Long-term Safety and Tolerability of Cenerimod in Adults With Systemic Lupus Erythematosus

Inclusion Criteria: 1. Signed and dated informed consent form prior to any study-mandated procedure. 2. Participants with a diagnosis of systemic lupus erythematosus who: * Completed the 12-month double-blind treatment period of either of the parent studies (ID-064A301, ID-064A302). * Did not meet any study treatment stopping criteria during the parent study. * Completed the last scheduled visit of the parent study. Participants who did not complete the last scheduled visit for reasons beyond their control may be eligible for this study upon approval by the sponsor. 3. Women of child-bearing potential: * Negative pregnancy test at Visit 1. * Agreement to undertake monthly urine pregnancy tests from Visit 2 up to 6 months after study treatment discontinuation. * Agreement to use a highly effective method of contraception from Visit 1 up to 6 months after study treatment discontinuation. Exclusion Criteria: 1. Poor compliance with study-mandated procedures during the parent study (ID-064A301 or ID-064A302), e.g., took less than 80% of the planned doses of double-blind study treatment; or did not attend a majority of the site visits, unless there was a medically justified reason as judged by the investigator. 2. Systemic lupus erythematosus driven renal disease, central nervous system lupus, or active severe or unstable neuropsychiatric systemic lupus erythematosus where, in the judgment of the investigator, protocol-specific systemic lupus erythematosus background therapy is insufficient, and the use of a more aggressive therapeutic approach or other treatments not permitted in the protocol is indicated. 3. Women of child-bearing potential planning to become pregnant up to the final study visit. 4. Judged not eligible to participate by the investigator, for any other reason. 5. Confirmed active or latent tuberculosis (applicable only if requested by local regulations).