CD79A and rheumatoid arthritis: The levels of RF_IgA, RF_IgG, and RF_IgM in non-DM RA patients were [41.25 (24.57, 79.89) IU/mL], [24.56 (10.25, 68.95) U/mL], and [89.48 (7.78, 147.43) IU/mL], respectively.