The purpose of this study is to evaluate long-term safety and tolerability of ianalumab in participants with systemic lupus erythematosus who have previously completed the treatment period in one of the two SIRIUS-SLE core studies (CVAY736F12301 or CVAY736F12302).

The purpose of this extension study is to evaluate long-term safety and tolerability of ianalumab administered s.c. monthly or quarterly, compared to monthly placebo, in adolescent and adult participants with anti-nuclear antibody (ANA)-positive systemic lupus erythematosus of moderate-to-severe disease activity, who have completed either CVAY736F12301 (SIRIUS-SLE 1) or CVAY736F12302 (SIRIUS-SLE 2) core studies.

Key Inclusion Criteria:

• Signed informed consent prior to participation in the extension study. Parent or legal guardian's signed informed consent and child's assent, if appropriate, are required before any assessment is performed for participants <18 years of age. Of note, if the participant reaches age of consent (age as per local law) during the study, they will also need to sign the corresponding study Informed Consent Form (ICF) at the next study visit.
• Participants must have participated in either one of the two SIRIUS-SLE core studies, CVAY736F12301 or CVAY736F12302, and have completed the treatment period through Week 60 without treatment discontinuation.
• In the judgement of the investigator, participants must be expected to clinically benefit from continued study treatment.

Key Exclusion Criteria:

• Use of prohibited therapies.
• Active viral, bacterial or other infections requiring intravenous or intramuscular treatment for clinically significant infection which in the opinion of the investigator will place the participant at risk for participation.
• Plans for administration of live vaccines during the study period.
• Pregnant or nursing (lactating) women.
• Women of child-bearing potential, defined as all women physiologically capable of becoming pregnant, refusing or unable to use highly effective methods of contraception while on study treatment and for 6 months after stopping of study drug (or longer if required by concomitant medications).
• United States (and other countries, if locally required): sexually active males, unless they agree to use barrier protection during intercourse with women of child-bearing potential while taking study treatment.

Other protocol-defined inclusion/exclusion criteria may apply.

Novartis is committed to sharing access to patient-level data and supporting clinical documents from eligible studies with qualified external researchers. Requests are reviewed and approved by an independent review panel on the basis of scientific merit. All data provided is anonymized to protect the privacy of patients who have participated in the trial in line with applicable laws and regulations.

This trial data availability is according to the criteria and process described on www.clinicalstudydatarequest.com