This study is testing a new treatment called ianalumab for people with Systemic Lupus Erythematosus (SLE), which is a disease where the body's immune system attacks its own tissues. The study will compare the effects of ianalumab, given as a shot under the skin every month, to a placebo (a fake treatment), while participants continue their usual treatments. The study is double-blind, meaning neither the participants nor the researchers know who is getting the real treatment.

• The study involves regular monthly visits to receive the injection.
• Participants must be at least 12 years old, with some restrictions in certain countries.
• Participants should not have received certain medications recently and must not have serious infections or organ problems.

This research aims to see if ianalumab is safe, effective, and how well people can tolerate it. If you're considering joining, think about the monthly visits and any potential risks mentioned above. Discuss with your doctor if this study might be right for you, especially if you meet the eligibility criteria and are interested in trying a new treatment for SLE.