Phase 3 Study of Efgartigimod IV for Adults With Primary Immune Thrombocytopenia ITP to Assess Safety and Effectiveness

What this Trial Is About

Researchers are evaluating the effects and safety of efgartigimod given intravenously in adults with primary immune thrombocytopenia ITP, a condition where the immune system attacks platelets. This phase 3 clinical trial aims to determine how well efgartigimod controls platelet counts compared to a placebo during a 24-week double-blinded treatment period. The study is sponsored by argenx and includes follow-up periods to monitor ongoing effects and safety. Participants will be randomly assigned in a 21 ratio to receive either efgartigimod IV or placebo IV during the double-blinded treatment period. After this, all participants will receive efgartigimod IV during a first 52-week open-label treatment phase, followed by an optional second 52-week open-label phase. After completing these treatment periods, participants will have an approximately 8-week follow-up while off the study drug, with total study participation lasting up to 138 weeks. During the study, participants will have regular blood tests to measure platelet counts and assess disease control. Researchers will track the number of weeks participants maintain platelet counts above specified levels and monitor any bleeding events or adverse effects. Safety is closely observed throughout the trial, including antibody responses to the drug. Participants will have scheduled visits and assessments throughout treatment and follow-up to gather comprehensive data on efgartigimods impact.

A Study to Assess the Efficacy and Safety of Efgartigimod IV in Adult Participants With Primary Immune Thrombocytopenia