argenx NV ADRPhase 3 trial met primary endpoint with significant efficacy in autoimmune myositis.

argenx announced positive topline results from its Phase 3 ALKIVIA study of efgartigimod in adults with autoimmune myositis, meeting the primary endpoint of mean Total Improvement Score at Week 52 in the combined immune-mediated necrotizing myopathy and dermatomyositis population with a p-value of 0.0011. Patients treated with efgartigimod showed a 15.4-point greater improvement versus placebo, with benefits emerging by Week 4 and sustained through the full year even with steroid tapering. In prespecified subtype analyses, the primary endpoint was also met in immune-mediated necrotizing myopathy patients with a 14.8-point greater improvement, while dermatomyositis patients showed a clinically meaningful 14.5-point improvement that did not reach statistical significance in the smaller cohort. The safety profile was consistent with prior studies, and detailed results will be presented at an upcoming medical meeting.
argenx NV ADRPhase 3 trial met primary endpoint with significant efficacy in autoimmune myositis.