Clinical Study to Investigate the Biological Activity, Safety, Tolerability, and Pharmacokinetics of ACT-334441 in Subjects With Systemic Lupus Erythematosus

This multicentre, double-blind, placebo-controlled study will have a staggered approach (Part A and B).

In part A, eligible patients will be randomly assigned (1:1:1:1) to once daily oral administration of cenerimod (0.5, 1, 2 mg) or placebo. After all patients have completed 4 weeks of treatment during part A, an Independent Data Monitoring Committee will review non-blinded data in an interim analysis to evaluate the safety profile of cenerimod and recommend whether the study could proceed to part B.

In part B, additional patients will be randomized (3:1) to once daily oral administration of cenerimod 4 mg or placebo.

All participants will receive study medication for 12 weeks.