KIT and platelet-derived growth factor receptor α wild-type gastrointestinal stromal tumor associated with neurofibromatosis type 1: Two case reports

Figure 3 Microscopic and immunohistochemical features of multiple nodules from the skin. A, B: Tumor composed of spindle cells with eosinophilic cytoplasm (A: × 100; B: × 200, hematoxylin-eosin staining); C: Positive for CD34 [3,3’-Diaminobenzidine (DAB) staining]; D: Positive for S-100 (DAB staining); E: Positive for VIM (DAB staining); F: Negative for CK (DAB staining); G: Negative for EMA (DAB staining); H: Negative for SMA (DAB staining); I: Negative for desmin (DAB staining); J: The percentage of Ki67 positive cells was approximately 2% (DAB staining).