Immunohistochemical results: P504S (+), CK7 (-), CK20 (-), CD15 (a few +), RCC (+), CD10 (part + Vimentin (+), PAX - 8 + (part), EMA (in +), CD117 focal (+), Ki - 67 index (5%),Colloidal iron staining (-). Here, KIT is linked to renal cell carcinoma.