Since the established cells showed spindle‐shaped morphology with atypical nuclei, and since immunohistochemistry revealed that they were positive for α‐SMA but negative for KIT, CD34 and desmin, the phenotypes of the cells were reminiscent of dedifferentiated GIST‐like ones but not the usual GIST‐like ones. Here, DES is linked to gastrointestinal stromal tumor.