NFKB1 and rheumatoid arthritis: The aim of the present study was to analyze potential associations between NFkB1 (rs28362491, ins/del ATTG) and miR-146a-3p (rs2910164, G > C) polymorphisms and miR-146a-5p expression in patients’ sera in relation to clinical outcome of the treatment as well as predisposition to RA.