Clinical Trials Logo

Clinical Trial Summary

Commercial one and two-stage factor VIII assays may not detect some clinically significant inhibitor antibodies. The purpose of the proposed study is to standardize and validate a platelet-based factor VIII activity assay with greater sensitivity to clinically important inhibitory antibodies. Investigators will evaluate the platelet-dependent inhibitory activity vs. conventional inhibitory activity in stored patient plasmas and correlate to bleeding histories


Clinical Trial Description

Factor VIII activity assays are used to diagnose hemophilia A, to monitor treatment of these patients, to determine when inhibitory antibodies against factor VIII have developed, and to evaluate the activity of engineered pharmaceutical factor VIII products. Factor VIII activity has been measured with one and two-stage assays for more than fifty years. However, all existing assays have major shortcomings that are recognized by the FDA, the International Society for Thrombosis and Haemostasis, and pharmaceutical companies. The major deficiencies that have been identified are: 1) Factor VIII activity levels do not predict the risk of bleeding in patients with inhibitory antibodies. The degree of inhibition in these assays is less than required to explain patient bleeding. 2) The assays are only accurate over a range of 1 - 100% of normal factor VIII activity, while values of 0.1 - 1% are also clinically important. 3) The different approved assays give discrepant values for recombinant pharmaceutical factor VIII products, with a range of 2-fold difference between assays. This can lead to clinically important differences in dosing of factor VIII products from one region to another with corresponding risk of thrombosis or bleeding. The preliminary data identify an additional deficiency of commercial assays that has not been anticipated. Commercial one and two-stage assays may not detect some clinically significant inhibitor antibodies. Thus, the purpose of the proposed studies is to standardize and validate a platelet-based factor VIII activity assay with greater sensitivity to clinically important inhibitory antibodies. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT02726139
Study type Observational
Source Boston VA Research Institute, Inc.
Contact
Status Withdrawn
Phase
Start date July 15, 2016
Completion date January 25, 2021

See also
  Status Clinical Trial Phase
Completed NCT03834727 - Characterizing the Impact and Treatment of Reproductive Tract Bleeding on Women and Post-menarchal Girls With Bleeding Disorders
Completed NCT03191799 - A Study to Evaluate the Safety and Tolerability of Prophylactic Emicizumab in Hemophilia A Patients With Inhibitors Phase 3
Completed NCT01599819 - BAX 855 Dose-Escalation Safety Study Phase 1
Terminated NCT04541628 - Safety & Efficacy of Encapsulated Allogeneic FVIII Cell Therapy in Haemophilia A Phase 1/Phase 2
Completed NCT02847637 - A Clinical Trial to Evaluate Prophylactic Emicizumab Versus no Prophylaxis in Hemophilia A Participants Without Inhibitors Phase 3
Completed NCT04072237 - Study of Coagulation Faction VIIa Variant Marzeptacog Alfa (Activated) in Adult Subjects With Hemophilia Phase 1
Completed NCT04085458 - Study to Gain More Information on How Safe and Effective Jivi Works in Patients With Severe Hemophilia A (Post-marketing Investigation) Phase 4
Completed NCT04565236 - A Post Approval Commitment Study to Gain More Information on How Safe and Effective KOVALTRY is in Chinese Children, Adolescents /Adults With Severe Hemophilia A Phase 4
Recruiting NCT05987449 - A Study to Evaluate the Safety, Tolerability, Pharmacokinetics, Pharmacodynamics, and Efficacy of NXT007 in Persons With Severe or Moderate Hemophilia A Phase 1/Phase 2
Active, not recruiting NCT04621916 - Preventing Inhibitor Recurrence Indefinitely Phase 4
Not yet recruiting NCT02888223 - Pharmacokinetic Study of SCT800 in Previously Treated Patients With Hemophilia A Phase 1
Completed NCT02528968 - National Study of a Pharmacokinetic-Focused Educational Package for Patients With Severe Haemophilia A N/A
Completed NCT02225483 - Phenotypic Heterogeneity in Hemophilia A: An Investigation of the Role of Platelet Function N/A
Completed NCT02199717 - An Institutional Pilot Study to Investigate Physical Activity Patterns in Boys With Hemophilia N/A
Completed NCT01217255 - Comparing the Burden of Illness of Hemophilia in the Developing and the Developed World
Completed NCT00969319 - Effekt-2 - Efficacy and Safety of Long-term Treatment With KOGENATE® FS in Latin America N/A
Terminated NCT00995046 - Individually Tailored Prophylaxis in Patients With Severe Hemophilia A N/A
Completed NCT00868530 - Study Evaluating On-Demand Treatment Of Xyntha In Chinese Subjects Phase 3
Completed NCT00839202 - Activity and Content of Factor VIII (FVIII) in Human Plasma: The Assessment of a Novel Immunoassay N/A
Completed NCT00629837 - Pharmacokinetics and Safety of a Single Intravenous Infusion of BAY 79-4980 Phase 1