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Our study was designed to investigate the frequency of PTEN\/MMAC1 gene mutation and to evaluate the role of the PTEN\/MMAC1 gene in the tumorigenesis of soft tissue sarcomas without specific balanced translocations. We analyzed 51 cases of soft tissue sarcomas without specific balanced translocations for PTEN\/MMAC1 mutations by polymerase chain reaction\u2010single strand conformation polymorphism and direct sequencing. Mutations in the PTEN\/MMAC1 gene were found in only 2 cases (3.9%). Both tumors with PTEN\/MMAC1 mutation were leiomyosarcomas arising from the retroperitoneum and inferior vena cava, respectively. Two of 3 leiomyosarcomas arising from the intra\u2010abdominal cavity examined harbored mutations of this tumor suppressor gene. This result suggests that leiomyosarcomas derived from the intra\u2010abdominal cavity might have different tumorigenesis from those of an extremity or the trunk, from the viewpoint of PTEN\/MMAC1 mutation, although PTEN\/MMAC1 gene mutations are rare event in these soft tissue sarcomas. \u00a9 2003 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/ijc.10918","type":"journal-article","created":{"date-parts":[[2003,2,6]],"date-time":"2003-02-06T01:48:03Z","timestamp":1044496083000},"page":"175-178","source":"Crossref","is-referenced-by-count":22,"title":["PTEN\/MMAC1 gene mutation is a rare event in soft tissue sarcomas without specific balanced 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