Next, we compared the frequencies of Th1/Tc1, t-Th17/t-Tc17, and Th17/Tc17 cells in paired SF and PB samples from individual patients (n = 4 pairs in PD-1 inhibitor arthritis, n = 4 pairs in combined ICI arthritis) (Fig. 5c). Here, PDCD1 is linked to Arthritis.