- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01571934
Inhibitor Development in Patients With Hemophilia A Undergoing Surgery (PASs)
Study Overview
Status
Conditions
Detailed Description
The development of neutralizing anti-factor VIII (fVIII) antibodies, fVIII inhibitor, is the most significant complication affecting patients with hemophilia A (HA). Once an inhibitor develops, treatment is less effective and costly. Although inhibitors occur most commonly in those with severe HA, 25% of new inhibitors occur in those with non-severe HA. In patients with non-severe HA, the development of a fVIII inhibitor can change the course of disease from one that is easily managed to one with the potential for spontaneous life-threatening difficult to treat bleeding. Although significant advances have been made in understanding risk factors for fVIII inhibitor development in patients with severe HA, studies that seek to understand the risk for fVIII inhibitor development in those with non-severe disease have been limited to retrospective analyses. In these retrospective analyses, intensive fVIII treatment and surgery have been identified as risk factors for fVIII inhibitor development in non-severe HA. Additionally, receiving fVIII by continuous infusion has been associated with fVIII inhibitor development in non-severe HA in some but not all studies and may be due in part to a more robust proinflammatory response during continuous infusion. Accordingly, the next logical step to evaluate the risk of inhibitor development associated with continuous fVIII infusion is a prospective observational cohort study. Additionally, knowledge of the immune response to fVIII in the surgical setting is essential for identification of patients at high risk for inhibitor development and development of strategies to prevent inhibitor development and is best evaluated in the setting of an prospective cohort study.
This multicenter prospective observational cohort study will enroll a total of 140 subjects at 10 centers who have mild or moderate hemophilia a (fVIII activity 1-40%) who are scheduled to undergo surgery for which at least 5 consecutive days of fVIII replacement therapy is required. The study will gather clinical data and collect blood specimens on 4 occasions over a 3 month period. Outcomes include: inhibitor development, total fVIII usage, bleeding, and markers of T cell activation.
Study Type
Enrollment (Actual)
Contacts and Locations
Study Locations
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Colorado
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Aurora, Colorado, United States, 80045
- University of Colorado, Hemophilia and Thrombosis Center
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Georgia
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Atlanta, Georgia, United States, 30322
- Emory University Comprehensive Hemophilia Treatment Center
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Indiana
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Indianapolis, Indiana, United States, 46260
- Indiana Hemophilia and Thrombosis Center
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North Carolina
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Chapel Hill, North Carolina, United States, 27599-7035
- University of North Carolina
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Oregon
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Portland, Oregon, United States, 97239
- Oregon Health & Science University
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Pennsylvania
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Pittsburgh, Pennsylvania, United States, 15213
- University of Pittsburgh and Hemophilia Center of Pennsylvania
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Texas
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Houston, Texas, United States, 77030
- The University of Texas Health Science Center at Houston
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
- Child
- Adult
- Older Adult
Accepts Healthy Volunteers
Genders Eligible for Study
Sampling Method
Study Population
Description
Inclusion Criteria:
- Males with mild/moderate hemophilia A (fVIII activity 1-40%)
- Planned surgical intervention which is anticipated to require 5 consecutive days of fVIII replacement therapy (These can be outpatient or inpatient treatment days.)
- Weight >22.5 kg (To assure that volumes of blood to be drawn for study purposes are safe.)
Exclusion Criteria:
- Past history of an inhibitor (inhibitor titer >0.4 BU/ml)
- HIV infection with CD4 count <400/ul
- Currently receiving immunosuppressive medication(s)
- Unable to tolerate quantity of blood to be drawn
- Current or past diagnosis autoimmune disorder
- Current or past diagnosis of immune deficiency disorder other than HIV
Study Plan
How is the study designed?
Design Details
Cohorts and Interventions
Group / Cohort |
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Mild or moderate hemophilia A
Subjects with mild or moderate hemophilia A (fVIII activity 1-40%) who are scheduled to undergo surgery for which at least 5 consecutive days of fVIII replacement therapy is required.
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Inhibitor development (inhibitor titer > 0.4 BU/ml)
Time Frame: postopereratvie date 90
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Primary Study Endpoint: Inhibitor development (inhibitor titer > 0.4 BU/ml) by post-operative (POD) day 90.
Three months or 90 days was selected as the primary end point based on data collected in the case-control study where 17/18 cases had developed their inhibitor within 12 weeks of their intensive fVIII treatment and only 1 case developed the inhibitor >16 weeks after the intensive fVIII treatment.
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postopereratvie date 90
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Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Christine Kempton, MD, MSc, Emory University
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- IRB00046800
- PASS (Other)
- 5K23HL105785 (U.S. NIH Grant/Contract)
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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