STAT3 and rheumatoid arthritis: Compared with the blank and NC groups, the paw thickness and the degree of swelling in RA rats were ameliorated in the let‐7c‐5p agomir and sh‐lncRNA XIST groups, but were aggravated in the let‐7c‐5p antagomir and oe‐STAT3 groups (both P < .05).