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We report a rare case in which two tumor entities, a gastrointestinal stromal tumor (GIST) and Ewing sarcoma/primitive neuroectodermal tumor (ES/PNET), with distinct cytogenetic features occurred in a single patient. The patient was a 72-year-old woman. The first tumor was a submucosal gastric tumor and was diagnosed as a low-risk group GIST based on morphological characteristics and the results of an immunohistochemical analysis for c-kit and CD34. Further cytogenetic analysis revealed thatdoi:10.1093/jjco/hyi197 pmid:16332719 fatcat:wt6eh5aj45b7xnhdjvpej3zgha