KRT5 and neoplasm: Thus, they presented with positivity for cytokeratin AE1/AE3, CK5, p63, and high-molecular-weight cytokeratin, with a strong reaction in 80–100% of tumor cells, and membrane epithelial antigen was positive in all cases, with weak-to-moderate immunostaining, while the CD117 reaction were completely negative in the malignant epithelial component.