AstraZeneca
The purpose of this multicenter, randomized, placebo-controlled and double-blind study is to evaluate the efficacy and safety of subcutaneous anifrolumab compared with placebo on the overall disease activity in participants with moderate to severe Idiopathic Inflammatory Myopathies (IIM) \[polymyositis (PM) or dermatomyositis (DM)\] while receiving standard of care (SoC) treatment.
Capable of giving informed consent. Inclusion Criteria: 1. 18 - 75 years old 2. Body weight ≥40 kg 3. Must have "probable" or "definite" diagnosis of PM or DM according to the 2017 ACR/EULAR classification criteria for adult myositis. 4. Moderate or severe disease activity per core set measurements. 5. Currently receiving oral prednisone or other polymyositis or dermatomyositis treatments at a stable dose. 6. No history of active tuberculosis or severe COVID-19. 7. Male and female participants must follow contraception guidelines. Exclusion Criteria: 1. Participants with documented inclusi…
Anifrolumab treatment delivered subcutaneously, once weekly for 52 weeks
Matched placebo delivered subcutaneously, once weekly for 52 weeks
At Week 52, all study participants on anifrolumab or placebo will receive open label anifrolumab once weekly for an additional 52 weeks