Long-Term Safety and Effectiveness of Mezagitamab Injection in Adults with Chronic Primary Immune Thrombocytopenia

What this Trial Is About

Primary immune thrombocytopenia ITP is a condition where the immune system mistakenly destroys platelets, leading to a lower number of platelets and increased risk of bruising or bleeding. This Phase 3 study evaluates the long-term safety, tolerability, and effectiveness of mezagitamab in adults with chronic primary ITP. The study also investigates how the body processes mezagitamab over an extended period. Participants who completed previous mezagitamab studies TAK-079-3002 or TAK-079-1004 will be invited to join this continuation trial. Eligible participants may receive mezagitamab injections on demand, with treatment courses repeated as needed based on specific criteria and the investigators clinical judgment. The treatment is administered subcutaneously. During the study, participants will visit the clinic several times for assessments. Researchers will monitor safety by tracking treatment-emergent adverse events, and evaluate effectiveness through platelet response and remission rates. Measurements of drug levels and antibodies will also be taken. The study may last up to approximately 108 weeks, allowing detailed long-term follow-up.

A Follow-up Study of Mezagitamab in Adults With Chronic Primary Immune Thrombocytopenia