This is a Phase 3, multicentre, multinational, randomised, double-blind, placebo-controlled study to evaluate the efficacy and safety of an intravenous treatment regimen of anifrolumab versus placebo in participants with moderately to severely active, autoantibody-positive systemic lupus erythematosus (SLE) while receiving standard of care (SOC) treatment. Participants must be taking either 1 or any combination of the following: oral corticosteroids (OCS), antimalarial, and/or immunosuppressants. The study will be performed in adult participants aged 18 to 70 years of age.~Approximately 360 participants receiving SOC treatment will be randomised in a 1:1 ratio to receive a fixed intravenous dose of anifrolumab 300 mg or placebo every 4 weeks for a total of 13 doses (Week 0 to Week 48), with the primary endpoint evaluated at the Week 52 visit. Investigational product will be administered as an intravenous infusion (IV) via an infusion pump over a minimum of 30 minutes, every 4 weeks.
The purpose of this study is to evaluate the efficacy and safety of an intravenous treatment regimen of anifrolumab versus placebo in adult participants with moderately to severely active, autoantibody-positive systemic lupus erythematosus (SLE).