This study is for adults aged 18 to 75 with severe autoimmune diseases like systemic lupus erythematosus (SLE) and anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV). In these diseases, the immune system attacks the body's own cells. The study tests a new treatment called SC291 to see if it's safe and works well. Patients will get a single dose of SC291 after they take medicines called cyclophosphamide (CY) and fludarabine (FLU) to prepare. Candidates for the study must not have had previous treatments that change cells, like CAR T therapy.
- The study includes a single dose of SC291.
- Participants should not have had certain previous cell therapies.
- Study targets severe cases that didn't respond to other treatments.