Breast cancer - Strong diffuse Cytokeratin 18 positivity in a breast cancer NST.

Cervical cancer - Adenocarcinoma of the cervix uteri with intense Cytokeratin 18 positivity.

Colorectal cancer - Adenocarcinoma of the colon with strong Cytokeratin 18 immunostaining.

Head and neck cancer - CK 18 negative squamous cell carcinoma of the larynx. Normal glandular cells serve as a positive staining control.

Kidney cancer - Strong Cytokeratin 18 immunostaining in chromophobe renal cell carcinoma.

Ovarian cancer - Strong Cytokeratin 18 immunostaining in a high grade serous carcinoma of the ovary.

Sarcoma - Weak to moderate Cytokeratin 18 neo-expression in a sarcoma NOS.

Stomach cancer - strong diffuse Cytokeratin 18 expression in an intestinal type stomach adenocarcinoma.

Testicular cancer - Yolk sac carcinoma with strong Cytokeratin 18 immunostaining.

Urinary bladder cancer - Strong diffuse Cytokeratin 18 expression in a muscle-invasive urothelial carcinoma.

Urinary bladder cancer - Strong diffuse Cytokeratin 18 immunostaining in a (micropapillary) urothelial carcinoma.

Vaginal cancer - Absence of Cytokeratin 18 immunostaining in a squamous cell carcinoma of the vagina.