CSF1 and rheumatoid arthritis: CSF1 and its receptor (CSF1R) play multiple essential roles in the pathogenesis of immune‐mediated inflammatory diseases,13, 14 such as multiple sclerosis (MS), pigmented villonodular synovitis, rheumatoid arthritis (RA), and interstitial lung disease (ILD).15, 16, 17, 18, 19