SSX1 and synovial sarcoma: The precise etiology of synovial sarcoma remains unclear [4,5], however, a characteristic SYT-SSX fusion gene, which results from a t(X;18) translocation and represents a fusion of SYT (at 18q11) with SSX1, SSX2 or SSX4 (at Xp11), can be detected in more than 90% of synovial sarcomas [6].