An Exploratory Clinical Study of CD19 CAR NK Cells for the Treatment of Refractory Antisynthetase Antibody Syndrome and Rheumatoid Arthritis

This study is a single-arm, open-label and single-center exploratory clinical study to evaluate the safety and effectiveness of anti CD19 CAR NK cells in patients with refractory antisynthetase antibody syndrome (ASyS) and rheumatoid arthritis (RA). All subjects will receive fludarabine/cyclophosphamide lymphodepletion followed by Anti-CD19 CAR NK cells infusion.