In combination with other established methods, accurate reverse transcriptase-polymerase chain reaction analysis of JAZF1/JJAZ1 gene fusion may be useful in diagnosing difficult or unusual ESS/UES cases..     ///    JAZF1/JJAZ1 gene fusion in endometrial stromal sarcomas: molecular analysis by reverse transcriptase-polymerase chain reaction optimized for paraffin-embedded tissue..     ///    "In comparison to published data, our results identified the JAZF1/JJAZ1 gene fusion more frequently in endometrial stromal tumors than hitherto presumed. "    ///    "In our subset of samples, the JAZF1/JJAZ1 fusion transcript occurred in 80% of analyzed ESS cases and in none of two UES cases. "    ///    "Hitherto only 31 cases, described by three different research groups, have shown JAZF1/JJAZ1 fusion in approximately 50% of all analyzed low-grade ESSs whereas it is less frequent in UESs. "