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Endoscopic submucosal excision performed. A: Histopathological examination of the tumor in case 1 showed spindle-shaped cells arranged in bundles; B: Immunochemical analysis revealed no staining with CD117; C: Focal positivity with CD34; D: Positive staining with S100; E: DOG-1; F: The mitotic activity was 3 mitosis/50 high-power field on Ki-67 staining.
