RNPC3 and synovial sarcoma: Anti-dsDNA antibodies = anti-double-stranded deoxyribonucleic acid antibodies; Anti-RNP = anti-ribonucleoprotein antibodies; Anti-Sm = anti-Smith antibodies; Anti-Scl70 antibodies = antiscleroderma-70 antibodies; Anti-SS-A antibodies= anti-Sjogren's syndrome-A antibodies; anti-SS-B antibodies = anti-Sjogren's syndrome-B antibodies; Anti-JO-1 antibodies = anti-histidyl tRNA synthetase antibodies.