SSB and synovial sarcoma: They found that MxA levels correlated with the European League Against Rheumatism (EULAR) SS disease activity index (ESSDAI) scores and clinical laboratory profiles such as the levels of immunoglobulin (IgG, IgA, and IgM) and autoantibody (anti-Ro/SSA, anti-La/SSB, and rheumatoid factor).