background: rheumatoid arthritis (ra) is a chronic, systemic, inflammatory disease with autoimmune etiology, characterized by synovial inflammation and destruction of joint cartilage and bone. there are controversial data about the profile of interleukin-17 (il-17a), interleukin-4 (il-4), and interferon-gamma (infî³), indicating in some studies the key role of il-17, while in others the th1 cyt...
