IL6 and rheumatoid arthritis: The most explored reagents that can neutralize IL-6 activity are the humanized monoclonal antibody (mAb) tocilizumab, and the fully human mAb sarilumab, which have previously shown benefits in patients with various rheumatic diseases, such as rheumatoid arthritis (RA), juvenile idiopathic arthritis (JIA), and adult-onset Still’s disease (AOSD) (58).