Evaluation of Weekly Marstacimab Injections in Male Children Aged 1 to 17 With Severe Hemophilia A or Moderate to Severe Hemophilia B

What this Trial Is About

Researchers are evaluating the safety and effects of marstacimab, a study medicine, for potential treatment of hemophilia in boys and male children aged 1 to 17 years. The trial focuses on those with severe Hemophilia A or moderately severe to severe Hemophilia B, including participants with or without inhibitors. The study aims to compare participants experiences with marstacimab to their historical bleeding episodes without the medicine. All participants will receive weekly subcutaneous injections of marstacimab. The first dose is administered at the study site by staff, and subsequent doses can be given at home or by study staff during the 12-month treatment period. Enrollment opens sequentially by age groups, starting with adolescents 12-17 years, followed by children 6-11 years, and finally children 1-5 years. The study includes about 1 month of screening, 12 months of treatment, and 1 month of follow-up. Participants will visit the study site at least 10 times during the study, with the option for two visits to occur at home if allowed. They will also receive six phone calls approximately every two months. Researchers will monitor bleeding rates, adverse events, injection site reactions, and immune responses. The overall participation lasts about 14 months, including screening, treatment, and follow-up periods.

A Clinical Trial of Study Medicine (Marstacimab) in Pediatric Patients With Hemophilia A or Hemophilia B