SMAD3 and rheumatoid arthritis: We found that the expression of miR-26 was positively correlated with SMAD3 (r = 0.78, p = 0.002), STAT3 (r = 0.63, p=0.02), and SOCS1 (r = 0.74, p = 0.005) expression, and expression of miR-155 was positively correlated with STAT3 expression (r = 0.67, p = 0.012) in Th17 cells from patients with RA (Figure 2).