We also compared the A20 expression level of different SNPs, it appeared that there was a higher A20 expression level in RA patients with rs2230926 TG genotype and rs146534657 AG genotype (11.56 ± 7.39) than patients with rs2230926 TT genotype and rs146534657 AA genotype (5.63 ± 4.37) (P = 0.031) (Figure 5). This evidence concerns the gene TNFAIP3 and rheumatoid arthritis.