SOAT1 and rheumatoid arthritis: KEGG analysis25–27 showed that the DEIRGs were enriched in cytokine-cytokine receptor interaction, viral protein interaction with cytokines and cytokine receptors, neuroactive ligand-receptor interaction, chemokine signal pathway, JAK-STAT signal pathway, IL-17 signal pathway, rheumatoid arthritis and complement and coagulation cascade (Fig. 1D, Table S5).