IL10 and immunoglobulin G4-related sclerosing disease: Serum levels of IL-10 in patients with IgG4-RD (10.67 ± 5.50 pg/mL) were significantly higher than those in HC (3.22 ± 1.40 pg/mL; P <0.001), and there were no significant differences between IgG4-RD and pSS patients (11.59 ± 7.90 pg/mL; Figure 5E).