Real-time PCR is useful in detecting and distinguishing SYT-SSX1 from SYT-SSX2 gene fusions in synovial sarcoma.     ///    This study was designed to evaluate the utility of a real-time reverse transcriptase-polymerase chain reaction (RT-PCR) assay to detect and distinguish SYT-SSX1 and SYT-SSX2 fusions in fresh and archival specimens of synovial sarcoma in pediatric patients seen at St.     ///    SYT-SSX1 transcripts were found in 18/24 (75%) of the tumors while SYT-SSX2 transcripts were identified in 3/24 (12.5%).     ///    Real-time polymerase chain reaction as an aid for the detection of SYT-SSX1 and SYT-SSX2 transcripts in fresh and archival pediatric synovial sarcoma specimens: report of 25 cases from St.     ///    Positive results for either SYT-SSX1 or SYT-SSX2 were obtained in 21/25 (84%) cases.     ///    "In addition, distinguishing SYT-SSX1 from SYT-SSX2 fusions with these methods allow for prospective collection of information that may clarify issues of prognostic relevance.. "    ///    SYT-SSX2 fusions were compared. 