Characteristics of PD‐1+CD4+ T cells in peripheral blood and synovium of rheumatoid arthritis patients

This study highlights the increased proportion of PD-1⁺CD4⁺ T cells and elevated sPD-1 levels in RA. The transcriptomic profiles and signalling networks of PD-1⁺CD4⁺ T cells offer new insights into their role in RA pathogenesis.