Anorectum - Squamous cell carcinoma with moderate to strong Cytokeratin 13 positivity of suprabasal cells.

Colon - Cytokeratin 13 negative colorectal adenocarcinoma.

Esophgus - Squamous cell carcinoma with strong diffuse Cytokeratin 13 positivity.

Kidney - Cytokeratin 13 negative clear cell renal cell carcinoma.

Larynx - Squamous cell carcinoma with intense Cytokeratin 13 positivity of suprabasal cells.

Lung - Cytokeratin 13 negative adenocarcinoma.

Lung - Squamous cell carcinoma with intense Cytokeratin 13 positivity of all cells. Cytokeratin 13 staining intensity increases from the basal cell layers to the center of invasive tumor cell nests.

Ovary - Brenner tumor with strong Cytokeratin 13 positivity of urothelial cells.

Penis - Squamous cell carcinoma exhibiting a strong diffuse Cytokeratin 13 positivity of all tumor cells.

Pleura - Cytokeratin 13 negative malignant mesothelioma.

Prostate - Cytokeratin 13 negative prostatic adenocarcinoma (Gleason 3+3=6).

Salivary gland - Warthin tumor showing intense Cytokeratin 13 positivity of a small fraction of (suprabasal) cells.

Skin - Cytokeratin 13 negative basal cell carcinoma.

Skin - Squamous cell carcinoma with scattered Cytokeratin 13 positive cells showing variable levels of expression (mosaic pattern).

Thyroid - Cytokeratin 13 negative papillary carcinoma.

Urinary bladder - Non-invasive papillary urothelial carcinoma (pTa) showing strong diffuse Cytokeratin 13 positivity.

Urinary bladder - Strong Cytokeratin 13 immunostaining in a muscle-invasive urothelial carcinoma.

Uterine cervix - Squamous cell carcinoma showing strong Cytokeratin 13 expression of suprabasal cells.

Vulva - Squamous cell carcinoma with intense Cytokeratin 13 immunostaining of all cells.