CD40LG and systemic lupus erythematosus: The low levels of IgM anti-C1-INH367–385 (odds ratio [OR] = 4.725, p < 0.001), IgM anti-C1-INH367–385 Ac (OR = 4.089, p = 0.001), and IgA anti-C1-INH367–385 Ac (OR = 5.566, p < 0.001) indicated increased risks for the development of SLE compared with HCs.