IL37 and rheumatoid arthritis: IL-37, formerly named IL-1F7, downregulated the expression of pro-inflammatory cytokines in various inflammatory diseases [11], such as ankylosing spondylitis (AS), systemic lupus erythematosus (SLE), rheumatoid arthritis (RA), and adult-onset Still’s disease (AOSD) [12–16], then relieving the inflammatory responses in sJIA.