Last updated on January 2019

ATHN 2: Factor Switching Study


Are you eligible to participate in this study?

You may be eligible for this study if you meet the following criteria:

  • Conditions: Hemophilia A
  • Age: - 100 Years
  • Gender: Male or Female

Inclusion Criteria

  • Moderate or Severe Congenital Hemophilia A or B (FVIII or FIX clotting activity less than or equal to 5% of normal).
  • Able to give informed consent (by patient or parent/authorized guardian).
  • Previously treated with plasma-derived or recombinant clotting factor replacement products with at least 50 exposure days (as assessed either from direct clinical records in children under age 5, or by clinical history of dosing in older patients). For Arm B being enrolled retrospectively, this previous treatment must be prior to product switch under study.
  • Planning to switch, or recently switched within the previous 50 weeks, to a new brand or type of replacement factor VIII or IX, FDA approved after January 1, 2013.
  • Arm B only: Negative inhibitor screen within the last 6 months prior to switching.

Note: History of prior transient inhibitor or inhibitor eradicated by immune tolerance induction (ITI) are eligible.

Exclusion Criteria

  • Presence of any known bleeding disorder other than hemophilia A or B (i.e., patients with concurrent hemophilia and a second hemostatic defect are NOT eligible). Low Von Willebrand Factor (VWF) without VWF diagnosis are not excluded.
  • Presence of an active inhibitor >0.6 BU for factor VIII, > 0.4 BU for factor IX at the time of eligibility assessment. Detection of such an inhibitor at the baseline visit prior to dosing with the new product (Arm A), or after dosing with new factor dosing (Arm B), would result in early termination without other study assessments.
  • Currently undergoing ITI.
  • Immunosuppressive therapy (cyclophosphamide, mycophenolate, IVIG) within 90 days and Rituximab within 6 months; topical steroid treatments and short course steroids for asthma or allergy allowed.
  • Previous participation in Phase I, II or III interventional trials of the factor product being switched to.

Recruitment Status: Open


Brief Description Eligibility Contact Research Team


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