However, significant differences in EAD IgG and EAD IgA levels were seen between RA patients and HCs, between SLE patients and HCs, and between RA patients and SLE patients (P values of 0.0011, <0.0001, and <0.0001, resp., for EAD IgG and P values of 0.0016, <0.0001, and 0.0056, resp., for EAD IgA) (Figure 1(a)). Here, CD79A is linked to systemic lupus erythematosus.