Various autoantibodies such as anti-Ro/SS-A and anti-La/SS-B antibodies are produced in SS [6,7], and the pathogenesis of SS was thought to center on immune abnormalities according to the activation of acquired immunity and tissue damage caused by the infiltration of mononuclear cells, mainly CD4-positive T cells [8]. The gene discussed is CD4; the disease is synovial sarcoma.