STAT2 and rheumatoid arthritis: ELISA results showed that PBMC IFIT3 (Figure S3A; mean SLE 57ng/mL, mean RA 42ng/mL, P = 0.002), MX1 (Figure S3B; mean SLE 117ng/mL, mean RA 83ng/mL, P = 0.003), TOMM40 (Figure S3C; mean SLE 56ng/mL, mean RA 35ng/mL, P < 0.0001), STAT1 (Figure S3D, mean SLE 5,412pg/mL, mean RA 3,634pg/mL, P = 0.0004), and STAT2 (Figure S3E; mean SLE 2.4ng/mL, mean RA 1.2ng/mL, P = 0.002), and OAS3 (Figure S3F, mean SLE 1,214 nmol/L, mean RA 847 nnmol/L, P = 0.006) levels were significantly upregulated in SLE patients compared to those in RA patients.