In the non-SLE autoimmune diseases group, 8 cases (12.9%) were anti-dsDNA IgG isotype positive, 2 cases (3.2%) were IgA positive, 2 cases (3.2%) were IgM positive, and 8 cases (12.9%) were anti-C1q antibody positive. This evidence concerns the gene CD40LG and systemic lupus erythematosus.