 SS18-SSX (formerly called SYT-SSX) fusion gene has been established clinically as a molecular diagnostic test for synovial sarcoma, but the prognostic value of the fusion gene variant for survival is controversial.     ///    Prognostic value of SS18-SSX fusion type in synovial sarcoma.     ///    The objective of this systematic review is to provide an up-to-date and unprecedented summary of the prognostic impact of SS18-SSX fusion type in synovial sarcoma.     ///    "Studies evaluating SS18-SSX fusion type as a prognostic marker in synovial sarcoma were systematically searched for in MEDLINE, EMBASE, and Web of Science. "