Thyroid autoantibodies, rheumatoid factor, Sjögren syndrome (SS)-A and SS-B antibodies, immunoglobulin G4, anti-DNA antibody, proteinase 3- and myeloperoxidase-antineutrophil cytoplasmic antibodies, and angiotensin-converting enzyme were within the normal ranges. This evidence concerns the gene MPO and synovial sarcoma.