RNPC3 and systemic lupus erythematosus: Another caveat is that we also did not search for autoantibodies of systemic autoimmune diseases, such as anti-dsDNA (double-stranded desoxyribonucleic acid), anti-Sm [protein complexed to six species of nuclear U1 ribonucleic acid (RNA)], anti-RNP (protein complexed to U1 RNA), etc., typical antibodies for systemic lupus erythematosus or other autoantibodies related to rheumatologic autoimmune diseases.