Study Evaluating Safety, Tolerability, PK/PD of Surovatamig in Adult RA or SLE Participants

This study is testing a new drug called surovatamig in adults with either rheumatoid arthritis (RA) or lupus (SLE) — both are autoimmune conditions where the immune system mistakenly attacks the body's own tissues. The goal is to evaluate safety, tolerability, and early signs of effectiveness. **You may be eligible if...** - You are 18–65 years old with a confirmed diagnosis of RA or lupus - For RA: you have moderate to severe disease activity, positive autoantibodies (RF or ACPA), and have not responded well to at least 2 different biologic or targeted therapies - For lupus: you have active disease despite prior treatment **You may NOT be eligible if...** - You have serious infections or immunodeficiency - You have significant organ damage that would make the study drug unsafe - You are pregnant or planning to become pregnant during the study Talk to your doctor to see if this trial is right for you.