IL37 and rheumatoid arthritis: Previous clinical studies have implicated that IL-37 SNP rs3811047 associated with the susceptibility to gastric cardiac adenocarcinoma [22], autoimmune diseases including autoimmune thyroid disease (AITD) [23], ankylosing spondylitis (AS) [24] and disease activity of rheumatoid arthritis (RA) [25,26].