A Phase 3 Study to Evaluate the Safety and Effectiveness of PF-06823859 in Adults with Active Dermatomyositis or Polymyositis

What this Trial Is About

Researchers are evaluating how the study medicine PF-06823859 dazukibart works in adults with idiopathic inflammatory myopathies, specifically dermatomyositis DM and polymyositis PM. These conditions cause muscle inflammation leading to weakness and may include a skin rash in DM. The study aims to assess the safety and effects of dazukibart compared to a placebo in people receiving stable doses of corticosteroids or immunosuppressants. Participants will receive either the study medicine or a placebo through an intravenous infusion lasting about one hour. These infusions occur every four weeks from Day 1 through Week 48 at the study site. The study is randomized and double-blind, meaning neither participants nor researchers know who gets the medicine or placebo during the trial. Participants will be involved for about 13 months, attending 15 visits at the study site. During these visits, muscle strength, skin condition, physical function, fatigue, itch, and corticosteroid use are assessed. The main measurement is the Total Improvement Score at 24 or 52 weeks depending on location. Safety and other symptom measures will be monitored throughout the study period.

A Study to Understand How the Study Medicine (PF-06823859) Works in People With Active Idiopathic Inflammatory Myopathies [Dermatomyositis (DM) and Polymyositis (PM)]