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Replacement factors, bypassing agents safely manage fitusiran bleed events
Fitusiran appears to promote hemostasis and reduce the frequency of bleeding in patients with hemophilia. In a phase I trial of the investigational agent, breakthrough bleeds were treated effectively and safely with replacement factor or bypassing agent.
Bleed events were rare among patients achieving target antithrombin lowering of greater than 75% on fitusiran. Those that did occur were treated with factor concentrates, including recombinant Factor VIII or recombinant Factor IX, or with bypassing agents, including recombinant Factor VIIa or activated prothrombin complex–concentrates, Savita Rangarajan, MD, reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.
The study included 41 patients with hemophilia A or B – 25 patients with inhibitors and 16 without inhibitors – who received either 50 mg or 80 mg of fitusiran. Early multiple ascending dose–cohorts received weekly subcutaneous dosing, and later cohorts received monthly dosing. All patients tolerated treatment well, with no serious adverse events related to the study drug. No thromboembolic events occurred, and the majority of adverse events were mild or moderate in severity, she noted.
Among patients with inhibitors, eight bleeds occurred in five patients with hemophilia A who were treated with Factor VIII, and three bleeds occurred in two patients with hemophilia B who were treated with Factor IX. Among those without inhibitors, six bleeds occurred in three patients treated with activated prothrombin complex–concentrates, and four occurred in three patients treated with recombinant Factor VIIa, said Dr. Rangarajan of Hampshire Hospitals NHS Foundation Trust, Basingstoke, England.
The ranges of factor replacement used per injection were 7-32 IU/kg of Factor VIII and 7-43 IU/kg of Factor IX.
The ranges of bypassing agents used per injection were 14-75 U/kg of activated prothrombin complex–concentrates (mean, 2.2 administrations per bleed) and 93-133 μg/kg of recombinant Factor VIIa (mean, 1.5 administrations per bleed), she said.
Doses of the factor concentrates and bypassing agents used were at or below those recommended by the World Federation of Hemophilia.
This phase I study of fitusiran, which targets and lowers antithrombin to improve thrombin generation and promote hemostasis in patients with hemophilia, is being conducted in four parts: Part A with healthy volunteers, parts B and C with patients with moderate to severe hemophilia A or B, and part D with patients with hemophilia A or B with inhibitors.
Findings from the current exploratory analysis of the data are encouraging as they demonstrate good treatment effect in the absence of identified safety concerns, Dr. Rangarajan said, noting that fitusiran should advance to pivotal studies in 2017 and that data on bleed management from a phase I and phase II open label extension will guide protocol on bleed management in phase III.
Dr. Rangarajan has received grant or research support from Alnylam Pharmaceuticals, BioMarin Pharmaceutical, Novo Nordisk, Pfizer, and Shire.
Fitusiran appears to promote hemostasis and reduce the frequency of bleeding in patients with hemophilia. In a phase I trial of the investigational agent, breakthrough bleeds were treated effectively and safely with replacement factor or bypassing agent.
Bleed events were rare among patients achieving target antithrombin lowering of greater than 75% on fitusiran. Those that did occur were treated with factor concentrates, including recombinant Factor VIII or recombinant Factor IX, or with bypassing agents, including recombinant Factor VIIa or activated prothrombin complex–concentrates, Savita Rangarajan, MD, reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.
The study included 41 patients with hemophilia A or B – 25 patients with inhibitors and 16 without inhibitors – who received either 50 mg or 80 mg of fitusiran. Early multiple ascending dose–cohorts received weekly subcutaneous dosing, and later cohorts received monthly dosing. All patients tolerated treatment well, with no serious adverse events related to the study drug. No thromboembolic events occurred, and the majority of adverse events were mild or moderate in severity, she noted.
Among patients with inhibitors, eight bleeds occurred in five patients with hemophilia A who were treated with Factor VIII, and three bleeds occurred in two patients with hemophilia B who were treated with Factor IX. Among those without inhibitors, six bleeds occurred in three patients treated with activated prothrombin complex–concentrates, and four occurred in three patients treated with recombinant Factor VIIa, said Dr. Rangarajan of Hampshire Hospitals NHS Foundation Trust, Basingstoke, England.
The ranges of factor replacement used per injection were 7-32 IU/kg of Factor VIII and 7-43 IU/kg of Factor IX.
The ranges of bypassing agents used per injection were 14-75 U/kg of activated prothrombin complex–concentrates (mean, 2.2 administrations per bleed) and 93-133 μg/kg of recombinant Factor VIIa (mean, 1.5 administrations per bleed), she said.
Doses of the factor concentrates and bypassing agents used were at or below those recommended by the World Federation of Hemophilia.
This phase I study of fitusiran, which targets and lowers antithrombin to improve thrombin generation and promote hemostasis in patients with hemophilia, is being conducted in four parts: Part A with healthy volunteers, parts B and C with patients with moderate to severe hemophilia A or B, and part D with patients with hemophilia A or B with inhibitors.
Findings from the current exploratory analysis of the data are encouraging as they demonstrate good treatment effect in the absence of identified safety concerns, Dr. Rangarajan said, noting that fitusiran should advance to pivotal studies in 2017 and that data on bleed management from a phase I and phase II open label extension will guide protocol on bleed management in phase III.
Dr. Rangarajan has received grant or research support from Alnylam Pharmaceuticals, BioMarin Pharmaceutical, Novo Nordisk, Pfizer, and Shire.
Fitusiran appears to promote hemostasis and reduce the frequency of bleeding in patients with hemophilia. In a phase I trial of the investigational agent, breakthrough bleeds were treated effectively and safely with replacement factor or bypassing agent.
Bleed events were rare among patients achieving target antithrombin lowering of greater than 75% on fitusiran. Those that did occur were treated with factor concentrates, including recombinant Factor VIII or recombinant Factor IX, or with bypassing agents, including recombinant Factor VIIa or activated prothrombin complex–concentrates, Savita Rangarajan, MD, reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.
The study included 41 patients with hemophilia A or B – 25 patients with inhibitors and 16 without inhibitors – who received either 50 mg or 80 mg of fitusiran. Early multiple ascending dose–cohorts received weekly subcutaneous dosing, and later cohorts received monthly dosing. All patients tolerated treatment well, with no serious adverse events related to the study drug. No thromboembolic events occurred, and the majority of adverse events were mild or moderate in severity, she noted.
Among patients with inhibitors, eight bleeds occurred in five patients with hemophilia A who were treated with Factor VIII, and three bleeds occurred in two patients with hemophilia B who were treated with Factor IX. Among those without inhibitors, six bleeds occurred in three patients treated with activated prothrombin complex–concentrates, and four occurred in three patients treated with recombinant Factor VIIa, said Dr. Rangarajan of Hampshire Hospitals NHS Foundation Trust, Basingstoke, England.
The ranges of factor replacement used per injection were 7-32 IU/kg of Factor VIII and 7-43 IU/kg of Factor IX.
The ranges of bypassing agents used per injection were 14-75 U/kg of activated prothrombin complex–concentrates (mean, 2.2 administrations per bleed) and 93-133 μg/kg of recombinant Factor VIIa (mean, 1.5 administrations per bleed), she said.
Doses of the factor concentrates and bypassing agents used were at or below those recommended by the World Federation of Hemophilia.
This phase I study of fitusiran, which targets and lowers antithrombin to improve thrombin generation and promote hemostasis in patients with hemophilia, is being conducted in four parts: Part A with healthy volunteers, parts B and C with patients with moderate to severe hemophilia A or B, and part D with patients with hemophilia A or B with inhibitors.
Findings from the current exploratory analysis of the data are encouraging as they demonstrate good treatment effect in the absence of identified safety concerns, Dr. Rangarajan said, noting that fitusiran should advance to pivotal studies in 2017 and that data on bleed management from a phase I and phase II open label extension will guide protocol on bleed management in phase III.
Dr. Rangarajan has received grant or research support from Alnylam Pharmaceuticals, BioMarin Pharmaceutical, Novo Nordisk, Pfizer, and Shire.
Key clinical point:
Major finding: 21 bleeds occurred in 13 patients, and all were treated effectively and safely.
Data source: An exploratory analysis of data from a four-part phase I trial.
Disclosures: Dr. Rangarajan has received grant or research support from Alnylam Pharmaceuticals, BioMarin Pharmaceutical, Novo Nordisk, Pfizer, and Shire.
Specific polymorphisms excluded in hemophilic arthropathy
Carriers of a hemochromatosis (HFE) gene mutation or a long (GT)n-repeat length within the HMOX1 promoter regions did not appear to have an increase in hemophilic arthropathy.
In 201 blood samples from patients with severe hemophilia A or B and 37 from patients with moderate disease, neither the presence of an HFE mutation nor a long (GT)n-repeat length was associated with an increase in joint damage. The assessment was based on Pettersson score after adjustment for disease severity, presence of inhibitors, annual joint bleeding rate (AJBR), age at Pettersson score and at clinic entrance, and birth cohort (standardized beta = 0.033 and -0.022, respectively), Lize F. van Vulpen, MD, of University Medical Center Utrecht, the Netherlands, reported at the annual meeting of the European Association of Haemophilia and Allied Disorders.
Study subjects had a median age of 43 years, median AJBRs of 2.5 and 0.5 for severe and moderate disease, respectively, and median Pettersson scores of 22 and 4 in the groups, respectively. An HFE mutation was detected in 91 patients, and their levels of ferritin, iron, and transferrin saturation were significantly increased, but other baseline characteristic were similar in those with and without HFE mutation, and regardless of (GT)n-repeat length.
The marked heterogeneity in joint damage seen among hemophilia patients was hypothesized in this study to be associated with differences in iron handling, but the findings failed to support that hypothesis, Dr. van Vulpen concluded.
Dr. van Vulpen reported having no disclosures.
Carriers of a hemochromatosis (HFE) gene mutation or a long (GT)n-repeat length within the HMOX1 promoter regions did not appear to have an increase in hemophilic arthropathy.
In 201 blood samples from patients with severe hemophilia A or B and 37 from patients with moderate disease, neither the presence of an HFE mutation nor a long (GT)n-repeat length was associated with an increase in joint damage. The assessment was based on Pettersson score after adjustment for disease severity, presence of inhibitors, annual joint bleeding rate (AJBR), age at Pettersson score and at clinic entrance, and birth cohort (standardized beta = 0.033 and -0.022, respectively), Lize F. van Vulpen, MD, of University Medical Center Utrecht, the Netherlands, reported at the annual meeting of the European Association of Haemophilia and Allied Disorders.
Study subjects had a median age of 43 years, median AJBRs of 2.5 and 0.5 for severe and moderate disease, respectively, and median Pettersson scores of 22 and 4 in the groups, respectively. An HFE mutation was detected in 91 patients, and their levels of ferritin, iron, and transferrin saturation were significantly increased, but other baseline characteristic were similar in those with and without HFE mutation, and regardless of (GT)n-repeat length.
The marked heterogeneity in joint damage seen among hemophilia patients was hypothesized in this study to be associated with differences in iron handling, but the findings failed to support that hypothesis, Dr. van Vulpen concluded.
Dr. van Vulpen reported having no disclosures.
Carriers of a hemochromatosis (HFE) gene mutation or a long (GT)n-repeat length within the HMOX1 promoter regions did not appear to have an increase in hemophilic arthropathy.
In 201 blood samples from patients with severe hemophilia A or B and 37 from patients with moderate disease, neither the presence of an HFE mutation nor a long (GT)n-repeat length was associated with an increase in joint damage. The assessment was based on Pettersson score after adjustment for disease severity, presence of inhibitors, annual joint bleeding rate (AJBR), age at Pettersson score and at clinic entrance, and birth cohort (standardized beta = 0.033 and -0.022, respectively), Lize F. van Vulpen, MD, of University Medical Center Utrecht, the Netherlands, reported at the annual meeting of the European Association of Haemophilia and Allied Disorders.
Study subjects had a median age of 43 years, median AJBRs of 2.5 and 0.5 for severe and moderate disease, respectively, and median Pettersson scores of 22 and 4 in the groups, respectively. An HFE mutation was detected in 91 patients, and their levels of ferritin, iron, and transferrin saturation were significantly increased, but other baseline characteristic were similar in those with and without HFE mutation, and regardless of (GT)n-repeat length.
The marked heterogeneity in joint damage seen among hemophilia patients was hypothesized in this study to be associated with differences in iron handling, but the findings failed to support that hypothesis, Dr. van Vulpen concluded.
Dr. van Vulpen reported having no disclosures.
FROM EAHAD 2017
Key clinical point:
Major finding: Neither the presence of an HFE mutation, nor a long (GT)n-repeat length was associated with an increase in joint damage as assessed by Pettersson score (standardized beta = 0.033 and –0.022, respectively).
Data source: An evaluation of blood samples from a cohort of 238 patients.
Disclosures: Dr. van Vulpen reported having no disclosures.
Low inhibitor incidence seen with new generation rhFVIII
Human-cl rhFVIII, a new generation recombinant factor VIII of human origin, appears to be associated with a low inhibitor incidence in patients with severe hemophilia A, according to interim findings from the ongoing NuProtect study.
In 66 evaluable previously untreated patients with at least 20 days of exposure to human-cl rhFVIII, the cumulative incidence of high-titer and low-titer inhibitor development was 12.8% and 8.4%, respectively, Ellis J. Neufeld, MD, reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.
The median age at first treatment was 13 months (range of 3-135 months). Of 59 patients with available F8 gene analysis, 44 had high-risk mutations and 47 had null mutations; 1 had no mutation identified. After a median of 11.5 treatment exposure days, 8 of the 66 patients developed high-titer inhibitors and 5 developed low-titer inhibitors; 4 of those were transient, said Dr. Neufeld of Harvard Medical School, Boston.
Only two of the patients developed an inhibitor, including one high- and one low-titer inhibitor, after 20 exposure days. Among the 13 inhibitor patients, 12 had an F8 mutation identified; all were null, and 11 were high risk.
In a prior study of 201 patients with previously treated severe hemophilia A, no inhibitors were reported with human-cl rhFVIII – which is produced in human cells without chemical modification or protein fusion. The NuProtect study is looking at immunogenicity, efficacy, and safety in previously untreated patients. Final data are expected in 2018, Dr. Neufeld noted.
Dr. Neufeld disclosed financial ties to Octapharma, the sponsor of NuProtect, and numerous other pharmaceutical companies.
Human-cl rhFVIII, a new generation recombinant factor VIII of human origin, appears to be associated with a low inhibitor incidence in patients with severe hemophilia A, according to interim findings from the ongoing NuProtect study.
In 66 evaluable previously untreated patients with at least 20 days of exposure to human-cl rhFVIII, the cumulative incidence of high-titer and low-titer inhibitor development was 12.8% and 8.4%, respectively, Ellis J. Neufeld, MD, reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.
The median age at first treatment was 13 months (range of 3-135 months). Of 59 patients with available F8 gene analysis, 44 had high-risk mutations and 47 had null mutations; 1 had no mutation identified. After a median of 11.5 treatment exposure days, 8 of the 66 patients developed high-titer inhibitors and 5 developed low-titer inhibitors; 4 of those were transient, said Dr. Neufeld of Harvard Medical School, Boston.
Only two of the patients developed an inhibitor, including one high- and one low-titer inhibitor, after 20 exposure days. Among the 13 inhibitor patients, 12 had an F8 mutation identified; all were null, and 11 were high risk.
In a prior study of 201 patients with previously treated severe hemophilia A, no inhibitors were reported with human-cl rhFVIII – which is produced in human cells without chemical modification or protein fusion. The NuProtect study is looking at immunogenicity, efficacy, and safety in previously untreated patients. Final data are expected in 2018, Dr. Neufeld noted.
Dr. Neufeld disclosed financial ties to Octapharma, the sponsor of NuProtect, and numerous other pharmaceutical companies.
Human-cl rhFVIII, a new generation recombinant factor VIII of human origin, appears to be associated with a low inhibitor incidence in patients with severe hemophilia A, according to interim findings from the ongoing NuProtect study.
In 66 evaluable previously untreated patients with at least 20 days of exposure to human-cl rhFVIII, the cumulative incidence of high-titer and low-titer inhibitor development was 12.8% and 8.4%, respectively, Ellis J. Neufeld, MD, reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.
The median age at first treatment was 13 months (range of 3-135 months). Of 59 patients with available F8 gene analysis, 44 had high-risk mutations and 47 had null mutations; 1 had no mutation identified. After a median of 11.5 treatment exposure days, 8 of the 66 patients developed high-titer inhibitors and 5 developed low-titer inhibitors; 4 of those were transient, said Dr. Neufeld of Harvard Medical School, Boston.
Only two of the patients developed an inhibitor, including one high- and one low-titer inhibitor, after 20 exposure days. Among the 13 inhibitor patients, 12 had an F8 mutation identified; all were null, and 11 were high risk.
In a prior study of 201 patients with previously treated severe hemophilia A, no inhibitors were reported with human-cl rhFVIII – which is produced in human cells without chemical modification or protein fusion. The NuProtect study is looking at immunogenicity, efficacy, and safety in previously untreated patients. Final data are expected in 2018, Dr. Neufeld noted.
Dr. Neufeld disclosed financial ties to Octapharma, the sponsor of NuProtect, and numerous other pharmaceutical companies.
Key clinical point:
Major finding: The cumulative incidence of high-titer and low-titer inhibitor development was 12.8% and 8.4%, respectively.
Data source: The ongoing NuProtect study of 66 patients.
Disclosures: Dr. Neufeld disclosed financial ties to Octapharma, the sponsor of NuProtect, and numerous other pharmaceutical companies.
Study highlights importance of genotyping in von Willebrand disease
Patients with genetically confirmed von Willebrand disease (VWD) type 2M have a relatively mild clinical phenotype, according to findings from a retrospective cross-sectional study.
In fact, three of 31 patients included in the study had a near normal laboratory phenotype. Additionally, patients with the p.Val1360Ala mutation had significantly higher values of all von Willebrand factor (VWF)-related laboratory parameters, compared with those with the p.Arg1374Cys or p.Phe1293Leu mutation, Dominique Maas reported at the European Association for Haemophilia and Allied Disorders annual meeting.
The findings underscore the importance of genotyping for making a correct diagnosis of VWD type 2M, said Ms. Maas of Radboud University Medical Center, Nijmegen, The Netherlands.
The study subjects, who had a least one VWD type 2M mutation, had a median age of 34 years and a median bleeding score of 6. Most suffered from mucocutaneous bleeding, but with low frequency compared with other VWD subtypes. The incidence of muscle hematomas, postpartum hemorrhage, and postsurgery bleeding were relatively high, however. Age and bleeding score were strongly positively correlated.
Subjects had a median VWF antigen level of 24 IU dL-1, median VWF ristocetin cofactor activity of 6 IU dL-1, and median VSF:RCo/VWF:Ag ratio of 0.29. The VSF collagen binding activity and VWF:Ag ratio was normal, she said.
Genotyping is a powerful diagnostic tool for making an appropriate diagnosis and classification of VWD. The current findings are important because understanding the correlation between genotype and phenotype improves the understanding of VWD pathogenesis and has important implications for treatment, follow-up, and genetic counseling, but has not been throughly investigated in fully genotyped patients with VWD type 2M, she said.
Ms. Maas reported having no disclosures.
Patients with genetically confirmed von Willebrand disease (VWD) type 2M have a relatively mild clinical phenotype, according to findings from a retrospective cross-sectional study.
In fact, three of 31 patients included in the study had a near normal laboratory phenotype. Additionally, patients with the p.Val1360Ala mutation had significantly higher values of all von Willebrand factor (VWF)-related laboratory parameters, compared with those with the p.Arg1374Cys or p.Phe1293Leu mutation, Dominique Maas reported at the European Association for Haemophilia and Allied Disorders annual meeting.
The findings underscore the importance of genotyping for making a correct diagnosis of VWD type 2M, said Ms. Maas of Radboud University Medical Center, Nijmegen, The Netherlands.
The study subjects, who had a least one VWD type 2M mutation, had a median age of 34 years and a median bleeding score of 6. Most suffered from mucocutaneous bleeding, but with low frequency compared with other VWD subtypes. The incidence of muscle hematomas, postpartum hemorrhage, and postsurgery bleeding were relatively high, however. Age and bleeding score were strongly positively correlated.
Subjects had a median VWF antigen level of 24 IU dL-1, median VWF ristocetin cofactor activity of 6 IU dL-1, and median VSF:RCo/VWF:Ag ratio of 0.29. The VSF collagen binding activity and VWF:Ag ratio was normal, she said.
Genotyping is a powerful diagnostic tool for making an appropriate diagnosis and classification of VWD. The current findings are important because understanding the correlation between genotype and phenotype improves the understanding of VWD pathogenesis and has important implications for treatment, follow-up, and genetic counseling, but has not been throughly investigated in fully genotyped patients with VWD type 2M, she said.
Ms. Maas reported having no disclosures.
Patients with genetically confirmed von Willebrand disease (VWD) type 2M have a relatively mild clinical phenotype, according to findings from a retrospective cross-sectional study.
In fact, three of 31 patients included in the study had a near normal laboratory phenotype. Additionally, patients with the p.Val1360Ala mutation had significantly higher values of all von Willebrand factor (VWF)-related laboratory parameters, compared with those with the p.Arg1374Cys or p.Phe1293Leu mutation, Dominique Maas reported at the European Association for Haemophilia and Allied Disorders annual meeting.
The findings underscore the importance of genotyping for making a correct diagnosis of VWD type 2M, said Ms. Maas of Radboud University Medical Center, Nijmegen, The Netherlands.
The study subjects, who had a least one VWD type 2M mutation, had a median age of 34 years and a median bleeding score of 6. Most suffered from mucocutaneous bleeding, but with low frequency compared with other VWD subtypes. The incidence of muscle hematomas, postpartum hemorrhage, and postsurgery bleeding were relatively high, however. Age and bleeding score were strongly positively correlated.
Subjects had a median VWF antigen level of 24 IU dL-1, median VWF ristocetin cofactor activity of 6 IU dL-1, and median VSF:RCo/VWF:Ag ratio of 0.29. The VSF collagen binding activity and VWF:Ag ratio was normal, she said.
Genotyping is a powerful diagnostic tool for making an appropriate diagnosis and classification of VWD. The current findings are important because understanding the correlation between genotype and phenotype improves the understanding of VWD pathogenesis and has important implications for treatment, follow-up, and genetic counseling, but has not been throughly investigated in fully genotyped patients with VWD type 2M, she said.
Ms. Maas reported having no disclosures.
FROM EAHAD 2017
Key clinical point:
Major finding: Three of 31 patients included in the study had a near normal laboratory phenotype.
Data source: A retrospective cross-sectional study of 31 patients.
Disclosures: Ms. Maas reported having no disclosures.
Boys with severe hemophilia have good physical function
Children with severe hemophilia in a U.K. study had generally good self-reported health-related quality of life and physical functioning, but impairment on both measures was greater in those who reported pain.
Of 123 boys with a mean age of 12 years who were included in the multicenter SO-FIT study, 110 had hemophilia A, 25 had a past inhibitor, and 9 had a current inhibitor. Prophylactic treatment was given in 120 of the boys, Kate Khair, PhD of Great Ormond Street Hospital for Children, London, reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.
In the preceding 6 months, participants experienced a median of 0 joint bleeds (range of 0-8), and a median Hemophilia Joint Health Score (HJHS) of 1 (range, 0-37). Physical function scores were good; the Haemophilia & Exercise Project questionnaire (HEP-Test-Q) mean score was 80.82, with the highest impairments seen in the domain of “endurance” (mean, 72.21), and the Paediatric Haemophilia Activities List (PedHAL) mean score was 85.13, with the highest impairments seen in the domains of “leisure activities and sports” and “lying/sitting/kneeling/standing” (mean, 82.04 and 82.97, respectively).
Health-related quality of life as assessed by the Haemo-QoL Short Form was also generally good (mean, 23.07), with the highest impairments seen in the domains of “friends” and “family” (mean, 27.08 and 26.59, respectively).
In the 27% of participants with pain, a high correlation was seen between the HEP-Test-Q and Haemo-QoL, and moderate correlation was seen between the PedHAL and Haemo-QoL, which implies that good physical functioning is related to good health-related quality of life, Dr. Khair explained.
In fact, patients who said they often or always had pain reported significantly worse subjective physical functioning in all HEP-Test-Q and PedHAL domains, as well as higher impairments in their HRQoL vs. those who said they sometimes, rarely, or never experienced pain, she said.
Interestingly, data completion by study participants was improved with use of an iPad vs. “paper and pencil” for questionnaire completion, Dr. Khair said in an interview.
“They preferred this method – it was more in keeping with how they communicate and learn at school,” she said, noting that the iPad database was set up to give real time scores, which could then be used to tailor assessments.
This is an approach that could be undertaken at home pre-clinic visits, she said.
“Gaining the views of children and young adults in patient-reported outcomes is complex, but reveals their views of their care and their lives – an area we should address more,” she added.
Dr. Khair received grant or research support from Pfizer ASPIRE.
Children with severe hemophilia in a U.K. study had generally good self-reported health-related quality of life and physical functioning, but impairment on both measures was greater in those who reported pain.
Of 123 boys with a mean age of 12 years who were included in the multicenter SO-FIT study, 110 had hemophilia A, 25 had a past inhibitor, and 9 had a current inhibitor. Prophylactic treatment was given in 120 of the boys, Kate Khair, PhD of Great Ormond Street Hospital for Children, London, reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.
In the preceding 6 months, participants experienced a median of 0 joint bleeds (range of 0-8), and a median Hemophilia Joint Health Score (HJHS) of 1 (range, 0-37). Physical function scores were good; the Haemophilia & Exercise Project questionnaire (HEP-Test-Q) mean score was 80.82, with the highest impairments seen in the domain of “endurance” (mean, 72.21), and the Paediatric Haemophilia Activities List (PedHAL) mean score was 85.13, with the highest impairments seen in the domains of “leisure activities and sports” and “lying/sitting/kneeling/standing” (mean, 82.04 and 82.97, respectively).
Health-related quality of life as assessed by the Haemo-QoL Short Form was also generally good (mean, 23.07), with the highest impairments seen in the domains of “friends” and “family” (mean, 27.08 and 26.59, respectively).
In the 27% of participants with pain, a high correlation was seen between the HEP-Test-Q and Haemo-QoL, and moderate correlation was seen between the PedHAL and Haemo-QoL, which implies that good physical functioning is related to good health-related quality of life, Dr. Khair explained.
In fact, patients who said they often or always had pain reported significantly worse subjective physical functioning in all HEP-Test-Q and PedHAL domains, as well as higher impairments in their HRQoL vs. those who said they sometimes, rarely, or never experienced pain, she said.
Interestingly, data completion by study participants was improved with use of an iPad vs. “paper and pencil” for questionnaire completion, Dr. Khair said in an interview.
“They preferred this method – it was more in keeping with how they communicate and learn at school,” she said, noting that the iPad database was set up to give real time scores, which could then be used to tailor assessments.
This is an approach that could be undertaken at home pre-clinic visits, she said.
“Gaining the views of children and young adults in patient-reported outcomes is complex, but reveals their views of their care and their lives – an area we should address more,” she added.
Dr. Khair received grant or research support from Pfizer ASPIRE.
Children with severe hemophilia in a U.K. study had generally good self-reported health-related quality of life and physical functioning, but impairment on both measures was greater in those who reported pain.
Of 123 boys with a mean age of 12 years who were included in the multicenter SO-FIT study, 110 had hemophilia A, 25 had a past inhibitor, and 9 had a current inhibitor. Prophylactic treatment was given in 120 of the boys, Kate Khair, PhD of Great Ormond Street Hospital for Children, London, reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.
In the preceding 6 months, participants experienced a median of 0 joint bleeds (range of 0-8), and a median Hemophilia Joint Health Score (HJHS) of 1 (range, 0-37). Physical function scores were good; the Haemophilia & Exercise Project questionnaire (HEP-Test-Q) mean score was 80.82, with the highest impairments seen in the domain of “endurance” (mean, 72.21), and the Paediatric Haemophilia Activities List (PedHAL) mean score was 85.13, with the highest impairments seen in the domains of “leisure activities and sports” and “lying/sitting/kneeling/standing” (mean, 82.04 and 82.97, respectively).
Health-related quality of life as assessed by the Haemo-QoL Short Form was also generally good (mean, 23.07), with the highest impairments seen in the domains of “friends” and “family” (mean, 27.08 and 26.59, respectively).
In the 27% of participants with pain, a high correlation was seen between the HEP-Test-Q and Haemo-QoL, and moderate correlation was seen between the PedHAL and Haemo-QoL, which implies that good physical functioning is related to good health-related quality of life, Dr. Khair explained.
In fact, patients who said they often or always had pain reported significantly worse subjective physical functioning in all HEP-Test-Q and PedHAL domains, as well as higher impairments in their HRQoL vs. those who said they sometimes, rarely, or never experienced pain, she said.
Interestingly, data completion by study participants was improved with use of an iPad vs. “paper and pencil” for questionnaire completion, Dr. Khair said in an interview.
“They preferred this method – it was more in keeping with how they communicate and learn at school,” she said, noting that the iPad database was set up to give real time scores, which could then be used to tailor assessments.
This is an approach that could be undertaken at home pre-clinic visits, she said.
“Gaining the views of children and young adults in patient-reported outcomes is complex, but reveals their views of their care and their lives – an area we should address more,” she added.
Dr. Khair received grant or research support from Pfizer ASPIRE.
FROM EAHAD 2017
Key clinical point:
Major finding: Physical function score (HEP-Test-Q) was a mean of 80.82, with the highest impairments seen in the domain of “endurance” (mean, 72.21).
Data source: The SO-FIT study of 123 boys with severe hemophilia.
Disclosures: Dr. Khair received grant or research support from Pfizer ASPIRE.
ITI protects against bleeding in hemophilia A with factor VIII inhibitors
Immune tolerance induction, or ITI, in hemophilia A patients with inhibitor development against factor VIII (FVIII) appears to provide some protection against bleeding, as bleeding during ITI in patients from the PedNet registry was dependent on inhibitor titer and ITI regimen, according to Kathelijn Fischer, MD.
Of 218 registry patients who were born during 1990-2009 and who had clinically relevant inhibitors and available data on joint bleeding, 157 had bleeding for at least 3 months. They were followed for a median of 26 months starting at age 16 months, and most had high titer inhibitors (52% had titers of 5-199 BU, and 32% had titers greater than 200 BU).
The bleeding rates in 12 patients without ITI who were on prophylaxis were similar to those in 89 such patients without prophylaxis (0.3 and 0.4 bleeds/month, respectively); no significant difference was seen between the groups based on inhibitor titer, Dr. Fischer of University Medical Center Utrecht, The Netherlands reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.
Similarly, the bleeding rate during ITI among those on prophylaxis did not differ significantly from the rate in those without prophylaxis (0.4 vs. 0.3/month, respectively), but the rate did increase significantly according to inhibitor titer: The rate increased from 0.05/month in the group with less than 5 BU, to 0.2/month in those with 5-199 BU, and to 0.5/month in the group with greater than 200 BU.
Further, while ITI dose did not affect bleeding, dosing frequency had a strong effect. The median rate with nondaily dosing in 36 patients vs. daily dosing in 63 patients was 0.4/month vs. 0.2/month, respectively, Dr. Fischer said.
She reported having no disclosures.
Immune tolerance induction, or ITI, in hemophilia A patients with inhibitor development against factor VIII (FVIII) appears to provide some protection against bleeding, as bleeding during ITI in patients from the PedNet registry was dependent on inhibitor titer and ITI regimen, according to Kathelijn Fischer, MD.
Of 218 registry patients who were born during 1990-2009 and who had clinically relevant inhibitors and available data on joint bleeding, 157 had bleeding for at least 3 months. They were followed for a median of 26 months starting at age 16 months, and most had high titer inhibitors (52% had titers of 5-199 BU, and 32% had titers greater than 200 BU).
The bleeding rates in 12 patients without ITI who were on prophylaxis were similar to those in 89 such patients without prophylaxis (0.3 and 0.4 bleeds/month, respectively); no significant difference was seen between the groups based on inhibitor titer, Dr. Fischer of University Medical Center Utrecht, The Netherlands reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.
Similarly, the bleeding rate during ITI among those on prophylaxis did not differ significantly from the rate in those without prophylaxis (0.4 vs. 0.3/month, respectively), but the rate did increase significantly according to inhibitor titer: The rate increased from 0.05/month in the group with less than 5 BU, to 0.2/month in those with 5-199 BU, and to 0.5/month in the group with greater than 200 BU.
Further, while ITI dose did not affect bleeding, dosing frequency had a strong effect. The median rate with nondaily dosing in 36 patients vs. daily dosing in 63 patients was 0.4/month vs. 0.2/month, respectively, Dr. Fischer said.
She reported having no disclosures.
Immune tolerance induction, or ITI, in hemophilia A patients with inhibitor development against factor VIII (FVIII) appears to provide some protection against bleeding, as bleeding during ITI in patients from the PedNet registry was dependent on inhibitor titer and ITI regimen, according to Kathelijn Fischer, MD.
Of 218 registry patients who were born during 1990-2009 and who had clinically relevant inhibitors and available data on joint bleeding, 157 had bleeding for at least 3 months. They were followed for a median of 26 months starting at age 16 months, and most had high titer inhibitors (52% had titers of 5-199 BU, and 32% had titers greater than 200 BU).
The bleeding rates in 12 patients without ITI who were on prophylaxis were similar to those in 89 such patients without prophylaxis (0.3 and 0.4 bleeds/month, respectively); no significant difference was seen between the groups based on inhibitor titer, Dr. Fischer of University Medical Center Utrecht, The Netherlands reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.
Similarly, the bleeding rate during ITI among those on prophylaxis did not differ significantly from the rate in those without prophylaxis (0.4 vs. 0.3/month, respectively), but the rate did increase significantly according to inhibitor titer: The rate increased from 0.05/month in the group with less than 5 BU, to 0.2/month in those with 5-199 BU, and to 0.5/month in the group with greater than 200 BU.
Further, while ITI dose did not affect bleeding, dosing frequency had a strong effect. The median rate with nondaily dosing in 36 patients vs. daily dosing in 63 patients was 0.4/month vs. 0.2/month, respectively, Dr. Fischer said.
She reported having no disclosures.
FROM EAHAD 2017
Key clinical point:
Major finding: Median bleeding rate with nondaily vs. daily ITI dosing was 0.4/month vs. 0.2/month, respectively.
Data source: An analysis of 218 patients from the PedNet registry.
Disclosures: Dr. Fischer reported having no disclosures.
Study: No link between vaccines, inhibitor development
The administration of pediatric vaccinations in close proximity to factor VIII (FVIII) exposure was not associated with inhibitor development in previously untreated patients with severe hemophilia A in the PedNet Registry.
Similarly, no association was seen between recurrent vaccinations and inhibitor development, Dr. van den Berg reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.
Inhibitor development in this patient population is a multifactorial event, but these findings show no association between vaccinations administered early in life and increased inhibitor risk, she concluded.
Dr. van den Berg received grant/research support from Bayer, Baxalta, Pfizer, CSI, and Grifols.
The administration of pediatric vaccinations in close proximity to factor VIII (FVIII) exposure was not associated with inhibitor development in previously untreated patients with severe hemophilia A in the PedNet Registry.
Similarly, no association was seen between recurrent vaccinations and inhibitor development, Dr. van den Berg reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.
Inhibitor development in this patient population is a multifactorial event, but these findings show no association between vaccinations administered early in life and increased inhibitor risk, she concluded.
Dr. van den Berg received grant/research support from Bayer, Baxalta, Pfizer, CSI, and Grifols.
The administration of pediatric vaccinations in close proximity to factor VIII (FVIII) exposure was not associated with inhibitor development in previously untreated patients with severe hemophilia A in the PedNet Registry.
Similarly, no association was seen between recurrent vaccinations and inhibitor development, Dr. van den Berg reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.
Inhibitor development in this patient population is a multifactorial event, but these findings show no association between vaccinations administered early in life and increased inhibitor risk, she concluded.
Dr. van den Berg received grant/research support from Bayer, Baxalta, Pfizer, CSI, and Grifols.
FROM EAHAD 2017
Key clinical point:
Major finding: The adjusted hazard ratio for any inhibitor development related to vaccinations in close proximity to FVIII was 0.65.
Data source: A review of data from 375 children in the PedNet Registry.
Disclosures: Dr. van den Berg received grant/research support from Bayer, Baxalta, Pfizer, CSI, and Grifols.
AHEAD studies establish bleed rate benchmarks
The findings from a large cohort study of patients with moderate and severe hemophilia A have supplied benchmarks that can be used in developing new treatments, Alessandro Gringeri, MD, reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.*
More than 37% of 869 patients with moderate or severe hemophilia A who were on prophylaxis and who were enrolled in the noninterventional, prospective, long-term AHEAD international and German cohort studies experienced less than one bleed per year on average, and 50% had an annual bleed rate of less than two.
Furthermore, a median of 56% of those on prophylaxis had an annual joint bleed rate (AJBR) of less than one, and nearly 70% had an AJBR of less than two. Study subjects were enrolled from 22 countries at a mean age at screening of 23.4 years. Most (67%) had severe hemophilia A, and 79% were on prophylaxis, said Dr. Gringeri of Global Medical Affairs Hematology, Shire, Austria.
Among patients in the international arm and the German arm of the study, the median annual bleed rates, respectively, were 1.2 and 2.5 in year 1, 1.2 and 2.2 in year 2, and 1.9 in each arm in year 3. Median AJBRs were 0.9 in each arm in year 1, 0.9 and 0 in year 2, and 1.0 and 0.8 in year 3.
The data provide a valid benchmark for new products and therapeutic approaches, Dr. Gringeri concluded.
Dr. Gringeri is an employee of Shire.
CORRECTION 2/11/17: An earlier version of this article misstated the presenting author's name.
The findings from a large cohort study of patients with moderate and severe hemophilia A have supplied benchmarks that can be used in developing new treatments, Alessandro Gringeri, MD, reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.*
More than 37% of 869 patients with moderate or severe hemophilia A who were on prophylaxis and who were enrolled in the noninterventional, prospective, long-term AHEAD international and German cohort studies experienced less than one bleed per year on average, and 50% had an annual bleed rate of less than two.
Furthermore, a median of 56% of those on prophylaxis had an annual joint bleed rate (AJBR) of less than one, and nearly 70% had an AJBR of less than two. Study subjects were enrolled from 22 countries at a mean age at screening of 23.4 years. Most (67%) had severe hemophilia A, and 79% were on prophylaxis, said Dr. Gringeri of Global Medical Affairs Hematology, Shire, Austria.
Among patients in the international arm and the German arm of the study, the median annual bleed rates, respectively, were 1.2 and 2.5 in year 1, 1.2 and 2.2 in year 2, and 1.9 in each arm in year 3. Median AJBRs were 0.9 in each arm in year 1, 0.9 and 0 in year 2, and 1.0 and 0.8 in year 3.
The data provide a valid benchmark for new products and therapeutic approaches, Dr. Gringeri concluded.
Dr. Gringeri is an employee of Shire.
CORRECTION 2/11/17: An earlier version of this article misstated the presenting author's name.
The findings from a large cohort study of patients with moderate and severe hemophilia A have supplied benchmarks that can be used in developing new treatments, Alessandro Gringeri, MD, reported at the annual meeting of the European Association for Haemophilia and Allied Disorders.*
More than 37% of 869 patients with moderate or severe hemophilia A who were on prophylaxis and who were enrolled in the noninterventional, prospective, long-term AHEAD international and German cohort studies experienced less than one bleed per year on average, and 50% had an annual bleed rate of less than two.
Furthermore, a median of 56% of those on prophylaxis had an annual joint bleed rate (AJBR) of less than one, and nearly 70% had an AJBR of less than two. Study subjects were enrolled from 22 countries at a mean age at screening of 23.4 years. Most (67%) had severe hemophilia A, and 79% were on prophylaxis, said Dr. Gringeri of Global Medical Affairs Hematology, Shire, Austria.
Among patients in the international arm and the German arm of the study, the median annual bleed rates, respectively, were 1.2 and 2.5 in year 1, 1.2 and 2.2 in year 2, and 1.9 in each arm in year 3. Median AJBRs were 0.9 in each arm in year 1, 0.9 and 0 in year 2, and 1.0 and 0.8 in year 3.
The data provide a valid benchmark for new products and therapeutic approaches, Dr. Gringeri concluded.
Dr. Gringeri is an employee of Shire.
CORRECTION 2/11/17: An earlier version of this article misstated the presenting author's name.
FROM EAHAD 2017
Key clinical point:
Major finding: 37% of hemophilia A patients on prophylaxis experienced less than one bleed per year on average.
Data source: The prospective long-term AHEAD cohort studies, including 869 patients.
Disclosures: Dr. Gringeri is an employee of Shire.