IFNGR2 and rheumatoid arthritis: In Mendelian randomization, the expression of IFNGR2 (beta=− 0.12, SE=0.02, PIVW= 7.78E − 12) and IFNAR2 (beta=− 0.08, SE=0.03, PIVW=0.004) in blood cells were negatively associated with the risk of rheumatoid arthritis.