This antibody identifies squamous and transitional cell epithelia, mesothelium, ductal epithelium, and their corresponding carcinomas. In complex epithelia such as normal prostate glands, the basal cells in most cases express CK5, and expression can also be seen in some nonsquamous carcinomas, e.g., pancreatic adenocarcinoma.
• Formalin-fixed, paraffin-embedded (FFPE) tissue block or cell block - OR - • 3 unstained slides for each test requested plus 1-2 additional unstained slides cut at 4µm