Abstract Objectives Chimeric Antigen Receptor (CAR)-T cell therapy recently emerged as a possible new treatment option in refractory systemic autoimmune diseases (AID). With growing evidence in B-cell mediated AID, the question arises as to its potential application in difficult to treat rheumatoid arthritis (RA). Building on positive experience in a case of overlapping seropositive RA and systemic sclerosis treated with CD19 CAR-T cells at our center, we reviewed the available evidence on the efficacy and safety of CAR-T cell therapy in RA. Methods The patient successfully received a single infusion of autologous CD19 CAR-T cells (KYV-101, Kyverna Therapeutics) after lymphodepletion with fludarabine and cyclophosphamide. Clinical, serologic, and safety outcomes were monitored over 12 months, demonstrating sustained disease remission and improvement in interstitial lung disease. Furthermore, a literature review analyzed prior cases of CAR-T cell treatment in RA, focusing on patient characteristics, outcomes, and adverse events. Results Seven of eight previously published cases of CAR-T cell therapy in RA (7/8 ACPA positive) consistently reported significant improvement, with most patients remained stable off immunosuppressive therapy after a median follow-up of 9 months. High-grade CRS (grade 3) and ICANS (grade 4) was reported only in one patient. No serious infections were observed, even though transient hypogammoglobulinemia occurred in two patients (2/8). Conclusion The eight reported cases highlight the potential of CAR-T cell therapy, even in patients unresponsive to B-cell–targeted treatments in RA. Larger and prospective studies are needed to assess its long-term efficacy and safety in the disease.
Kremer et al. (2026) studied this question.