TNF and rheumatoid arthritis: A recently published review summarised data on various polymorphisms of 12 genes, best studied as predictive factors for the response to RA drug therapy: methotrexate (HLA-G, MTHFR, ABCB1, TNFA, TYMS), leflunomide (CYP1A2, CYP2C19), etanercept (IL10, TNFA ), infliximab (TNFRSF1B, TNFA, FCGR2A/3A), and other drugs [83].