CD40LG and hypertensive disorder: The levels of RF_IgA, RF_IgG, and RF_IgM in RA combined with hypertension group were [35.36 (20.27, 73.27) IU/mL], [20.54 (9.90, 46.57) U/mL], and [15.57 (7.63, 110.89) IU/mL], respectively.