Efeler

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.

Primary immune thrombocytopenia ITP is a condition where the immune system mistakenly destroys platelets, the cells responsible for blood clotting, resulting in increased bleeding and bruising. This trial evaluates whether mezagitamab given as a subcutaneous injection can effectively maintain stable platelet counts in adults with chronic ITP compared to a placebo. The study is a phase 3, randomized, double-blind, placebo-controlled trial designed to assess both the efficacy and safety of mezagitamab in this population. Participants are randomly assigned to receive either mezagitamab or a matching placebo by subcutaneous injection once weekly. The treatment schedule consists of 8 weekly doses followed by an 8-week break, then another 8 weekly doses, totaling up to 6 months of treatment. Those who finish this trial or do not respond to treatment by week 16 may have the option to join a continuation study to receive open-label mezagitamab if eligible and if the site is open. During the study, participants will visit the clinic multiple times for treatment and monitoring. Researchers will measure platelet responses, symptom changes using patient questionnaires, bleeding events, and blood concentrations of mezagitamab. Safety assessments include monitoring for anti-drug antibodies and adverse events. The primary outcome is the percentage of participants with a durable platelet response up to week 24. The trial is expected to complete in March 2028.