Serum CXCR3 levels were 3.27 ± 1.32 ng/mL for pSS, 3.29 ± 1.17 ng/mL for RA, and 2.00 ± 1.12 ng/mL for HCs, with significant differences between the three groups (p < 0.001), as well as between pSS and HCs (p < 0.001). Here, CXCR3 is linked to rheumatoid arthritis.