IL17A and rheumatoid arthritis: In terms of inflammatory cytokines, ITIH4 was negatively linked with TNF‐α (rs = −0.337, p = 0.001), IL‐6 (rs = −0.221, p = 0.033), and IL‐17A (rs = −0.368, p < 0.001) in RA patients, but not correlated with IL‐1β (rs = −0.195, p = 0.061) (Figure 3A‐D).