CD40LG and systemic lupus erythematosus: The titer of anti-EA (D) IgM, the presence of anti-EA (D) IgM, and the level of rheumatoid factor were potential, while the titer value of anti-EA (D) IgM was an independent predictor of remission and LLDAS in SLE patients with active mucocutaneous manifestations at enrollment (RR = 2.694, 95% CI RR = 1.04–7.01, p = 0.042).