KRT5 and neoplasm: Among tumor cells, the luminal cell was positive for CK7 (3/3,100%) and CK 8/18 (5/5, 100%), and the myoepithelial-basal cell showed positivity for P63 (8/9, 89%), CK5/6 (9/9, 100%), EGFR 8 (5/5, 100%), and S100 (4/6, 67%).