As shown in Supplementary Fig. 2, the BR3+/CD14+ ratio in pSS was significantly higher than those in SLE (untreated, 22.7 ± 21.8%, p = 0.0032) and RA (untreated, 19.9 ± 15.8%, p = 0.0018). Here, TNFRSF13C is linked to rheumatoid arthritis.