Overview Cooperative Study of Factor VIII Inhibitors Status: Completed Trial end date: 1979-07-01 Target enrollment: 0 Participant gender: Male Summary To test the efficacy of prothrombin complex concentrates (Factor IX) in the treatment of hemophiliac patients who had inhibitors to Factor VIII. Phase: Phase 3Accepts Healthy Volunteers? No Details Lead Sponsor: National Heart, Lung, and Blood Institute (NHLBI) Criteria Males with hemophilia, not stratified as to ethnic group.