilia natural history studies. Therefore “these data support that FVIII activity that is approximately greater than 10% “may be adequate to either eliminate or achieve an ABR of less than 1,” she said.

“With respect to assay discrepancy, our data at least preliminarily support that the one-stage assay determinant of hepatocyte-derived FVIII correlates with clinical phenotype,” she added.

The findings in the first five patients demonstrate preliminary stability of FVIII expression at follow up between 2 and 3.3 years, she said.

Further, of the nine patients who received the 2 × 10¹² vg/kg dose, seven had sustained FVIII expression at about 1.5 years, five of the seven had no bleeds, and two lost FVIII expression and returned to prophylaxis uneventfully, she noted.

“The future directions of this work are ultimately to explore the optimal vector dose and immunosuppression regimens to achieve predictable, safe, efficacious, and durable FVIII expression,” she said.

Asked during a question and answer period about potential reasons for the differences in durability seen with SBK-8011 versus valoctocogene roxaparvovec, Dr. George said they remain unclear but could be related to differences in vector doses and manufacturing platforms.

Emerging data may allow for better comparisons, she added.

Session moderator Sebastien Lacroix-Desmazes, MD, of Centre de Recherche des Cordeliers, Paris, further asked about plans to optimize the immunosuppression regimen.

Plans are indeed in the works to identify the optimal immunosuppression regimen and to optimize immunosuppression in this trial, Dr. George said, noting that Spark Therapeutics “has outlined a plan to further investigate this in phase 1/2 trial before progressing into phase 3 study.”

Spark Therapeutic sponsored the SPK-8011 study. Dr. George disclosed consulting and/or data safety monitoring board activity for Pfizer and AvroBio.

[email protected]

SOURCE: George L et al. 2020 ISTH Congress, Abstract OC 03.5.

SPK-8011, an investigational adeno-associated virus (AAV)–mediated gene therapy for hemophilia A, provides stable and durable factor VIII expression with no major safety concerns, according to findings at least 2 years after a single treatment in patients from a phase 1/2 trial.

The first 5 of 14 adult men with hemophilia A and who had factor VIII (FVIII) activity of 2% or less before treatment with SPK-8011 (at single doses of either 5 × 10^{11 or 1} × 10¹² vg/kg), showed no development of FVIII inhibitors or evidence of FVIII cellular immune response at 106-142 weeks’ follow-up after vector infusion, according to Lindsey A. George, MD, at the International Society of Thrombosis and Haemostasis 2020 virtual congress.

At follow-up, the two who had received a 5 × 10¹¹ vg/kg dose had FVIII activity of 6.9%-8.4%, and the three in the 1 × 10¹² vg/kg cohort had FVIII activity of 5.2%-19.8%, said Dr. George, of the Children’s Hospital of Philadelphia.

Overall, 12 of the 14 patients in the study had sustained FVIII expression, including 7 of 9 who received the highest SPK-8011 dose of 2 × 10¹² vg/kg. In the 12 with sustained expression, a “remarkable” 91% reduction in the annualized bleeding rate from the year prior to vs. the year after vector infusion was observed, she said.

“Similarly, looking at number of factor infusions before vector infusion relative to the number of factor infusions after vector infusion ... [there was] evidence of remarkable preliminary efficacy,” she added, noting a 96% reduction in factor consumption.

The findings are of note because, while clinical studies of Spark Therapeutic’s SPK-8011 product in hemophilia B and preclinical models in hemophilia A showed promising reductions in bleeds and stable, durable levels of FVIII expression after therapy, the first successful clinical trial of an AAV-mediated gene therapy in hemophilia A – the BioMarin AAV serotype 5 human FVIII-SQ (valoctocogene roxaparvovec) – showed an unexpected decline in FVIII expression at 1, 2, 3, and 4 years.

“This may be particularly relevant in the context of development of multi-serotype AAV neutralizing antibodies (NAb) following AAV vector administration,” Dr. George said, referencing a small study in which she and her colleagues showed long-term persistence of cross-reactive AAV NAb. The findings of that study, which is currently in press in Molecular Therapy, “suggest that repeat AAV vector infusion is unlikely to be possible with current methods.”

Initial results from the SPK-8011 study were presented at the 2018 American Society of Hematology annual meeting. No major safety issues have emerged since those data were presented at ASH; no deaths have occurred, and none of the patients developed FVIII inhibitors.

Treatment-related adverse events were limited to an infusion reaction in one patient, which resolved completely, and liver enzyme elevations in three patients, which also resolved. One serious adverse event – a grade 2 transaminitis that resulted in elective hospitalization for intravenous steroid administration, also resolved.

With respect to vector clearance, there was “no evidence of vector in either saliva, semen, serum, urine, or peripheral blood mononuclear cells by 6 weeks after vector infusion,” Dr. George said.

One-stage assay determination of FVIII activity showed that activity greater than 10% permits an absolute bleeding rate (ABR) of less than 1%, which is consistent with hemophilia natural history studies. Therefore “these data support that FVIII activity that is approximately greater than 10% “may be adequate to either eliminate or achieve an ABR of less than 1,” she said.

“With respect to assay discrepancy, our data at least preliminarily support that the one-stage assay determinant of hepatocyte-derived FVIII correlates with clinical phenotype,” she added.

The findings in the first five patients demonstrate preliminary stability of FVIII expression at follow up between 2 and 3.3 years, she said.

Further, of the nine patients who received the 2 × 10¹² vg/kg dose, seven had sustained FVIII expression at about 1.5 years, five of the seven had no bleeds, and two lost FVIII expression and returned to prophylaxis uneventfully, she noted.

“The future directions of this work are ultimately to explore the optimal vector dose and immunosuppression regimens to achieve predictable, safe, efficacious, and durable FVIII expression,” she said.

Asked during a question and answer period about potential reasons for the differences in durability seen with SBK-8011 versus valoctocogene roxaparvovec, Dr. George said they remain unclear but could be related to differences in vector doses and manufacturing platforms.

Emerging data may allow for better comparisons, she added.

Session moderator Sebastien Lacroix-Desmazes, MD, of Centre de Recherche des Cordeliers, Paris, further asked about plans to optimize the immunosuppression regimen.

Plans are indeed in the works to identify the optimal immunosuppression regimen and to optimize immunosuppression in this trial, Dr. George said, noting that Spark Therapeutics “has outlined a plan to further investigate this in phase 1/2 trial before progressing into phase 3 study.”

Spark Therapeutic sponsored the SPK-8011 study. Dr. George disclosed consulting and/or data safety monitoring board activity for Pfizer and AvroBio.

[email protected]

SOURCE: George L et al. 2020 ISTH Congress, Abstract OC 03.5.

SPK-8011, an investigational adeno-associated virus (AAV)–mediated gene therapy for hemophilia A, provides stable and durable factor VIII expression with no major safety concerns, according to findings at least 2 years after a single treatment in patients from a phase 1/2 trial.

The first 5 of 14 adult men with hemophilia A and who had factor VIII (FVIII) activity of 2% or less before treatment with SPK-8011 (at single doses of either 5 × 10^{11 or 1} × 10¹² vg/kg), showed no development of FVIII inhibitors or evidence of FVIII cellular immune response at 106-142 weeks’ follow-up after vector infusion, according to Lindsey A. George, MD, at the International Society of Thrombosis and Haemostasis 2020 virtual congress.

At follow-up, the two who had received a 5 × 10¹¹ vg/kg dose had FVIII activity of 6.9%-8.4%, and the three in the 1 × 10¹² vg/kg cohort had FVIII activity of 5.2%-19.8%, said Dr. George, of the Children’s Hospital of Philadelphia.

Overall, 12 of the 14 patients in the study had sustained FVIII expression, including 7 of 9 who received the highest SPK-8011 dose of 2 × 10¹² vg/kg. In the 12 with sustained expression, a “remarkable” 91% reduction in the annualized bleeding rate from the year prior to vs. the year after vector infusion was observed, she said.

“Similarly, looking at number of factor infusions before vector infusion relative to the number of factor infusions after vector infusion ... [there was] evidence of remarkable preliminary efficacy,” she added, noting a 96% reduction in factor consumption.

The findings are of note because, while clinical studies of Spark Therapeutic’s SPK-8011 product in hemophilia B and preclinical models in hemophilia A showed promising reductions in bleeds and stable, durable levels of FVIII expression after therapy, the first successful clinical trial of an AAV-mediated gene therapy in hemophilia A – the BioMarin AAV serotype 5 human FVIII-SQ (valoctocogene roxaparvovec) – showed an unexpected decline in FVIII expression at 1, 2, 3, and 4 years.

“This may be particularly relevant in the context of development of multi-serotype AAV neutralizing antibodies (NAb) following AAV vector administration,” Dr. George said, referencing a small study in which she and her colleagues showed long-term persistence of cross-reactive AAV NAb. The findings of that study, which is currently in press in Molecular Therapy, “suggest that repeat AAV vector infusion is unlikely to be possible with current methods.”

Initial results from the SPK-8011 study were presented at the 2018 American Society of Hematology annual meeting. No major safety issues have emerged since those data were presented at ASH; no deaths have occurred, and none of the patients developed FVIII inhibitors.

Treatment-related adverse events were limited to an infusion reaction in one patient, which resolved completely, and liver enzyme elevations in three patients, which also resolved. One serious adverse event – a grade 2 transaminitis that resulted in elective hospitalization for intravenous steroid administration, also resolved.

With respect to vector clearance, there was “no evidence of vector in either saliva, semen, serum, urine, or peripheral blood mononuclear cells by 6 weeks after vector infusion,” Dr. George said.

One-stage assay determination of FVIII activity showed that activity greater than 10% permits an absolute bleeding rate (ABR) of less than 1%, which is consistent with hemophilia natural history studies. Therefore “these data support that FVIII activity that is approximately greater than 10% “may be adequate to either eliminate or achieve an ABR of less than 1,” she said.

“With respect to assay discrepancy, our data at least preliminarily support that the one-stage assay determinant of hepatocyte-derived FVIII correlates with clinical phenotype,” she added.

The findings in the first five patients demonstrate preliminary stability of FVIII expression at follow up between 2 and 3.3 years, she said.

Further, of the nine patients who received the 2 × 10¹² vg/kg dose, seven had sustained FVIII expression at about 1.5 years, five of the seven had no bleeds, and two lost FVIII expression and returned to prophylaxis uneventfully, she noted.

“The future directions of this work are ultimately to explore the optimal vector dose and immunosuppression regimens to achieve predictable, safe, efficacious, and durable FVIII expression,” she said.

Asked during a question and answer period about potential reasons for the differences in durability seen with SBK-8011 versus valoctocogene roxaparvovec, Dr. George said they remain unclear but could be related to differences in vector doses and manufacturing platforms.

Emerging data may allow for better comparisons, she added.

Session moderator Sebastien Lacroix-Desmazes, MD, of Centre de Recherche des Cordeliers, Paris, further asked about plans to optimize the immunosuppression regimen.

Plans are indeed in the works to identify the optimal immunosuppression regimen and to optimize immunosuppression in this trial, Dr. George said, noting that Spark Therapeutics “has outlined a plan to further investigate this in phase 1/2 trial before progressing into phase 3 study.”

Spark Therapeutic sponsored the SPK-8011 study. Dr. George disclosed consulting and/or data safety monitoring board activity for Pfizer and AvroBio.

[email protected]

SOURCE: George L et al. 2020 ISTH Congress, Abstract OC 03.5.

Factor VIII expression was detected on liver biopsies at more than 2 years after a single infusion of adeno-associated virus (AAV) gene therapy for hemophilia A in two patients who were part of a recent phase 1/2 study and who participated in an optional liver biopsy substudy.

The persistent factor VIII (FVIII) expression seen in the two patients was consistent with the presence of circularized, full-length human FVIII-SQ DNA in the biopsy samples and was observed in one patients at week 201 after infusion with 6 x 10¹² vg/kg of the AAV serotype 5 human FVIII-SQ gene therapy(valoctocogene roxaparvovec) and in another at week 140 after infusion with 4×10¹³ vg/kg, Sylvia Fong, PhD, reported during the International Society of Thrombosis and Haemostasis virtual congress.

The first patient had no FVIII detected in the plasma at the time of biopsy. The second had 28.4% of normal FVIII activity detected at the time of biopsy, said Dr. Fong of BioMarin Pharmaceutical, noting that alanine aminotransferase levels were normal at the time of biopsy for both subjects.

“Valoctocogene roxaparvovec is currently being evaluated in a phase 3 clinical study,” Dr. Fong said. “Data from the phase 1/2 trial have demonstrated preliminary proof of concept that valoctocogene roxaparvovec treatment, in many cases, eliminated spontaneous bleeds and the need for prophylactic factor VIII replacement.

“In addition, an acceptable safety profile was observed.”

Data from that trial were presented at the World Federation of Hemophilia virtual summit in June.
 

Liver biopsy for factor VIII expression

The current exploratory liver biopsy substudy – the first-in-human liver biopsy study after gene therapy for hemophilia A – was open to all phase 1/2 study participants and was initiated in September 2019 with multiple aims, including improved understanding of the durability and variability of AAV gene therapy, she explained.

Histopathological examination revealed normal liver architecture with mild steatosis and no evidence of steatohepatitis or significant inflammation in either participant. In the 6×10¹² vg/kg– and 4×10¹³ vg/kg–treated participants, a dose-dependent increase was seen in the percentage of hepatocytes that stained positive for vector genomes (1.3% and 32%, respectively), she said.

“This was very exciting to see,” she said, referring to the 32% stain-positive rate in the patient who received the 4x10¹³ vg/kg dose. “Not only were we able to detect vector genomes more than 2 years post-dose, there seems to be quite a bit of signals in this patient sample.”

The findings were similar to those seen in preclinical nonhuman primate models, she noted.

Dose-dependent increases were also seen in quantities of circular full-length/ITR-fused vector genomes and in FVIII-SQ RNA vector genomes; liver hFVIII-SQ RNA levels were 7.67×10² copies/mcg and 6.77×10⁴ copies/µg in the 6×10¹² vg/kg–treated participant the 4×10¹³ vg/kg–treated participant, respectively.

The circularized genomes were present as monomers and concatemers in both participants, and “were presumably associated with long-term expression,” Dr. Fong said.

Both participants are clinically stable with no long-term hepatic issues, she said, noting that analyses of results from additional participants in the substudy will be shared as they become available.

To date, because of “precious small amounts” of tissue available from the biopsy samples, Dr. Fong said she and her colleagues had not looked for degradation of the vectors.

Session moderator Sebastien Lacroix-Desmazes, MD, of Centre de recherche des Cordeliers, Paris, asked: “Is there a plan [to do so] or not, because I guess it’s a very important point,” to which Dr. Fong said that it is a possibility if adequate samples become available.

Dr. Fong is an employee of BioMarin Pharmaceuticals.

[email protected]

SOURCE: Fong S. 2020 ISTH Congress, Abstract OC 03.4.

Factor VIII expression was detected on liver biopsies at more than 2 years after a single infusion of adeno-associated virus (AAV) gene therapy for hemophilia A in two patients who were part of a recent phase 1/2 study and who participated in an optional liver biopsy substudy.

The persistent factor VIII (FVIII) expression seen in the two patients was consistent with the presence of circularized, full-length human FVIII-SQ DNA in the biopsy samples and was observed in one patients at week 201 after infusion with 6 x 10¹² vg/kg of the AAV serotype 5 human FVIII-SQ gene therapy(valoctocogene roxaparvovec) and in another at week 140 after infusion with 4×10¹³ vg/kg, Sylvia Fong, PhD, reported during the International Society of Thrombosis and Haemostasis virtual congress.

The first patient had no FVIII detected in the plasma at the time of biopsy. The second had 28.4% of normal FVIII activity detected at the time of biopsy, said Dr. Fong of BioMarin Pharmaceutical, noting that alanine aminotransferase levels were normal at the time of biopsy for both subjects.

“Valoctocogene roxaparvovec is currently being evaluated in a phase 3 clinical study,” Dr. Fong said. “Data from the phase 1/2 trial have demonstrated preliminary proof of concept that valoctocogene roxaparvovec treatment, in many cases, eliminated spontaneous bleeds and the need for prophylactic factor VIII replacement.

“In addition, an acceptable safety profile was observed.”

Data from that trial were presented at the World Federation of Hemophilia virtual summit in June.
 

Liver biopsy for factor VIII expression

The current exploratory liver biopsy substudy – the first-in-human liver biopsy study after gene therapy for hemophilia A – was open to all phase 1/2 study participants and was initiated in September 2019 with multiple aims, including improved understanding of the durability and variability of AAV gene therapy, she explained.

Histopathological examination revealed normal liver architecture with mild steatosis and no evidence of steatohepatitis or significant inflammation in either participant. In the 6×10¹² vg/kg– and 4×10¹³ vg/kg–treated participants, a dose-dependent increase was seen in the percentage of hepatocytes that stained positive for vector genomes (1.3% and 32%, respectively), she said.

“This was very exciting to see,” she said, referring to the 32% stain-positive rate in the patient who received the 4x10¹³ vg/kg dose. “Not only were we able to detect vector genomes more than 2 years post-dose, there seems to be quite a bit of signals in this patient sample.”

The findings were similar to those seen in preclinical nonhuman primate models, she noted.

Dose-dependent increases were also seen in quantities of circular full-length/ITR-fused vector genomes and in FVIII-SQ RNA vector genomes; liver hFVIII-SQ RNA levels were 7.67×10² copies/mcg and 6.77×10⁴ copies/µg in the 6×10¹² vg/kg–treated participant the 4×10¹³ vg/kg–treated participant, respectively.

The circularized genomes were present as monomers and concatemers in both participants, and “were presumably associated with long-term expression,” Dr. Fong said.

Both participants are clinically stable with no long-term hepatic issues, she said, noting that analyses of results from additional participants in the substudy will be shared as they become available.

To date, because of “precious small amounts” of tissue available from the biopsy samples, Dr. Fong said she and her colleagues had not looked for degradation of the vectors.

Session moderator Sebastien Lacroix-Desmazes, MD, of Centre de recherche des Cordeliers, Paris, asked: “Is there a plan [to do so] or not, because I guess it’s a very important point,” to which Dr. Fong said that it is a possibility if adequate samples become available.

Dr. Fong is an employee of BioMarin Pharmaceuticals.

[email protected]

SOURCE: Fong S. 2020 ISTH Congress, Abstract OC 03.4.

Factor VIII expression was detected on liver biopsies at more than 2 years after a single infusion of adeno-associated virus (AAV) gene therapy for hemophilia A in two patients who were part of a recent phase 1/2 study and who participated in an optional liver biopsy substudy.

The persistent factor VIII (FVIII) expression seen in the two patients was consistent with the presence of circularized, full-length human FVIII-SQ DNA in the biopsy samples and was observed in one patients at week 201 after infusion with 6 x 10¹² vg/kg of the AAV serotype 5 human FVIII-SQ gene therapy(valoctocogene roxaparvovec) and in another at week 140 after infusion with 4×10¹³ vg/kg, Sylvia Fong, PhD, reported during the International Society of Thrombosis and Haemostasis virtual congress.

The first patient had no FVIII detected in the plasma at the time of biopsy. The second had 28.4% of normal FVIII activity detected at the time of biopsy, said Dr. Fong of BioMarin Pharmaceutical, noting that alanine aminotransferase levels were normal at the time of biopsy for both subjects.

“Valoctocogene roxaparvovec is currently being evaluated in a phase 3 clinical study,” Dr. Fong said. “Data from the phase 1/2 trial have demonstrated preliminary proof of concept that valoctocogene roxaparvovec treatment, in many cases, eliminated spontaneous bleeds and the need for prophylactic factor VIII replacement.

“In addition, an acceptable safety profile was observed.”

Data from that trial were presented at the World Federation of Hemophilia virtual summit in June.
 

Liver biopsy for factor VIII expression

The current exploratory liver biopsy substudy – the first-in-human liver biopsy study after gene therapy for hemophilia A – was open to all phase 1/2 study participants and was initiated in September 2019 with multiple aims, including improved understanding of the durability and variability of AAV gene therapy, she explained.

Histopathological examination revealed normal liver architecture with mild steatosis and no evidence of steatohepatitis or significant inflammation in either participant. In the 6×10¹² vg/kg– and 4×10¹³ vg/kg–treated participants, a dose-dependent increase was seen in the percentage of hepatocytes that stained positive for vector genomes (1.3% and 32%, respectively), she said.

“This was very exciting to see,” she said, referring to the 32% stain-positive rate in the patient who received the 4x10¹³ vg/kg dose. “Not only were we able to detect vector genomes more than 2 years post-dose, there seems to be quite a bit of signals in this patient sample.”

The findings were similar to those seen in preclinical nonhuman primate models, she noted.

Dose-dependent increases were also seen in quantities of circular full-length/ITR-fused vector genomes and in FVIII-SQ RNA vector genomes; liver hFVIII-SQ RNA levels were 7.67×10² copies/mcg and 6.77×10⁴ copies/µg in the 6×10¹² vg/kg–treated participant the 4×10¹³ vg/kg–treated participant, respectively.

The circularized genomes were present as monomers and concatemers in both participants, and “were presumably associated with long-term expression,” Dr. Fong said.

Both participants are clinically stable with no long-term hepatic issues, she said, noting that analyses of results from additional participants in the substudy will be shared as they become available.

To date, because of “precious small amounts” of tissue available from the biopsy samples, Dr. Fong said she and her colleagues had not looked for degradation of the vectors.

Session moderator Sebastien Lacroix-Desmazes, MD, of Centre de recherche des Cordeliers, Paris, asked: “Is there a plan [to do so] or not, because I guess it’s a very important point,” to which Dr. Fong said that it is a possibility if adequate samples become available.

Dr. Fong is an employee of BioMarin Pharmaceuticals.

[email protected]

SOURCE: Fong S. 2020 ISTH Congress, Abstract OC 03.4.

Physician consensus and a broadly effective treatment for heavy menstrual bleeding was not found among young patients with inherited platelet function disorders, according to the results of a retrospective chart review reported in the Journal of Pediatric and Adolescent Gynecology.

Heavy menstrual bleeding (HMB) in girls with inherited platelet function disorders (IPFD) can be difficult to control despite ongoing follow-up and treatment changes, reported Christine M. Pennesi, MD, of the University of Michigan, Ann Arbor, and colleagues.

They assessed 34 young women and girls (ages 9-25 years) diagnosed with IPFDs referred to gynecology and/or hematology at a tertiary care hospital between 2006 and 2018.

Billing codes were used to determine hormonal or nonhormonal treatments, and outcomes over a 1- to 2-year period were collected. The initial treatment was defined as the first treatment prescribed after referral. The primary outcome was treatment failure, defined as a change in treatment method because of continued bleeding.

The majority (56%) of patients failed initial treatment (n = 19); among all 34 individuals followed in the study, an average of 2.7 total treatments were required.

Six patients (18%) remained uncontrolled despite numerous treatment changes (mean treatment changes, four; range, two to seven), and two patients (6%) remained uncontrolled because of noncompliance with treatment.

Overall, the researchers identified a 18% failure rate of successfully treatment of HMB in young women and girls with IPFDs over a 2-year follow-up period.

Of the 26 women who achieved control of HMB within 2-year follow-up, 54% (n = 14) were on hormonal treatments, 27% (n = 7) on nonhormonal treatments, 12% (n = 3) on combined treatments, and 8% (n = 2) on no treatment at time of control, the authors stated.

“The heterogeneity in treatments that were described in this study, clearly demonstrate that, in selecting treatment methods for HMB in young women, other considerations are often in play. This includes patient preference and need for contraception. Some patients or parents may have personal or religious objections to hormonal methods or worry about hormones in this young age group,” the researchers speculated.

“Appropriate counseling in these patients should include that it would not be unexpected for a patient to need more than one treatment before control of bleeding is achieved. This may help to alleviate the fear of teenagers when continued bleeding occurs after starting their initial treatment,” Dr. Pennesi and colleagues concluded.

One of the authors participated in funded trials and received funding from several pharmaceutical companies. The others reported having no disclosures.

[email protected]

SOURCE: Pennesi CM et al. J Pediatr Adolesc Gynecol. 2020 Jun 22. doi: 10.1016/j.jpag.2020.06.019.

Physician consensus and a broadly effective treatment for heavy menstrual bleeding was not found among young patients with inherited platelet function disorders, according to the results of a retrospective chart review reported in the Journal of Pediatric and Adolescent Gynecology.

Heavy menstrual bleeding (HMB) in girls with inherited platelet function disorders (IPFD) can be difficult to control despite ongoing follow-up and treatment changes, reported Christine M. Pennesi, MD, of the University of Michigan, Ann Arbor, and colleagues.

They assessed 34 young women and girls (ages 9-25 years) diagnosed with IPFDs referred to gynecology and/or hematology at a tertiary care hospital between 2006 and 2018.

Billing codes were used to determine hormonal or nonhormonal treatments, and outcomes over a 1- to 2-year period were collected. The initial treatment was defined as the first treatment prescribed after referral. The primary outcome was treatment failure, defined as a change in treatment method because of continued bleeding.

The majority (56%) of patients failed initial treatment (n = 19); among all 34 individuals followed in the study, an average of 2.7 total treatments were required.

Six patients (18%) remained uncontrolled despite numerous treatment changes (mean treatment changes, four; range, two to seven), and two patients (6%) remained uncontrolled because of noncompliance with treatment.

Overall, the researchers identified a 18% failure rate of successfully treatment of HMB in young women and girls with IPFDs over a 2-year follow-up period.

Of the 26 women who achieved control of HMB within 2-year follow-up, 54% (n = 14) were on hormonal treatments, 27% (n = 7) on nonhormonal treatments, 12% (n = 3) on combined treatments, and 8% (n = 2) on no treatment at time of control, the authors stated.

“The heterogeneity in treatments that were described in this study, clearly demonstrate that, in selecting treatment methods for HMB in young women, other considerations are often in play. This includes patient preference and need for contraception. Some patients or parents may have personal or religious objections to hormonal methods or worry about hormones in this young age group,” the researchers speculated.

“Appropriate counseling in these patients should include that it would not be unexpected for a patient to need more than one treatment before control of bleeding is achieved. This may help to alleviate the fear of teenagers when continued bleeding occurs after starting their initial treatment,” Dr. Pennesi and colleagues concluded.

One of the authors participated in funded trials and received funding from several pharmaceutical companies. The others reported having no disclosures.

[email protected]

SOURCE: Pennesi CM et al. J Pediatr Adolesc Gynecol. 2020 Jun 22. doi: 10.1016/j.jpag.2020.06.019.

Physician consensus and a broadly effective treatment for heavy menstrual bleeding was not found among young patients with inherited platelet function disorders, according to the results of a retrospective chart review reported in the Journal of Pediatric and Adolescent Gynecology.

Heavy menstrual bleeding (HMB) in girls with inherited platelet function disorders (IPFD) can be difficult to control despite ongoing follow-up and treatment changes, reported Christine M. Pennesi, MD, of the University of Michigan, Ann Arbor, and colleagues.

They assessed 34 young women and girls (ages 9-25 years) diagnosed with IPFDs referred to gynecology and/or hematology at a tertiary care hospital between 2006 and 2018.

Billing codes were used to determine hormonal or nonhormonal treatments, and outcomes over a 1- to 2-year period were collected. The initial treatment was defined as the first treatment prescribed after referral. The primary outcome was treatment failure, defined as a change in treatment method because of continued bleeding.

The majority (56%) of patients failed initial treatment (n = 19); among all 34 individuals followed in the study, an average of 2.7 total treatments were required.

Six patients (18%) remained uncontrolled despite numerous treatment changes (mean treatment changes, four; range, two to seven), and two patients (6%) remained uncontrolled because of noncompliance with treatment.

Overall, the researchers identified a 18% failure rate of successfully treatment of HMB in young women and girls with IPFDs over a 2-year follow-up period.

Of the 26 women who achieved control of HMB within 2-year follow-up, 54% (n = 14) were on hormonal treatments, 27% (n = 7) on nonhormonal treatments, 12% (n = 3) on combined treatments, and 8% (n = 2) on no treatment at time of control, the authors stated.

“The heterogeneity in treatments that were described in this study, clearly demonstrate that, in selecting treatment methods for HMB in young women, other considerations are often in play. This includes patient preference and need for contraception. Some patients or parents may have personal or religious objections to hormonal methods or worry about hormones in this young age group,” the researchers speculated.

“Appropriate counseling in these patients should include that it would not be unexpected for a patient to need more than one treatment before control of bleeding is achieved. This may help to alleviate the fear of teenagers when continued bleeding occurs after starting their initial treatment,” Dr. Pennesi and colleagues concluded.

One of the authors participated in funded trials and received funding from several pharmaceutical companies. The others reported having no disclosures.

[email protected]

SOURCE: Pennesi CM et al. J Pediatr Adolesc Gynecol. 2020 Jun 22. doi: 10.1016/j.jpag.2020.06.019.

Subcutaneous hepatitis A vaccination is as effective and may be safer for patients with bleeding disorders, according to a study by Mayumi Nakasone, MD, and colleagues.

MarianVejcik/Getty Images

The large number of donor exposures in bleeding disorder patients who require routine use of clotting factor concentrates remains a concern with regard to the risk of virus infection. Therefore, vaccinations for viruses such as hepatitis A are recommended. Although the intramuscular (IM) route is recommended for hepatitis A vaccination, patients with bleeding disorders have been advised to avoid IM injections because of the risk of bleeding and bruising of muscles, requiring infusion of clotting factor concentrates or other blood products for its treatment, according to Dr. Nakasone of the University of São Paulo and colleagues. They assessed 78 adult and pediatric patients with blood disorders randomized to vaccination for hepatitis A either subcutaneously (SC) or IM, according their study published on Vaccine.

The study was conducted at a single hemophilia center between May 2006 and February 2017.

Among the 78 patients, 58 (74.4%) presented hemophilia A (34 of the SC group and 24 of the IM group), 13 (16.7%) hemophilia B (4 of the SC group and 9 of the IM group) and 7 (8.9%) other bleeding disorders. There were no statistically significant differences between the SC and the IM groups in patients diagnosis or sex.

A total of 38 patients had serology performed after the first vaccine dose, determining seroconversion rates of 83.3% and 90.0% for the SC and the IM group, respectively, a nonsignificant difference. After the second vaccine dose, the seroconversion rate for the SC group was 97.5% and for the IM group was 97.4%, also a nonsignificant difference.

At a median of 9 years after a second vaccine dose, antibody titers for the SC group were slightly greater than the IM group (7.6 vs. 7.4), but this was also not a significant difference. There were no serious adverse events in both groups, according to Dr. Nakasone and colleagues. And although twice as many patients of the IM group required clotting factor concentrates for adverse events, compared with the SC group (15.8% vs. 7.5%), the difference was not significant.

“Hepatitis A vaccine administered subcutaneously is as immunogenic, long-term protective, and even safer as the intramuscular route for both children and adults not only with hemophilia, but also with other bleeding disorders,” the researchers concluded.

The authors declared that they had no disclosures.

[email protected]

SOURCE: Nakasone M et al. Vaccine 2020;38:4162-6.

Subcutaneous hepatitis A vaccination is as effective and may be safer for patients with bleeding disorders, according to a study by Mayumi Nakasone, MD, and colleagues.

MarianVejcik/Getty Images

The large number of donor exposures in bleeding disorder patients who require routine use of clotting factor concentrates remains a concern with regard to the risk of virus infection. Therefore, vaccinations for viruses such as hepatitis A are recommended. Although the intramuscular (IM) route is recommended for hepatitis A vaccination, patients with bleeding disorders have been advised to avoid IM injections because of the risk of bleeding and bruising of muscles, requiring infusion of clotting factor concentrates or other blood products for its treatment, according to Dr. Nakasone of the University of São Paulo and colleagues. They assessed 78 adult and pediatric patients with blood disorders randomized to vaccination for hepatitis A either subcutaneously (SC) or IM, according their study published on Vaccine.

The study was conducted at a single hemophilia center between May 2006 and February 2017.

Among the 78 patients, 58 (74.4%) presented hemophilia A (34 of the SC group and 24 of the IM group), 13 (16.7%) hemophilia B (4 of the SC group and 9 of the IM group) and 7 (8.9%) other bleeding disorders. There were no statistically significant differences between the SC and the IM groups in patients diagnosis or sex.

A total of 38 patients had serology performed after the first vaccine dose, determining seroconversion rates of 83.3% and 90.0% for the SC and the IM group, respectively, a nonsignificant difference. After the second vaccine dose, the seroconversion rate for the SC group was 97.5% and for the IM group was 97.4%, also a nonsignificant difference.

At a median of 9 years after a second vaccine dose, antibody titers for the SC group were slightly greater than the IM group (7.6 vs. 7.4), but this was also not a significant difference. There were no serious adverse events in both groups, according to Dr. Nakasone and colleagues. And although twice as many patients of the IM group required clotting factor concentrates for adverse events, compared with the SC group (15.8% vs. 7.5%), the difference was not significant.

“Hepatitis A vaccine administered subcutaneously is as immunogenic, long-term protective, and even safer as the intramuscular route for both children and adults not only with hemophilia, but also with other bleeding disorders,” the researchers concluded.

The authors declared that they had no disclosures.

[email protected]

SOURCE: Nakasone M et al. Vaccine 2020;38:4162-6.

Subcutaneous hepatitis A vaccination is as effective and may be safer for patients with bleeding disorders, according to a study by Mayumi Nakasone, MD, and colleagues.

MarianVejcik/Getty Images

The large number of donor exposures in bleeding disorder patients who require routine use of clotting factor concentrates remains a concern with regard to the risk of virus infection. Therefore, vaccinations for viruses such as hepatitis A are recommended. Although the intramuscular (IM) route is recommended for hepatitis A vaccination, patients with bleeding disorders have been advised to avoid IM injections because of the risk of bleeding and bruising of muscles, requiring infusion of clotting factor concentrates or other blood products for its treatment, according to Dr. Nakasone of the University of São Paulo and colleagues. They assessed 78 adult and pediatric patients with blood disorders randomized to vaccination for hepatitis A either subcutaneously (SC) or IM, according their study published on Vaccine.

The study was conducted at a single hemophilia center between May 2006 and February 2017.

Among the 78 patients, 58 (74.4%) presented hemophilia A (34 of the SC group and 24 of the IM group), 13 (16.7%) hemophilia B (4 of the SC group and 9 of the IM group) and 7 (8.9%) other bleeding disorders. There were no statistically significant differences between the SC and the IM groups in patients diagnosis or sex.

A total of 38 patients had serology performed after the first vaccine dose, determining seroconversion rates of 83.3% and 90.0% for the SC and the IM group, respectively, a nonsignificant difference. After the second vaccine dose, the seroconversion rate for the SC group was 97.5% and for the IM group was 97.4%, also a nonsignificant difference.

At a median of 9 years after a second vaccine dose, antibody titers for the SC group were slightly greater than the IM group (7.6 vs. 7.4), but this was also not a significant difference. There were no serious adverse events in both groups, according to Dr. Nakasone and colleagues. And although twice as many patients of the IM group required clotting factor concentrates for adverse events, compared with the SC group (15.8% vs. 7.5%), the difference was not significant.

“Hepatitis A vaccine administered subcutaneously is as immunogenic, long-term protective, and even safer as the intramuscular route for both children and adults not only with hemophilia, but also with other bleeding disorders,” the researchers concluded.

The authors declared that they had no disclosures.

[email protected]

SOURCE: Nakasone M et al. Vaccine 2020;38:4162-6.

Results from a prospective, multicenter, uncontrolled series of just over 1,500 patients with high bleeding risk who underwent coronary revascularization with a polymer-based, zotarolimus-eluting stent showed that these patients could safely receive dual-antiplatelet therapy (DAPT)for just 1 month.

This finding sets the stage for a new labeled indication for this device and management strategy in this patient population.

Results from the Onyx ONE Clear study “met its primary endpoint, with favorable rates of ischemic outcomes from 1-12 months after DAPT discontinuation within a high risk population of HBR [high-bleeding-risk] patients,” Ajay J. Kirtane, MD, said at the joint scientific sessions of the American College of Cardiology and the World Heart Federation. The meeting was conducted online after its cancellation because of the COVID-19 pandemic. The rate of cardiac death or MI during months 1-12 of follow-up while patients were on single-antiplatelet therapy (SAPT) with either aspirin or a P2Y12 inhibitor, usually clopidogrel, was 7.0%, compared with a prespecified performance goal of 9.7% or less, a goal set in consultation with and approval from the Food and Drug Administration based on the results from earlier, short DAPT studies in HBR patients.

“We hope these data will support our submission to the FDA for a 1-month DAPT indication for high-bleeding-risk patients treated with Resolute Onyx,” the polymer-based, zotarolimus-eluting stent tested in the study, said an officer with Medtronic, the company that sponsored this study and markets this stent, in a written statement. Currently, no stent has received a U.S. indication for just 1 month of DAPT treatment.

Mitchel L. Zoler/MDedge News

“The Onyx ONE Clear study represents the largest analysis of 1-month DAPT among commercially available DES [drug-eluting stents], and extends findings from the Onyx ONE [randomized, controlled trial] assuring the safety of a 1-month DAPT strategy among selected patients with high bleeding risk,” said David E. Kandzari, MD, director of interventional cardiology at Piedmont Healthcare in Atlanta and coprincipal investigator for the study along with Dr. Kirtane.

“Despite the patient complexity included in the study, the observation of a favorably low rate of ischemic events despite abbreviated DAPT is consistent with a theme from other contemporary studies that, among HBR patients, bleeding risk rather than ischemic risk should guide clinical decision making regarding DAPT duration,” Dr. Kandzari said in an interview.
 

Two similar trials

The Onyx ONE Clear results were consistent with findings from a study with a somewhat similar design, LEADERS FREE II, a single-arm study that assessed the safety and efficacy of BioFreedom, a polymer-free umirolimus-coated coronary stent, in HBR patients treated with DAPT for 1 month followed by SAPT.

LEADERS FREE II showed a 12-month cardiac death or MI rate of 8.6% that compared favorably with the 12.3% 1-year rate among similar patients who received bare-metal stents and a similar timing of DAPT and SAPT in a historical control group (Circ Cardiovasc Interv. 2020 Apr 13. doi: 10.1161/CIRCINTERVENTIONS.119.008603). The primary goal of LEADERS FREE II was to serve as the pivotal trial for FDA approval of the BioFreedom stent, but as of May 2020 the FDA had not approved this stent for U.S. use.

Results of another recent study, Onyx ONE, that supplied more than half the patients included in the Onyx ONE Clear analysis, showed that, in a head-to-head comparison of the Onxy and BioFreedom stents in 1,996 HBR patients treated with DAPT for 1 month followed by 11 months of SAPT, the Onyx stent was noninferior for both a primary safety outcome and a secondary efficacy outcome (N Engl J Med. 2020 Mar 26;382[13]:1208-18).

“The major differences” between the Onyx and BioFreedom stents in the patients studied in Onxy ONE Clear and in LEADERS FREE II “lie in the fact that BioFreedom is not approved in the U.S., and that Onyx is a current generation, preferred DES platform for both conventional and HBR patients,” Dr. Kirtane said in an interview.

“Because of the performance characteristics of Onyx, as well as the fact that ONYX ONE studied a far more complex group of patients than other shorter DAPT studies with conventional DES, I personally feel that there will be a preference to use this stent as a result of these data,” added Dr. Kirtane, professor of medicine at Columbia University and director of the coronary catheterization laboratory at New York–Presbyterian Hospital in New York.

The results from Onyx ONE “are critical for changing practice” among U.S. interventionalists, commented Sunil V. Rao, MD, an interventional cardiologist and professor of medicine at Duke University, Durham, N.C. Based on the new findings, U.S. operators performing percutaneous coronary interventions “will feel comfortable stopping DAPT in patients who are at high bleeding risk,” he said in an interview.

Although the results from LEADERS FREE II showed that the BioFreedom stent was superior to a bare-metal stent with 1 month of DAPT in HBR patients, and the results from Onyx ONE showed that the Onyx stent was noninferior to BioFreedom in this setting, “it’s important not to assume that there is a class effect across DES platforms. Each platform has a different drug and different stent design, so the interventional community needs to see these data for each DES,” Dr. Rao maintained.
 

Onyx ONE Clear design

Onyx ONE Clear enrolled a total of 1,506 patients, including more than 1,000 patients who received the Onyx stent in the Onyx ONE trial and an additional 752 patients enrolled in the United States and Japan, but 263 of these patients had an adverse event during their first 30 days or follow-up leaving 1,506 patients eligible to continue into the Onyx ONE Clear analysis, and with 1,491 patients followed through 12 months. Patients were an average age of 74 years, a little over two-thirds were men, 49% had a recent acute coronary syndrome event and 41% had chronic coronary syndrome. The choice of which antiplatelet agent to continue when patients transitioned to SAPT after 30 days on DAPT was left to the discretion of the physicians for each enrolled patient.

One issue these studies did not address was whether 1 month is the ideal duration for DAPT before switching to SAPT in HBR patients following coronary stenting, or whether longer DAPT durations produce even better outcomes. “It was important to establish what happens if we need to stop DAPT early.” The Onyx ONE and Onyx ONE Clear studies “provide much-needed data informing clinicians of the risks and safety of SAPT after 1 month in appropriately selected patients,” Dr. Kirtane said.

“The results do not indicate that all HBR patients should be treated with 1 month [of] DAPT, but instead demonstrate the safety and effectiveness of this strategy when clinically appropriate.” This scenario “is quite common, given that HBR patients represent up to a third” of patients undergoing percutaneous coronary intervention, Dr. Kandzari said.

Onyx ONE and Onyx ONE Clear were sponsored by Medtronic, the company that markets the Onyx coronary stent. Dr. Kirtane’s institution has received research support from Medtronic, and from Abbott Vascular, Abiomed, Boston Scientific, Cathworks, CSI, Philips, ReCor Medical, and Siemens. Dr. Kandzari has received personal fees and research grants from medtronic, personal fees from Biotronik and Cardiovascular Systems, and research grants from Biotronik, Boston Scientific, and Cardiovascular Systems. Dr. Rao has received personal fees from Medtronic, as well as from CSI and Philips.

[email protected]

SOURCE: Kirtane AJ et al. ACC 2020, Abstract 903-06.

Results from a prospective, multicenter, uncontrolled series of just over 1,500 patients with high bleeding risk who underwent coronary revascularization with a polymer-based, zotarolimus-eluting stent showed that these patients could safely receive dual-antiplatelet therapy (DAPT)for just 1 month.

This finding sets the stage for a new labeled indication for this device and management strategy in this patient population.

Results from the Onyx ONE Clear study “met its primary endpoint, with favorable rates of ischemic outcomes from 1-12 months after DAPT discontinuation within a high risk population of HBR [high-bleeding-risk] patients,” Ajay J. Kirtane, MD, said at the joint scientific sessions of the American College of Cardiology and the World Heart Federation. The meeting was conducted online after its cancellation because of the COVID-19 pandemic. The rate of cardiac death or MI during months 1-12 of follow-up while patients were on single-antiplatelet therapy (SAPT) with either aspirin or a P2Y12 inhibitor, usually clopidogrel, was 7.0%, compared with a prespecified performance goal of 9.7% or less, a goal set in consultation with and approval from the Food and Drug Administration based on the results from earlier, short DAPT studies in HBR patients.

“We hope these data will support our submission to the FDA for a 1-month DAPT indication for high-bleeding-risk patients treated with Resolute Onyx,” the polymer-based, zotarolimus-eluting stent tested in the study, said an officer with Medtronic, the company that sponsored this study and markets this stent, in a written statement. Currently, no stent has received a U.S. indication for just 1 month of DAPT treatment.

Mitchel L. Zoler/MDedge News

“The Onyx ONE Clear study represents the largest analysis of 1-month DAPT among commercially available DES [drug-eluting stents], and extends findings from the Onyx ONE [randomized, controlled trial] assuring the safety of a 1-month DAPT strategy among selected patients with high bleeding risk,” said David E. Kandzari, MD, director of interventional cardiology at Piedmont Healthcare in Atlanta and coprincipal investigator for the study along with Dr. Kirtane.

“Despite the patient complexity included in the study, the observation of a favorably low rate of ischemic events despite abbreviated DAPT is consistent with a theme from other contemporary studies that, among HBR patients, bleeding risk rather than ischemic risk should guide clinical decision making regarding DAPT duration,” Dr. Kandzari said in an interview.
 

Two similar trials

The Onyx ONE Clear results were consistent with findings from a study with a somewhat similar design, LEADERS FREE II, a single-arm study that assessed the safety and efficacy of BioFreedom, a polymer-free umirolimus-coated coronary stent, in HBR patients treated with DAPT for 1 month followed by SAPT.

LEADERS FREE II showed a 12-month cardiac death or MI rate of 8.6% that compared favorably with the 12.3% 1-year rate among similar patients who received bare-metal stents and a similar timing of DAPT and SAPT in a historical control group (Circ Cardiovasc Interv. 2020 Apr 13. doi: 10.1161/CIRCINTERVENTIONS.119.008603). The primary goal of LEADERS FREE II was to serve as the pivotal trial for FDA approval of the BioFreedom stent, but as of May 2020 the FDA had not approved this stent for U.S. use.

Results of another recent study, Onyx ONE, that supplied more than half the patients included in the Onyx ONE Clear analysis, showed that, in a head-to-head comparison of the Onxy and BioFreedom stents in 1,996 HBR patients treated with DAPT for 1 month followed by 11 months of SAPT, the Onyx stent was noninferior for both a primary safety outcome and a secondary efficacy outcome (N Engl J Med. 2020 Mar 26;382[13]:1208-18).

“The major differences” between the Onyx and BioFreedom stents in the patients studied in Onxy ONE Clear and in LEADERS FREE II “lie in the fact that BioFreedom is not approved in the U.S., and that Onyx is a current generation, preferred DES platform for both conventional and HBR patients,” Dr. Kirtane said in an interview.

“Because of the performance characteristics of Onyx, as well as the fact that ONYX ONE studied a far more complex group of patients than other shorter DAPT studies with conventional DES, I personally feel that there will be a preference to use this stent as a result of these data,” added Dr. Kirtane, professor of medicine at Columbia University and director of the coronary catheterization laboratory at New York–Presbyterian Hospital in New York.

The results from Onyx ONE “are critical for changing practice” among U.S. interventionalists, commented Sunil V. Rao, MD, an interventional cardiologist and professor of medicine at Duke University, Durham, N.C. Based on the new findings, U.S. operators performing percutaneous coronary interventions “will feel comfortable stopping DAPT in patients who are at high bleeding risk,” he said in an interview.

Although the results from LEADERS FREE II showed that the BioFreedom stent was superior to a bare-metal stent with 1 month of DAPT in HBR patients, and the results from Onyx ONE showed that the Onyx stent was noninferior to BioFreedom in this setting, “it’s important not to assume that there is a class effect across DES platforms. Each platform has a different drug and different stent design, so the interventional community needs to see these data for each DES,” Dr. Rao maintained.
 

Onyx ONE Clear design

Onyx ONE Clear enrolled a total of 1,506 patients, including more than 1,000 patients who received the Onyx stent in the Onyx ONE trial and an additional 752 patients enrolled in the United States and Japan, but 263 of these patients had an adverse event during their first 30 days or follow-up leaving 1,506 patients eligible to continue into the Onyx ONE Clear analysis, and with 1,491 patients followed through 12 months. Patients were an average age of 74 years, a little over two-thirds were men, 49% had a recent acute coronary syndrome event and 41% had chronic coronary syndrome. The choice of which antiplatelet agent to continue when patients transitioned to SAPT after 30 days on DAPT was left to the discretion of the physicians for each enrolled patient.

One issue these studies did not address was whether 1 month is the ideal duration for DAPT before switching to SAPT in HBR patients following coronary stenting, or whether longer DAPT durations produce even better outcomes. “It was important to establish what happens if we need to stop DAPT early.” The Onyx ONE and Onyx ONE Clear studies “provide much-needed data informing clinicians of the risks and safety of SAPT after 1 month in appropriately selected patients,” Dr. Kirtane said.

“The results do not indicate that all HBR patients should be treated with 1 month [of] DAPT, but instead demonstrate the safety and effectiveness of this strategy when clinically appropriate.” This scenario “is quite common, given that HBR patients represent up to a third” of patients undergoing percutaneous coronary intervention, Dr. Kandzari said.

Onyx ONE and Onyx ONE Clear were sponsored by Medtronic, the company that markets the Onyx coronary stent. Dr. Kirtane’s institution has received research support from Medtronic, and from Abbott Vascular, Abiomed, Boston Scientific, Cathworks, CSI, Philips, ReCor Medical, and Siemens. Dr. Kandzari has received personal fees and research grants from medtronic, personal fees from Biotronik and Cardiovascular Systems, and research grants from Biotronik, Boston Scientific, and Cardiovascular Systems. Dr. Rao has received personal fees from Medtronic, as well as from CSI and Philips.

[email protected]

SOURCE: Kirtane AJ et al. ACC 2020, Abstract 903-06.

Results from a prospective, multicenter, uncontrolled series of just over 1,500 patients with high bleeding risk who underwent coronary revascularization with a polymer-based, zotarolimus-eluting stent showed that these patients could safely receive dual-antiplatelet therapy (DAPT)for just 1 month.

This finding sets the stage for a new labeled indication for this device and management strategy in this patient population.

Results from the Onyx ONE Clear study “met its primary endpoint, with favorable rates of ischemic outcomes from 1-12 months after DAPT discontinuation within a high risk population of HBR [high-bleeding-risk] patients,” Ajay J. Kirtane, MD, said at the joint scientific sessions of the American College of Cardiology and the World Heart Federation. The meeting was conducted online after its cancellation because of the COVID-19 pandemic. The rate of cardiac death or MI during months 1-12 of follow-up while patients were on single-antiplatelet therapy (SAPT) with either aspirin or a P2Y12 inhibitor, usually clopidogrel, was 7.0%, compared with a prespecified performance goal of 9.7% or less, a goal set in consultation with and approval from the Food and Drug Administration based on the results from earlier, short DAPT studies in HBR patients.

“We hope these data will support our submission to the FDA for a 1-month DAPT indication for high-bleeding-risk patients treated with Resolute Onyx,” the polymer-based, zotarolimus-eluting stent tested in the study, said an officer with Medtronic, the company that sponsored this study and markets this stent, in a written statement. Currently, no stent has received a U.S. indication for just 1 month of DAPT treatment.

Mitchel L. Zoler/MDedge News

“The Onyx ONE Clear study represents the largest analysis of 1-month DAPT among commercially available DES [drug-eluting stents], and extends findings from the Onyx ONE [randomized, controlled trial] assuring the safety of a 1-month DAPT strategy among selected patients with high bleeding risk,” said David E. Kandzari, MD, director of interventional cardiology at Piedmont Healthcare in Atlanta and coprincipal investigator for the study along with Dr. Kirtane.

“Despite the patient complexity included in the study, the observation of a favorably low rate of ischemic events despite abbreviated DAPT is consistent with a theme from other contemporary studies that, among HBR patients, bleeding risk rather than ischemic risk should guide clinical decision making regarding DAPT duration,” Dr. Kandzari said in an interview.
 

Two similar trials

The Onyx ONE Clear results were consistent with findings from a study with a somewhat similar design, LEADERS FREE II, a single-arm study that assessed the safety and efficacy of BioFreedom, a polymer-free umirolimus-coated coronary stent, in HBR patients treated with DAPT for 1 month followed by SAPT.

LEADERS FREE II showed a 12-month cardiac death or MI rate of 8.6% that compared favorably with the 12.3% 1-year rate among similar patients who received bare-metal stents and a similar timing of DAPT and SAPT in a historical control group (Circ Cardiovasc Interv. 2020 Apr 13. doi: 10.1161/CIRCINTERVENTIONS.119.008603). The primary goal of LEADERS FREE II was to serve as the pivotal trial for FDA approval of the BioFreedom stent, but as of May 2020 the FDA had not approved this stent for U.S. use.

Results of another recent study, Onyx ONE, that supplied more than half the patients included in the Onyx ONE Clear analysis, showed that, in a head-to-head comparison of the Onxy and BioFreedom stents in 1,996 HBR patients treated with DAPT for 1 month followed by 11 months of SAPT, the Onyx stent was noninferior for both a primary safety outcome and a secondary efficacy outcome (N Engl J Med. 2020 Mar 26;382[13]:1208-18).

“The major differences” between the Onyx and BioFreedom stents in the patients studied in Onxy ONE Clear and in LEADERS FREE II “lie in the fact that BioFreedom is not approved in the U.S., and that Onyx is a current generation, preferred DES platform for both conventional and HBR patients,” Dr. Kirtane said in an interview.

“Because of the performance characteristics of Onyx, as well as the fact that ONYX ONE studied a far more complex group of patients than other shorter DAPT studies with conventional DES, I personally feel that there will be a preference to use this stent as a result of these data,” added Dr. Kirtane, professor of medicine at Columbia University and director of the coronary catheterization laboratory at New York–Presbyterian Hospital in New York.

The results from Onyx ONE “are critical for changing practice” among U.S. interventionalists, commented Sunil V. Rao, MD, an interventional cardiologist and professor of medicine at Duke University, Durham, N.C. Based on the new findings, U.S. operators performing percutaneous coronary interventions “will feel comfortable stopping DAPT in patients who are at high bleeding risk,” he said in an interview.

Although the results from LEADERS FREE II showed that the BioFreedom stent was superior to a bare-metal stent with 1 month of DAPT in HBR patients, and the results from Onyx ONE showed that the Onyx stent was noninferior to BioFreedom in this setting, “it’s important not to assume that there is a class effect across DES platforms. Each platform has a different drug and different stent design, so the interventional community needs to see these data for each DES,” Dr. Rao maintained.
 

Onyx ONE Clear design

Onyx ONE Clear enrolled a total of 1,506 patients, including more than 1,000 patients who received the Onyx stent in the Onyx ONE trial and an additional 752 patients enrolled in the United States and Japan, but 263 of these patients had an adverse event during their first 30 days or follow-up leaving 1,506 patients eligible to continue into the Onyx ONE Clear analysis, and with 1,491 patients followed through 12 months. Patients were an average age of 74 years, a little over two-thirds were men, 49% had a recent acute coronary syndrome event and 41% had chronic coronary syndrome. The choice of which antiplatelet agent to continue when patients transitioned to SAPT after 30 days on DAPT was left to the discretion of the physicians for each enrolled patient.

One issue these studies did not address was whether 1 month is the ideal duration for DAPT before switching to SAPT in HBR patients following coronary stenting, or whether longer DAPT durations produce even better outcomes. “It was important to establish what happens if we need to stop DAPT early.” The Onyx ONE and Onyx ONE Clear studies “provide much-needed data informing clinicians of the risks and safety of SAPT after 1 month in appropriately selected patients,” Dr. Kirtane said.

“The results do not indicate that all HBR patients should be treated with 1 month [of] DAPT, but instead demonstrate the safety and effectiveness of this strategy when clinically appropriate.” This scenario “is quite common, given that HBR patients represent up to a third” of patients undergoing percutaneous coronary intervention, Dr. Kandzari said.

Onyx ONE and Onyx ONE Clear were sponsored by Medtronic, the company that markets the Onyx coronary stent. Dr. Kirtane’s institution has received research support from Medtronic, and from Abbott Vascular, Abiomed, Boston Scientific, Cathworks, CSI, Philips, ReCor Medical, and Siemens. Dr. Kandzari has received personal fees and research grants from medtronic, personal fees from Biotronik and Cardiovascular Systems, and research grants from Biotronik, Boston Scientific, and Cardiovascular Systems. Dr. Rao has received personal fees from Medtronic, as well as from CSI and Philips.

[email protected]

SOURCE: Kirtane AJ et al. ACC 2020, Abstract 903-06.

The COVID-19 pandemic is putting a strain on the blood supply and could be putting people – including those who normally get transfusions, such as patients with sickle cell disease and cancer – at risk.

“Around the beginning of March, the hematology community got wind of what was going on because the blood banks were saying think about your patients and begin to restrict blood usage because we are expecting an increase in usage for COVID-positive ICU patients,” Ifeyinwa (Ify) Osunkwo, MD, a specialist in hematology and sickle cell disease at Levine Cancer Institute in Charlotte, N.C., said in an interview.

“I think that was the first call to arms around hematology ... you don’t want to shortchange somebody who is well and who is being sustained by life-giving transfusions and cut out their transfusion therapy because you are hoping to use the blood for people who are coming in with COVID-19,” she continued. “That is an ethical dilemma that no doctor wants to have to go through. But the reality is we have to do something to make it work for everybody.”

And the timing of the social restrictions due to the pandemic has added additional strain on the blood supply.

“Over the winter, traditionally, blood drives slow down because of the flu and different viruses,” she noted. “The spring and the summer are when we see the biggest recruitment and uptake of blood donation. COVID-19 hit [and] a lot of the blood drives that were traditionally scheduled to supply blood for the country have been canceled because of the new guidance for social distancing.”

Another big source of blood are health care professionals themselves and they may not be able to donate because of the extra hours being worked because of the pandemic.

In speaking about the needs for traditional patients such as those who are dealing with cancer or leukemia or sickle cell diseases as well as those who are being treated for COVID-19 in North Carolina, “we are not at the critical point, but I am a little bit nervous that we may get there because they are not going to up the usual blood drives anytime this summer. We project [sometime] in the fall, but maybe not even then. So there needs to be a significant call-out for people to make every effort to donate blood,” said Dr. Osunkwo. She added that in places such as New York City that are hot spots for the COVID-19 outbreak, the need is likely a lot greater.

She recalled a recent incident at a New York hospital that highlighted how those managing blood supplies are being restrictive and how this could be harming patients.

“A sickle cell patient came in with COVID-19 and the treatment recommendation was do a red blood cell exchange but the blood bank was nervous about getting enough blood to supply for that exchange transfusion,” she said, noting that the doctor still went to bat for that patient to get the needed treatment. “We gave her the supporting evidence that when you are on treatment for sickle cell disease, you tend to do better if you get COVID-19 or any other viral infection. The symptoms of COVID-19 in sickle cell disease is acute chest syndrome, for which the treatment is red blood cell exchange. Not doing that for [these patients] is really not giving them the optimal way of managing their disease, and managing their disease in the setting of COVID-19.”

To that end, Dr. Osunkwo stressed that doctors need to be doing all they can to get the word out that blood is needed and that the American Red Cross and other donation organizations are making it safe for people to donate. She has been using social media to highlight when her fellow doctors and others make donations as a way to motivate individuals.

“Everybody can do something during this pandemic,” she said. “Don’t feel like you are not working, that you are not a frontline worker, that you have nothing to contribute. You can donate blood. Your cousin can donate blood. You can tell your friends, your neighbors, your relatives, your enemies to go donate. We will take every kind of blood we can get because people are needing it more now. Even though we canceled elective surgeries, my patients when they get COVID-19, they need more blood ... than they usually do during their regular sickle cell admission. It is going to be the same for people who have other blood disorders like cancer and leukemia. We can’t stop life-saving treatments just because we have the COVID pandemic.”

Dr. Osunkwo also praised recent actions taken by the Food and Drug Administration to lessen some of the deferral periods for when an individual can donate.

The FDA on April 2 issued three sets of revised recommendations aimed at getting more people eligible to donate blood. All of the revised recommendations will remain in effect after the COVID-19 health emergency is declared over.

The first revised recommendation makes changes to December 2015 guidance.

For male blood donors who would have been deferred for having sex with another male partner, the deferral period has been reduced from 12 months to 3 months. That deferral period change also applies to female donors who had sex with a man who had sex with another man as well as for those with recent tattoos and piercings.

The second recommendation revises guidance from August 2013 and relates to the risk of transfusion-transmitted malaria.

Under the new recommendations, for those who traveled to malaria-endemic areas (and are residents of malaria non-endemic countries), the FDA is lowering the recommended deferral period from 12 months to 3 months, and also provides notices of an alternate procedure that permits donations without a deferral period provided the blood components are pathogen-reduced using an FDA-approved pathogen reduction device.

The third recommendation finalizes draft guidance from January that eliminates the referral period for donors who spent time in certain European countries or were on military bases in Europe and were previously considered to have been exposed to a potential risk of transmission of Creutzfeldt-Jakob Disease or Variant Creutzfeldt-Jakob Disease.

Dr. Osunkwo reports consultancy and being on the speakers bureau and participating in the advisory board for Novartis, and relationships with a variety of other pharmaceutical companies. She is the editor-in-chief for Hematology News.

[email protected]

The COVID-19 pandemic is putting a strain on the blood supply and could be putting people – including those who normally get transfusions, such as patients with sickle cell disease and cancer – at risk.

“Around the beginning of March, the hematology community got wind of what was going on because the blood banks were saying think about your patients and begin to restrict blood usage because we are expecting an increase in usage for COVID-positive ICU patients,” Ifeyinwa (Ify) Osunkwo, MD, a specialist in hematology and sickle cell disease at Levine Cancer Institute in Charlotte, N.C., said in an interview.

“I think that was the first call to arms around hematology ... you don’t want to shortchange somebody who is well and who is being sustained by life-giving transfusions and cut out their transfusion therapy because you are hoping to use the blood for people who are coming in with COVID-19,” she continued. “That is an ethical dilemma that no doctor wants to have to go through. But the reality is we have to do something to make it work for everybody.”

And the timing of the social restrictions due to the pandemic has added additional strain on the blood supply.

“Over the winter, traditionally, blood drives slow down because of the flu and different viruses,” she noted. “The spring and the summer are when we see the biggest recruitment and uptake of blood donation. COVID-19 hit [and] a lot of the blood drives that were traditionally scheduled to supply blood for the country have been canceled because of the new guidance for social distancing.”

Another big source of blood are health care professionals themselves and they may not be able to donate because of the extra hours being worked because of the pandemic.

In speaking about the needs for traditional patients such as those who are dealing with cancer or leukemia or sickle cell diseases as well as those who are being treated for COVID-19 in North Carolina, “we are not at the critical point, but I am a little bit nervous that we may get there because they are not going to up the usual blood drives anytime this summer. We project [sometime] in the fall, but maybe not even then. So there needs to be a significant call-out for people to make every effort to donate blood,” said Dr. Osunkwo. She added that in places such as New York City that are hot spots for the COVID-19 outbreak, the need is likely a lot greater.

She recalled a recent incident at a New York hospital that highlighted how those managing blood supplies are being restrictive and how this could be harming patients.

“A sickle cell patient came in with COVID-19 and the treatment recommendation was do a red blood cell exchange but the blood bank was nervous about getting enough blood to supply for that exchange transfusion,” she said, noting that the doctor still went to bat for that patient to get the needed treatment. “We gave her the supporting evidence that when you are on treatment for sickle cell disease, you tend to do better if you get COVID-19 or any other viral infection. The symptoms of COVID-19 in sickle cell disease is acute chest syndrome, for which the treatment is red blood cell exchange. Not doing that for [these patients] is really not giving them the optimal way of managing their disease, and managing their disease in the setting of COVID-19.”

To that end, Dr. Osunkwo stressed that doctors need to be doing all they can to get the word out that blood is needed and that the American Red Cross and other donation organizations are making it safe for people to donate. She has been using social media to highlight when her fellow doctors and others make donations as a way to motivate individuals.

“Everybody can do something during this pandemic,” she said. “Don’t feel like you are not working, that you are not a frontline worker, that you have nothing to contribute. You can donate blood. Your cousin can donate blood. You can tell your friends, your neighbors, your relatives, your enemies to go donate. We will take every kind of blood we can get because people are needing it more now. Even though we canceled elective surgeries, my patients when they get COVID-19, they need more blood ... than they usually do during their regular sickle cell admission. It is going to be the same for people who have other blood disorders like cancer and leukemia. We can’t stop life-saving treatments just because we have the COVID pandemic.”

Dr. Osunkwo also praised recent actions taken by the Food and Drug Administration to lessen some of the deferral periods for when an individual can donate.

The FDA on April 2 issued three sets of revised recommendations aimed at getting more people eligible to donate blood. All of the revised recommendations will remain in effect after the COVID-19 health emergency is declared over.

The first revised recommendation makes changes to December 2015 guidance.

For male blood donors who would have been deferred for having sex with another male partner, the deferral period has been reduced from 12 months to 3 months. That deferral period change also applies to female donors who had sex with a man who had sex with another man as well as for those with recent tattoos and piercings.

The second recommendation revises guidance from August 2013 and relates to the risk of transfusion-transmitted malaria.

Under the new recommendations, for those who traveled to malaria-endemic areas (and are residents of malaria non-endemic countries), the FDA is lowering the recommended deferral period from 12 months to 3 months, and also provides notices of an alternate procedure that permits donations without a deferral period provided the blood components are pathogen-reduced using an FDA-approved pathogen reduction device.

The third recommendation finalizes draft guidance from January that eliminates the referral period for donors who spent time in certain European countries or were on military bases in Europe and were previously considered to have been exposed to a potential risk of transmission of Creutzfeldt-Jakob Disease or Variant Creutzfeldt-Jakob Disease.

Dr. Osunkwo reports consultancy and being on the speakers bureau and participating in the advisory board for Novartis, and relationships with a variety of other pharmaceutical companies. She is the editor-in-chief for Hematology News.

[email protected]

The COVID-19 pandemic is putting a strain on the blood supply and could be putting people – including those who normally get transfusions, such as patients with sickle cell disease and cancer – at risk.

“Around the beginning of March, the hematology community got wind of what was going on because the blood banks were saying think about your patients and begin to restrict blood usage because we are expecting an increase in usage for COVID-positive ICU patients,” Ifeyinwa (Ify) Osunkwo, MD, a specialist in hematology and sickle cell disease at Levine Cancer Institute in Charlotte, N.C., said in an interview.

“I think that was the first call to arms around hematology ... you don’t want to shortchange somebody who is well and who is being sustained by life-giving transfusions and cut out their transfusion therapy because you are hoping to use the blood for people who are coming in with COVID-19,” she continued. “That is an ethical dilemma that no doctor wants to have to go through. But the reality is we have to do something to make it work for everybody.”

And the timing of the social restrictions due to the pandemic has added additional strain on the blood supply.

“Over the winter, traditionally, blood drives slow down because of the flu and different viruses,” she noted. “The spring and the summer are when we see the biggest recruitment and uptake of blood donation. COVID-19 hit [and] a lot of the blood drives that were traditionally scheduled to supply blood for the country have been canceled because of the new guidance for social distancing.”

Another big source of blood are health care professionals themselves and they may not be able to donate because of the extra hours being worked because of the pandemic.

In speaking about the needs for traditional patients such as those who are dealing with cancer or leukemia or sickle cell diseases as well as those who are being treated for COVID-19 in North Carolina, “we are not at the critical point, but I am a little bit nervous that we may get there because they are not going to up the usual blood drives anytime this summer. We project [sometime] in the fall, but maybe not even then. So there needs to be a significant call-out for people to make every effort to donate blood,” said Dr. Osunkwo. She added that in places such as New York City that are hot spots for the COVID-19 outbreak, the need is likely a lot greater.

She recalled a recent incident at a New York hospital that highlighted how those managing blood supplies are being restrictive and how this could be harming patients.

“A sickle cell patient came in with COVID-19 and the treatment recommendation was do a red blood cell exchange but the blood bank was nervous about getting enough blood to supply for that exchange transfusion,” she said, noting that the doctor still went to bat for that patient to get the needed treatment. “We gave her the supporting evidence that when you are on treatment for sickle cell disease, you tend to do better if you get COVID-19 or any other viral infection. The symptoms of COVID-19 in sickle cell disease is acute chest syndrome, for which the treatment is red blood cell exchange. Not doing that for [these patients] is really not giving them the optimal way of managing their disease, and managing their disease in the setting of COVID-19.”

To that end, Dr. Osunkwo stressed that doctors need to be doing all they can to get the word out that blood is needed and that the American Red Cross and other donation organizations are making it safe for people to donate. She has been using social media to highlight when her fellow doctors and others make donations as a way to motivate individuals.

“Everybody can do something during this pandemic,” she said. “Don’t feel like you are not working, that you are not a frontline worker, that you have nothing to contribute. You can donate blood. Your cousin can donate blood. You can tell your friends, your neighbors, your relatives, your enemies to go donate. We will take every kind of blood we can get because people are needing it more now. Even though we canceled elective surgeries, my patients when they get COVID-19, they need more blood ... than they usually do during their regular sickle cell admission. It is going to be the same for people who have other blood disorders like cancer and leukemia. We can’t stop life-saving treatments just because we have the COVID pandemic.”

Dr. Osunkwo also praised recent actions taken by the Food and Drug Administration to lessen some of the deferral periods for when an individual can donate.

The FDA on April 2 issued three sets of revised recommendations aimed at getting more people eligible to donate blood. All of the revised recommendations will remain in effect after the COVID-19 health emergency is declared over.

The first revised recommendation makes changes to December 2015 guidance.

For male blood donors who would have been deferred for having sex with another male partner, the deferral period has been reduced from 12 months to 3 months. That deferral period change also applies to female donors who had sex with a man who had sex with another man as well as for those with recent tattoos and piercings.

The second recommendation revises guidance from August 2013 and relates to the risk of transfusion-transmitted malaria.

Under the new recommendations, for those who traveled to malaria-endemic areas (and are residents of malaria non-endemic countries), the FDA is lowering the recommended deferral period from 12 months to 3 months, and also provides notices of an alternate procedure that permits donations without a deferral period provided the blood components are pathogen-reduced using an FDA-approved pathogen reduction device.

The third recommendation finalizes draft guidance from January that eliminates the referral period for donors who spent time in certain European countries or were on military bases in Europe and were previously considered to have been exposed to a potential risk of transmission of Creutzfeldt-Jakob Disease or Variant Creutzfeldt-Jakob Disease.

Dr. Osunkwo reports consultancy and being on the speakers bureau and participating in the advisory board for Novartis, and relationships with a variety of other pharmaceutical companies. She is the editor-in-chief for Hematology News.

[email protected]

Negative cardiovascular health indicators were found to be higher in children with hemophilia A, compared with healthy children, according to a small research study.

Thinkstock

Biochemical, imaging, and metabolic analyses were performed to compare 17 boys with severe hemophilia A to 23 healthy boys designated as controls.

The myocardial performance index (MPI) was evaluated using tissue Doppler echocardiography. In addition, peripheral and central blood pressure and arterial stiffness were assessed, as were carotid intima–media thicknesses (CIMTs), serum glucose, insulin, insulin resistance, and lipoprotein levels.

Increased MPI is considered an indicator of global deterioration in myocardial functions.

There were no differences between the two groups in terms of age and biochemical parameters, according to the researchers. There were also no significant differences found between the groups in terms of CIMT, peripheral blood pressure, and central systolic blood pressure.

However, the HDL cholesterol levels in the hemophilia group were significantly lower than those in the control group (P < .05). Five of the hemophilia patients had insulin resistance (29.4%), whereas four had low HDL cholesterol levels (23.5%).

The researchers found that the MPI values in the hemophilia group were higher than those in the control group (0.41 vs. 0.34; P = .004). In addition, left ventricle ejection time (ET), which is a predictor of mortality in heart failure and ischemic heart disease, was shorter in the hemophilia group than it was in the control group (266.6 vs. 284.4; P = .014).

As arterial stiffness increases, ejection time decreases owing to the deteriorating myocardial systolic functions, and it has also been reported in the literature that arterial stiffness affects left ventricular systolic functions, according to the authors.

“Arterial stiffness and high [central diastolic blood pressure] developing in patients with severe hemophilia A since their childhood are important risk factors for coronary artery diseases. Predisposition to dyslipidemia and [insulin resistance] noted in the hemophilia group also negatively contributes to this process. Adolescent patients with hemophilia should be monitored for hypertension, obesity, dyslipidemia, and [insulin resistance],” the authors concluded.

The study received no external funding. The authors did not report disclosures.

[email protected]

SOURCE: Özdemir ZC et al. Thrombosis Res. 2020;189:102-7.

Negative cardiovascular health indicators were found to be higher in children with hemophilia A, compared with healthy children, according to a small research study.

Thinkstock

Biochemical, imaging, and metabolic analyses were performed to compare 17 boys with severe hemophilia A to 23 healthy boys designated as controls.

The myocardial performance index (MPI) was evaluated using tissue Doppler echocardiography. In addition, peripheral and central blood pressure and arterial stiffness were assessed, as were carotid intima–media thicknesses (CIMTs), serum glucose, insulin, insulin resistance, and lipoprotein levels.

Increased MPI is considered an indicator of global deterioration in myocardial functions.

There were no differences between the two groups in terms of age and biochemical parameters, according to the researchers. There were also no significant differences found between the groups in terms of CIMT, peripheral blood pressure, and central systolic blood pressure.

However, the HDL cholesterol levels in the hemophilia group were significantly lower than those in the control group (P < .05). Five of the hemophilia patients had insulin resistance (29.4%), whereas four had low HDL cholesterol levels (23.5%).

The researchers found that the MPI values in the hemophilia group were higher than those in the control group (0.41 vs. 0.34; P = .004). In addition, left ventricle ejection time (ET), which is a predictor of mortality in heart failure and ischemic heart disease, was shorter in the hemophilia group than it was in the control group (266.6 vs. 284.4; P = .014).

As arterial stiffness increases, ejection time decreases owing to the deteriorating myocardial systolic functions, and it has also been reported in the literature that arterial stiffness affects left ventricular systolic functions, according to the authors.

“Arterial stiffness and high [central diastolic blood pressure] developing in patients with severe hemophilia A since their childhood are important risk factors for coronary artery diseases. Predisposition to dyslipidemia and [insulin resistance] noted in the hemophilia group also negatively contributes to this process. Adolescent patients with hemophilia should be monitored for hypertension, obesity, dyslipidemia, and [insulin resistance],” the authors concluded.

The study received no external funding. The authors did not report disclosures.

[email protected]

SOURCE: Özdemir ZC et al. Thrombosis Res. 2020;189:102-7.

Negative cardiovascular health indicators were found to be higher in children with hemophilia A, compared with healthy children, according to a small research study.

Thinkstock

Biochemical, imaging, and metabolic analyses were performed to compare 17 boys with severe hemophilia A to 23 healthy boys designated as controls.

The myocardial performance index (MPI) was evaluated using tissue Doppler echocardiography. In addition, peripheral and central blood pressure and arterial stiffness were assessed, as were carotid intima–media thicknesses (CIMTs), serum glucose, insulin, insulin resistance, and lipoprotein levels.

Increased MPI is considered an indicator of global deterioration in myocardial functions.

There were no differences between the two groups in terms of age and biochemical parameters, according to the researchers. There were also no significant differences found between the groups in terms of CIMT, peripheral blood pressure, and central systolic blood pressure.

However, the HDL cholesterol levels in the hemophilia group were significantly lower than those in the control group (P < .05). Five of the hemophilia patients had insulin resistance (29.4%), whereas four had low HDL cholesterol levels (23.5%).

The researchers found that the MPI values in the hemophilia group were higher than those in the control group (0.41 vs. 0.34; P = .004). In addition, left ventricle ejection time (ET), which is a predictor of mortality in heart failure and ischemic heart disease, was shorter in the hemophilia group than it was in the control group (266.6 vs. 284.4; P = .014).

As arterial stiffness increases, ejection time decreases owing to the deteriorating myocardial systolic functions, and it has also been reported in the literature that arterial stiffness affects left ventricular systolic functions, according to the authors.

“Arterial stiffness and high [central diastolic blood pressure] developing in patients with severe hemophilia A since their childhood are important risk factors for coronary artery diseases. Predisposition to dyslipidemia and [insulin resistance] noted in the hemophilia group also negatively contributes to this process. Adolescent patients with hemophilia should be monitored for hypertension, obesity, dyslipidemia, and [insulin resistance],” the authors concluded.

The study received no external funding. The authors did not report disclosures.

[email protected]

SOURCE: Özdemir ZC et al. Thrombosis Res. 2020;189:102-7.

The Food and Drug Administration has approved a new rabbit-derived recombinant analog of human coagulation factor VII (Sevenfact) for the treatment of hemophilia A or B, according to a release from the agency.

The treatment’s approval is for use in patients aged 12 years and older who’ve developed inhibitors (neutralizing antibodies). This factor VII (FVII) analog bypasses the FVIII and FIX reactions, which are no longer effective pathways for treatment in these patients because of the inhibitors they’ve developed.

According to the release, “the active ingredient of Sevenfact is a recombinant analog of human FVII, which is expressed in the mammary gland of genetically engineered rabbits and secreted into the rabbits’ milk. During purification and processing of the milk, FVII is converted into activated FVII.” The FDA’s Center for Veterinary Medicine has, after “comprehensive analysis of the scientific evidence,” determined that the process is safe for both the rabbits and handlers and that it is an effective means of producing the coagulation factor.

The approval is based on a clinical study that evaluated 27 patients with hemophilia A or B and included treatment for 465 mild to moderate events and 3 severe ones. The low (75 mcg/kg) or high (225 mcg/kg) dose was able to successfully treat 86% of the mild to moderate episodes, and all three of the severe ones were successfully treated with the high dose.

The most common side effects were headache, dizziness, infusion-site discomfort, infusion-related reaction, infusion-site hematoma, and fever. This product is contraindicated in patients with known allergies or hypersensitivities to rabbits or rabbit proteins. There is potential for increased risk of serious arterial or venous thrombotic events among patients with other risk factors for blood clots. More safety information can be found in the prescribing information, and more information about the approval can be found in the full release.

[email protected]

The Food and Drug Administration has approved a new rabbit-derived recombinant analog of human coagulation factor VII (Sevenfact) for the treatment of hemophilia A or B, according to a release from the agency.

The treatment’s approval is for use in patients aged 12 years and older who’ve developed inhibitors (neutralizing antibodies). This factor VII (FVII) analog bypasses the FVIII and FIX reactions, which are no longer effective pathways for treatment in these patients because of the inhibitors they’ve developed.

According to the release, “the active ingredient of Sevenfact is a recombinant analog of human FVII, which is expressed in the mammary gland of genetically engineered rabbits and secreted into the rabbits’ milk. During purification and processing of the milk, FVII is converted into activated FVII.” The FDA’s Center for Veterinary Medicine has, after “comprehensive analysis of the scientific evidence,” determined that the process is safe for both the rabbits and handlers and that it is an effective means of producing the coagulation factor.

The approval is based on a clinical study that evaluated 27 patients with hemophilia A or B and included treatment for 465 mild to moderate events and 3 severe ones. The low (75 mcg/kg) or high (225 mcg/kg) dose was able to successfully treat 86% of the mild to moderate episodes, and all three of the severe ones were successfully treated with the high dose.

The most common side effects were headache, dizziness, infusion-site discomfort, infusion-related reaction, infusion-site hematoma, and fever. This product is contraindicated in patients with known allergies or hypersensitivities to rabbits or rabbit proteins. There is potential for increased risk of serious arterial or venous thrombotic events among patients with other risk factors for blood clots. More safety information can be found in the prescribing information, and more information about the approval can be found in the full release.

[email protected]

The Food and Drug Administration has approved a new rabbit-derived recombinant analog of human coagulation factor VII (Sevenfact) for the treatment of hemophilia A or B, according to a release from the agency.

The treatment’s approval is for use in patients aged 12 years and older who’ve developed inhibitors (neutralizing antibodies). This factor VII (FVII) analog bypasses the FVIII and FIX reactions, which are no longer effective pathways for treatment in these patients because of the inhibitors they’ve developed.

According to the release, “the active ingredient of Sevenfact is a recombinant analog of human FVII, which is expressed in the mammary gland of genetically engineered rabbits and secreted into the rabbits’ milk. During purification and processing of the milk, FVII is converted into activated FVII.” The FDA’s Center for Veterinary Medicine has, after “comprehensive analysis of the scientific evidence,” determined that the process is safe for both the rabbits and handlers and that it is an effective means of producing the coagulation factor.

The approval is based on a clinical study that evaluated 27 patients with hemophilia A or B and included treatment for 465 mild to moderate events and 3 severe ones. The low (75 mcg/kg) or high (225 mcg/kg) dose was able to successfully treat 86% of the mild to moderate episodes, and all three of the severe ones were successfully treated with the high dose.

The most common side effects were headache, dizziness, infusion-site discomfort, infusion-related reaction, infusion-site hematoma, and fever. This product is contraindicated in patients with known allergies or hypersensitivities to rabbits or rabbit proteins. There is potential for increased risk of serious arterial or venous thrombotic events among patients with other risk factors for blood clots. More safety information can be found in the prescribing information, and more information about the approval can be found in the full release.

[email protected]

First-in-human results suggest a gene therapy, BAY 2599023, can increase factor VIII levels in patients with hemophilia A, but it isn’t clear if BAY 2599023 can eliminate the need for prophylaxis.

©designer491/Thinkstock

Of four patients who received BAY 2599023, three achieved clinically meaningful factor VIII levels, and all were able to stop prophylaxis at some point. However, one patient had to resume prophylaxis, and all four have experienced bleeds since receiving BAY 2599023.

This is a dose-escalating trial (NCT03588299), so researchers are still attempting to determine the optimal dose of BAY 2599023. Upcoming results in two patients treated at the highest dose should provide more insight, according to Steven W. Pipe, MD, of the University of Michigan in Ann Arbor.

Dr. Pipe presented results with BAY 2599023 at the annual congress of the European Association for Haemophilia and Allied Disorders.

He noted that between 30% and 70% of hemophilia patients may have preexisting neutralizing antibodies to specific adeno-associated virus (AAV) serotypes. Developing gene therapies with varying serotypes could reduce this problem and increase eligibility for gene therapy. Bayer had this in mind when developing BAY 2599023.

BAY 2599023 is a non-replicating AAV vector, based on the AAV serotype hu37, which contains a single-stranded DNA genome encoding a B-domain deleted factor VIII, under the control of a liver-specific promotor/enhancer combination optimized for transgenic expression, Dr. Pipe explained.

He presented results with BAY 2599023 in four patients with severe hemophilia A. At baseline, patients were receiving prophylaxis and did not have factor VIII inhibitors or detectable immunity to the AAVhu37 capsid.
 

First cohort

Two patients received BAY 2599023 at a dose of 0.5 × 10¹³ GC/kg. One patient achieved a factor VIII level above 5% at this dose and was able to stop prophylaxis temporarily. The patient experienced two bleeds on study and had to resume prophylaxis because of a target joint.

“He came into the study with a particularly challenging target joint in his ankle, and he had known from experience on prophylaxis that, if his factor level got too low, he would have breakthrough bleeds,” Dr. Pipe explained. “So we agreed that if he didn’t achieve a sustained level above 5%, he would go back on prophylaxis. He was able to stay off prophylaxis for 6 weeks, but we had to put him back on because of breakthrough bleeding.”

Dr. Pipe and colleagues have been following this patient for about a year, and the patient still has factor VIII levels of about 2% to 3% after a washout of prophylaxis.

The other patient who received a dose of 0.5 × 10¹³ GC/kg came off prophylaxis early on and has sustained factor VIII levels of 20%. This patient had four bleeds early in the trial but has since done very well, Dr. Pipe said. The patient had 99 bleeds in the year prior to receiving BAY 2599023.
 

Second cohort

Two subsequent patients received BAY 2599023 at a dose of 1 × 10¹³ GC/kg. Both patients have stopped prophylaxis.

One patient achieved factor VIII levels in the 5%-10% range and stopped prophylaxis at day 49. The patient has received on-demand treatment for four bleeds. The other patient achieved “robust” factor VIII expression levels “well above 20%,” according to Dr. Pipe. This patient stopped prophylaxis at day 10 and experienced bleeds early on but has remained bleed-free and treatment-free for 7 months.

Dr. Pipe noted that this patient experienced a spike in transaminases “very early on” after receiving BAY 2599023.

“So he was put on prednisone, but his liver enzymes almost immediately corrected to within the normal range,” Dr. Pipe said. “He has finished the cascading dose of prednisone, his liver enzymes have remained stable, his factor VIII expression has remained stable, and he continues to do very well.”
 

Next steps

Based on results in the first two cohorts, researchers are proceeding with a higher dose of BAY 2599023.

“The overall goal of this study is to identify the optimal dose that can be taken forward to the planned phase 3 study,” Dr. Pipe said. “What they [Bayer] would like to bring to the community is a product that offers a chance for maximum eligibility based on low screen out because of preexisting immunity and maximize the number of patients who are in the normal range.”

“For patients to embrace gene therapy, it really has to get them at least the possibility to land within the normal range and, hopefully, be not just liberated from prophylaxis but maybe liberated from the need for factor VIII at all,” Dr. Pipe added. “I think if these AAV platform therapies can’t deliver that on a relatively consistent basis, it’s going to be challenging to get patients to embrace this technology.”

The phase 1/2 trial is sponsored by Bayer in collaboration with Ultragenyx Pharmaceutical Inc. Dr. Pipe disclosed relationships with Bayer and other companies.

[email protected]

SOURCE: Pipe SW et al. EAHAD 2020. Abstract P190.

First-in-human results suggest a gene therapy, BAY 2599023, can increase factor VIII levels in patients with hemophilia A, but it isn’t clear if BAY 2599023 can eliminate the need for prophylaxis.

©designer491/Thinkstock

Of four patients who received BAY 2599023, three achieved clinically meaningful factor VIII levels, and all were able to stop prophylaxis at some point. However, one patient had to resume prophylaxis, and all four have experienced bleeds since receiving BAY 2599023.

This is a dose-escalating trial (NCT03588299), so researchers are still attempting to determine the optimal dose of BAY 2599023. Upcoming results in two patients treated at the highest dose should provide more insight, according to Steven W. Pipe, MD, of the University of Michigan in Ann Arbor.

Dr. Pipe presented results with BAY 2599023 at the annual congress of the European Association for Haemophilia and Allied Disorders.

He noted that between 30% and 70% of hemophilia patients may have preexisting neutralizing antibodies to specific adeno-associated virus (AAV) serotypes. Developing gene therapies with varying serotypes could reduce this problem and increase eligibility for gene therapy. Bayer had this in mind when developing BAY 2599023.

BAY 2599023 is a non-replicating AAV vector, based on the AAV serotype hu37, which contains a single-stranded DNA genome encoding a B-domain deleted factor VIII, under the control of a liver-specific promotor/enhancer combination optimized for transgenic expression, Dr. Pipe explained.

He presented results with BAY 2599023 in four patients with severe hemophilia A. At baseline, patients were receiving prophylaxis and did not have factor VIII inhibitors or detectable immunity to the AAVhu37 capsid.
 

First cohort

Two patients received BAY 2599023 at a dose of 0.5 × 10¹³ GC/kg. One patient achieved a factor VIII level above 5% at this dose and was able to stop prophylaxis temporarily. The patient experienced two bleeds on study and had to resume prophylaxis because of a target joint.

“He came into the study with a particularly challenging target joint in his ankle, and he had known from experience on prophylaxis that, if his factor level got too low, he would have breakthrough bleeds,” Dr. Pipe explained. “So we agreed that if he didn’t achieve a sustained level above 5%, he would go back on prophylaxis. He was able to stay off prophylaxis for 6 weeks, but we had to put him back on because of breakthrough bleeding.”

Dr. Pipe and colleagues have been following this patient for about a year, and the patient still has factor VIII levels of about 2% to 3% after a washout of prophylaxis.

The other patient who received a dose of 0.5 × 10¹³ GC/kg came off prophylaxis early on and has sustained factor VIII levels of 20%. This patient had four bleeds early in the trial but has since done very well, Dr. Pipe said. The patient had 99 bleeds in the year prior to receiving BAY 2599023.
 

Second cohort

Two subsequent patients received BAY 2599023 at a dose of 1 × 10¹³ GC/kg. Both patients have stopped prophylaxis.

One patient achieved factor VIII levels in the 5%-10% range and stopped prophylaxis at day 49. The patient has received on-demand treatment for four bleeds. The other patient achieved “robust” factor VIII expression levels “well above 20%,” according to Dr. Pipe. This patient stopped prophylaxis at day 10 and experienced bleeds early on but has remained bleed-free and treatment-free for 7 months.

Dr. Pipe noted that this patient experienced a spike in transaminases “very early on” after receiving BAY 2599023.

“So he was put on prednisone, but his liver enzymes almost immediately corrected to within the normal range,” Dr. Pipe said. “He has finished the cascading dose of prednisone, his liver enzymes have remained stable, his factor VIII expression has remained stable, and he continues to do very well.”
 

Next steps

Based on results in the first two cohorts, researchers are proceeding with a higher dose of BAY 2599023.

“The overall goal of this study is to identify the optimal dose that can be taken forward to the planned phase 3 study,” Dr. Pipe said. “What they [Bayer] would like to bring to the community is a product that offers a chance for maximum eligibility based on low screen out because of preexisting immunity and maximize the number of patients who are in the normal range.”

“For patients to embrace gene therapy, it really has to get them at least the possibility to land within the normal range and, hopefully, be not just liberated from prophylaxis but maybe liberated from the need for factor VIII at all,” Dr. Pipe added. “I think if these AAV platform therapies can’t deliver that on a relatively consistent basis, it’s going to be challenging to get patients to embrace this technology.”

The phase 1/2 trial is sponsored by Bayer in collaboration with Ultragenyx Pharmaceutical Inc. Dr. Pipe disclosed relationships with Bayer and other companies.

[email protected]

SOURCE: Pipe SW et al. EAHAD 2020. Abstract P190.

First-in-human results suggest a gene therapy, BAY 2599023, can increase factor VIII levels in patients with hemophilia A, but it isn’t clear if BAY 2599023 can eliminate the need for prophylaxis.

©designer491/Thinkstock

Of four patients who received BAY 2599023, three achieved clinically meaningful factor VIII levels, and all were able to stop prophylaxis at some point. However, one patient had to resume prophylaxis, and all four have experienced bleeds since receiving BAY 2599023.

This is a dose-escalating trial (NCT03588299), so researchers are still attempting to determine the optimal dose of BAY 2599023. Upcoming results in two patients treated at the highest dose should provide more insight, according to Steven W. Pipe, MD, of the University of Michigan in Ann Arbor.

Dr. Pipe presented results with BAY 2599023 at the annual congress of the European Association for Haemophilia and Allied Disorders.

He noted that between 30% and 70% of hemophilia patients may have preexisting neutralizing antibodies to specific adeno-associated virus (AAV) serotypes. Developing gene therapies with varying serotypes could reduce this problem and increase eligibility for gene therapy. Bayer had this in mind when developing BAY 2599023.

BAY 2599023 is a non-replicating AAV vector, based on the AAV serotype hu37, which contains a single-stranded DNA genome encoding a B-domain deleted factor VIII, under the control of a liver-specific promotor/enhancer combination optimized for transgenic expression, Dr. Pipe explained.

He presented results with BAY 2599023 in four patients with severe hemophilia A. At baseline, patients were receiving prophylaxis and did not have factor VIII inhibitors or detectable immunity to the AAVhu37 capsid.
 

First cohort

Two patients received BAY 2599023 at a dose of 0.5 × 10¹³ GC/kg. One patient achieved a factor VIII level above 5% at this dose and was able to stop prophylaxis temporarily. The patient experienced two bleeds on study and had to resume prophylaxis because of a target joint.

“He came into the study with a particularly challenging target joint in his ankle, and he had known from experience on prophylaxis that, if his factor level got too low, he would have breakthrough bleeds,” Dr. Pipe explained. “So we agreed that if he didn’t achieve a sustained level above 5%, he would go back on prophylaxis. He was able to stay off prophylaxis for 6 weeks, but we had to put him back on because of breakthrough bleeding.”

Dr. Pipe and colleagues have been following this patient for about a year, and the patient still has factor VIII levels of about 2% to 3% after a washout of prophylaxis.

The other patient who received a dose of 0.5 × 10¹³ GC/kg came off prophylaxis early on and has sustained factor VIII levels of 20%. This patient had four bleeds early in the trial but has since done very well, Dr. Pipe said. The patient had 99 bleeds in the year prior to receiving BAY 2599023.
 

Second cohort

Two subsequent patients received BAY 2599023 at a dose of 1 × 10¹³ GC/kg. Both patients have stopped prophylaxis.

One patient achieved factor VIII levels in the 5%-10% range and stopped prophylaxis at day 49. The patient has received on-demand treatment for four bleeds. The other patient achieved “robust” factor VIII expression levels “well above 20%,” according to Dr. Pipe. This patient stopped prophylaxis at day 10 and experienced bleeds early on but has remained bleed-free and treatment-free for 7 months.

Dr. Pipe noted that this patient experienced a spike in transaminases “very early on” after receiving BAY 2599023.

“So he was put on prednisone, but his liver enzymes almost immediately corrected to within the normal range,” Dr. Pipe said. “He has finished the cascading dose of prednisone, his liver enzymes have remained stable, his factor VIII expression has remained stable, and he continues to do very well.”
 

Next steps

Based on results in the first two cohorts, researchers are proceeding with a higher dose of BAY 2599023.

“The overall goal of this study is to identify the optimal dose that can be taken forward to the planned phase 3 study,” Dr. Pipe said. “What they [Bayer] would like to bring to the community is a product that offers a chance for maximum eligibility based on low screen out because of preexisting immunity and maximize the number of patients who are in the normal range.”

“For patients to embrace gene therapy, it really has to get them at least the possibility to land within the normal range and, hopefully, be not just liberated from prophylaxis but maybe liberated from the need for factor VIII at all,” Dr. Pipe added. “I think if these AAV platform therapies can’t deliver that on a relatively consistent basis, it’s going to be challenging to get patients to embrace this technology.”

The phase 1/2 trial is sponsored by Bayer in collaboration with Ultragenyx Pharmaceutical Inc. Dr. Pipe disclosed relationships with Bayer and other companies.

[email protected]

SOURCE: Pipe SW et al. EAHAD 2020. Abstract P190.

The gene therapy etranacogene dezaparvovec (AMT-061) continues to demonstrate safety and efficacy in patients with hemophilia B, according to a 1-year update of a phase 2b trial.

All three patients in this trial experienced sustained increases in factor IX (FIX) activity and were able to stop prophylaxis without suffering any bleeds. Adverse events related to treatment were mild and transient.

These favorable results are particularly noteworthy because all three patients had anti-AAV5 neutralizing antibodies at baseline, according to Steven W. Pipe, MD, of the University of Michigan, Ann Arbor. He noted that studies of etranacogene dezaparvovec and its predecessor, AMT-060, are the only studies that have not excluded hemophilia patients based on preexisting immunity.

Dr. Pipe presented the latest phase 2b results with etranacogene dezaparvovec at the annual congress of the European Association for Haemophilia and Allied Disorders.

Etranacogene dezaparvovec uses an AAV5 serotype with a transgene expression cassette that codes for the hyperactive Padua FIX variant, Dr. Pipe explained. Etranacogene dezaparvovec has a structure that is nearly identical to that of AMT-060, except for two nucleotide substitutions in the coding sequence for FIX.

AMT-060 enabled stable expression of FIX that has persisted for up to 4 years without any late-emergent safety signals (Blood 2019. 134 Supplement 1: 2059). Dr. Pipe said the “enhanced version” of AMT-060, etranacogene dezaparvovec, has produced even higher levels of FIX activity in the phase 2b study (NCT03489291).

The ongoing study enrolled three men with moderate to severe FIX deficiency at baseline. The patients were 43, 50, and 47 years of age, respectively. Two patients are HIV positive, and all had hepatitis C that resolved.

All three patients were receiving FIX prophylaxis and on-demand treatment at baseline. In the year prior to screening, patients had one, three, and five bleeds, respectively. All three patients had anti-AAV5 neutralizing antibodies.

Efficacy

Patients received a single dose of etranacogene dezaparvovec at 2 x 10¹³ genome copies/kg. All three patients achieved the primary endpoint, which was FIX activity of at least 5% at 6 weeks.

At 52 weeks, the mean FIX activity was 41%. Patients 1 and 3 have maintained FIX activity of 40% or greater, which is in the nonhemophilic range. Patient 2 has maintained FIX activity in the mild range. At 52 weeks, FIX activity levels were 50.2%, 40.8%, and 31.3%, respectively.

All patients remain free of prophylaxis and bleeds. Patient 3 received a single FIX infusion as a precaution in the perioperative setting. There was no evidence of a bleed in this patient.
 

Safety

Etranacogene dezaparvovec was generally well tolerated, Dr. Pipe said. One patient had two adverse events that were possibly related to etranacogene dezaparvovec. Both events – transient, self-limiting headache and slightly elevated C-reactive protein – resolved without intervention.

There was one serious adverse event, but it was considered unrelated to treatment. Patient 3 required hip surgery for preexisting avascular necrosis.

Dr. Pipe said there was no evidence of transaminitis. There were modest, transient elevations in liver enzymes, but this was not enough to trigger protocol-specified immunosuppression.

Specifically, one patient had ALT elevations at weeks 22 and 44, and one patient had AST elevations at weeks 2, 4, and 31. All of these resolved quickly without treatment or an impact on FIX activity, Dr. Pipe noted.
 

Next steps

This study is ongoing, and patients will be followed for 5 years. Dr. Pipe said the main focus of follow-up will be to determine if patients maintain durable expression of FIX.

A phase 3 trial of etranacogene dezaparvovec is ongoing as well. The trial, HOPE-B (NCT03569891), is fully enrolled, and dosing is planned for 55 patients.

“We’re looking forward to data analysis later this year,” Dr. Pipe said. “This will be the only phase 3 study, and really the only platform so far, that is not planning to exclude patients based on preexisting immunity.”

If all goes well in the phase 3 study, etranacogene dezaparvovec could be approved by the Food and Drug Administration very soon, Dr. Pipe added.

UniQure, the company developing etranacogene dezaparvovec, is planning to submit the biologics license application to the FDA next year. Etranacogene dezaparvovec was granted breakthrough designation from the FDA and is therefore eligible for priority review, so the gene therapy could be approved as early as 2021.

The phase 2b trial of etranacogene dezaparvovec is sponsored by uniQure. Dr. Pipe disclosed relationships with uniQure and other companies.

[email protected]

SOURCE: Pipe SW et al. EAHAD 2020, Abstract OR10.

The gene therapy etranacogene dezaparvovec (AMT-061) continues to demonstrate safety and efficacy in patients with hemophilia B, according to a 1-year update of a phase 2b trial.

All three patients in this trial experienced sustained increases in factor IX (FIX) activity and were able to stop prophylaxis without suffering any bleeds. Adverse events related to treatment were mild and transient.

These favorable results are particularly noteworthy because all three patients had anti-AAV5 neutralizing antibodies at baseline, according to Steven W. Pipe, MD, of the University of Michigan, Ann Arbor. He noted that studies of etranacogene dezaparvovec and its predecessor, AMT-060, are the only studies that have not excluded hemophilia patients based on preexisting immunity.

Dr. Pipe presented the latest phase 2b results with etranacogene dezaparvovec at the annual congress of the European Association for Haemophilia and Allied Disorders.

Etranacogene dezaparvovec uses an AAV5 serotype with a transgene expression cassette that codes for the hyperactive Padua FIX variant, Dr. Pipe explained. Etranacogene dezaparvovec has a structure that is nearly identical to that of AMT-060, except for two nucleotide substitutions in the coding sequence for FIX.

AMT-060 enabled stable expression of FIX that has persisted for up to 4 years without any late-emergent safety signals (Blood 2019. 134 Supplement 1: 2059). Dr. Pipe said the “enhanced version” of AMT-060, etranacogene dezaparvovec, has produced even higher levels of FIX activity in the phase 2b study (NCT03489291).

The ongoing study enrolled three men with moderate to severe FIX deficiency at baseline. The patients were 43, 50, and 47 years of age, respectively. Two patients are HIV positive, and all had hepatitis C that resolved.

All three patients were receiving FIX prophylaxis and on-demand treatment at baseline. In the year prior to screening, patients had one, three, and five bleeds, respectively. All three patients had anti-AAV5 neutralizing antibodies.

Efficacy

Patients received a single dose of etranacogene dezaparvovec at 2 x 10¹³ genome copies/kg. All three patients achieved the primary endpoint, which was FIX activity of at least 5% at 6 weeks.

At 52 weeks, the mean FIX activity was 41%. Patients 1 and 3 have maintained FIX activity of 40% or greater, which is in the nonhemophilic range. Patient 2 has maintained FIX activity in the mild range. At 52 weeks, FIX activity levels were 50.2%, 40.8%, and 31.3%, respectively.

All patients remain free of prophylaxis and bleeds. Patient 3 received a single FIX infusion as a precaution in the perioperative setting. There was no evidence of a bleed in this patient.
 

Safety

Etranacogene dezaparvovec was generally well tolerated, Dr. Pipe said. One patient had two adverse events that were possibly related to etranacogene dezaparvovec. Both events – transient, self-limiting headache and slightly elevated C-reactive protein – resolved without intervention.

There was one serious adverse event, but it was considered unrelated to treatment. Patient 3 required hip surgery for preexisting avascular necrosis.

Dr. Pipe said there was no evidence of transaminitis. There were modest, transient elevations in liver enzymes, but this was not enough to trigger protocol-specified immunosuppression.

Specifically, one patient had ALT elevations at weeks 22 and 44, and one patient had AST elevations at weeks 2, 4, and 31. All of these resolved quickly without treatment or an impact on FIX activity, Dr. Pipe noted.
 

Next steps

This study is ongoing, and patients will be followed for 5 years. Dr. Pipe said the main focus of follow-up will be to determine if patients maintain durable expression of FIX.

A phase 3 trial of etranacogene dezaparvovec is ongoing as well. The trial, HOPE-B (NCT03569891), is fully enrolled, and dosing is planned for 55 patients.

“We’re looking forward to data analysis later this year,” Dr. Pipe said. “This will be the only phase 3 study, and really the only platform so far, that is not planning to exclude patients based on preexisting immunity.”

If all goes well in the phase 3 study, etranacogene dezaparvovec could be approved by the Food and Drug Administration very soon, Dr. Pipe added.

UniQure, the company developing etranacogene dezaparvovec, is planning to submit the biologics license application to the FDA next year. Etranacogene dezaparvovec was granted breakthrough designation from the FDA and is therefore eligible for priority review, so the gene therapy could be approved as early as 2021.

The phase 2b trial of etranacogene dezaparvovec is sponsored by uniQure. Dr. Pipe disclosed relationships with uniQure and other companies.

[email protected]

SOURCE: Pipe SW et al. EAHAD 2020, Abstract OR10.

The gene therapy etranacogene dezaparvovec (AMT-061) continues to demonstrate safety and efficacy in patients with hemophilia B, according to a 1-year update of a phase 2b trial.

All three patients in this trial experienced sustained increases in factor IX (FIX) activity and were able to stop prophylaxis without suffering any bleeds. Adverse events related to treatment were mild and transient.

These favorable results are particularly noteworthy because all three patients had anti-AAV5 neutralizing antibodies at baseline, according to Steven W. Pipe, MD, of the University of Michigan, Ann Arbor. He noted that studies of etranacogene dezaparvovec and its predecessor, AMT-060, are the only studies that have not excluded hemophilia patients based on preexisting immunity.

Dr. Pipe presented the latest phase 2b results with etranacogene dezaparvovec at the annual congress of the European Association for Haemophilia and Allied Disorders.

Etranacogene dezaparvovec uses an AAV5 serotype with a transgene expression cassette that codes for the hyperactive Padua FIX variant, Dr. Pipe explained. Etranacogene dezaparvovec has a structure that is nearly identical to that of AMT-060, except for two nucleotide substitutions in the coding sequence for FIX.

AMT-060 enabled stable expression of FIX that has persisted for up to 4 years without any late-emergent safety signals (Blood 2019. 134 Supplement 1: 2059). Dr. Pipe said the “enhanced version” of AMT-060, etranacogene dezaparvovec, has produced even higher levels of FIX activity in the phase 2b study (NCT03489291).

The ongoing study enrolled three men with moderate to severe FIX deficiency at baseline. The patients were 43, 50, and 47 years of age, respectively. Two patients are HIV positive, and all had hepatitis C that resolved.

All three patients were receiving FIX prophylaxis and on-demand treatment at baseline. In the year prior to screening, patients had one, three, and five bleeds, respectively. All three patients had anti-AAV5 neutralizing antibodies.

Efficacy

Patients received a single dose of etranacogene dezaparvovec at 2 x 10¹³ genome copies/kg. All three patients achieved the primary endpoint, which was FIX activity of at least 5% at 6 weeks.

At 52 weeks, the mean FIX activity was 41%. Patients 1 and 3 have maintained FIX activity of 40% or greater, which is in the nonhemophilic range. Patient 2 has maintained FIX activity in the mild range. At 52 weeks, FIX activity levels were 50.2%, 40.8%, and 31.3%, respectively.

All patients remain free of prophylaxis and bleeds. Patient 3 received a single FIX infusion as a precaution in the perioperative setting. There was no evidence of a bleed in this patient.
 

Safety

Etranacogene dezaparvovec was generally well tolerated, Dr. Pipe said. One patient had two adverse events that were possibly related to etranacogene dezaparvovec. Both events – transient, self-limiting headache and slightly elevated C-reactive protein – resolved without intervention.

There was one serious adverse event, but it was considered unrelated to treatment. Patient 3 required hip surgery for preexisting avascular necrosis.

Dr. Pipe said there was no evidence of transaminitis. There were modest, transient elevations in liver enzymes, but this was not enough to trigger protocol-specified immunosuppression.

Specifically, one patient had ALT elevations at weeks 22 and 44, and one patient had AST elevations at weeks 2, 4, and 31. All of these resolved quickly without treatment or an impact on FIX activity, Dr. Pipe noted.
 

Next steps

This study is ongoing, and patients will be followed for 5 years. Dr. Pipe said the main focus of follow-up will be to determine if patients maintain durable expression of FIX.

A phase 3 trial of etranacogene dezaparvovec is ongoing as well. The trial, HOPE-B (NCT03569891), is fully enrolled, and dosing is planned for 55 patients.

“We’re looking forward to data analysis later this year,” Dr. Pipe said. “This will be the only phase 3 study, and really the only platform so far, that is not planning to exclude patients based on preexisting immunity.”

If all goes well in the phase 3 study, etranacogene dezaparvovec could be approved by the Food and Drug Administration very soon, Dr. Pipe added.

UniQure, the company developing etranacogene dezaparvovec, is planning to submit the biologics license application to the FDA next year. Etranacogene dezaparvovec was granted breakthrough designation from the FDA and is therefore eligible for priority review, so the gene therapy could be approved as early as 2021.

The phase 2b trial of etranacogene dezaparvovec is sponsored by uniQure. Dr. Pipe disclosed relationships with uniQure and other companies.

[email protected]

SOURCE: Pipe SW et al. EAHAD 2020, Abstract OR10.