STAT3 and rheumatoid arthritis: The expression level of phosphorylation of STAT3 in Monocytes of RA showed lower than SLE and HD (SLE 10.25±0.5551, RA 6.946±0.4587, HD 8.648±0.3694, SLE vs HD P<0.05, SLE vs RA, P<0.01, RA vs HD, P<0.01, Figure 1B, Revised Figure 2B).