An Clinical Study of YTS109 Cell Injection in Subjects With Recurrent/Refractory Autoimmune Disease

This study tests an experimental cell therapy called YTS109 — a type of engineered immune cell (CAR-T cell) — for patients with autoimmune diseases (like lupus or rheumatoid arthritis) that have not responded to standard treatments. **You may be eligible if...** - You are between 18 and 65 years old - You have a confirmed autoimmune disease that has not responded to standard therapy - Your B cells (immune cells) test positive for a marker called CD19 - Your blood counts, liver, kidney, heart, and clotting functions are within acceptable ranges - You are willing to use contraception if able to have children **You may NOT be eligible if...** - You are outside the 18-65 age range - Your organ functions are too impaired for the treatment - You are pregnant or breastfeeding - You are unwilling or unable to meet the study requirements Talk to your doctor to see if this trial is right for you.