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Keratin, type II cytoskeletal 7 also known as cytokeratin-7 (CK-7) or keratin-7 (K7) or sarcolectin (SCL) is a protein that in humans is encoded by the KRT7 gene. [5] [6] [7] Keratin 7 is a type II keratin. It is specifically expressed in the simple epithelia lining the cavities of the internal organs and in the gland ducts and blood vessels.
Cytokeratin 7: A subgroup of glandular epithelia and their tumors [6] Transitional epithelium and transitional carcinoma [6] Cytokeratin 8: Glandular epithelia of the digestive, respiratory and urogenital tracts, both endocrine and exocrine cells, as well as mesothelial cells; Adenocarcinomas originating from those above [6] Cytokeratin 10
SGc tumor cells stain positive with epithelial membrane antigen (EMA), cytokeratin -7 (CK-7), Ber-EP4, adipophilin, perilipin, and androgen receptor (AR). [6] [17] [2] Meanwhile, SGc cells are negative for carcinoembryonic antigen (CEA), gross cystic disease fluid protein, and S100 protein, helping differentiate SGc from SCC and BCC.
- The right panel shows high magnification on a positive area, confirming adenocarcinoma, as it shows tumor cells with large nuclei and prominent nucleoli. AE1/AE3 is an antibody cocktail that is used in immunohistochemistry , being generally positive in the cytoplasm of carcinomas (cancers of epithelial origin).
Cyclin D1 and CK5/6 staining could be used in concert to distinguish between the diagnosis of papilloma (Cyclin D1 < 4.20%, CK 5/6 positive) or papillary carcinoma (Cyclin D1 > 37.00%, CK 5/6 negative). [2] In the lung, distinguishing epithelioid mesothelioma (CK5/6 positive in 83%) from lung adenocarcinoma (CK5/6 negative in 85%). [1]
An ideal tumor marker does not exist, and how they are clinically applied depends on the specific tumor marker. For example, tumor markers like Ki-67 can be used to choose form of treatment or in prognostics but are not useful to give a diagnosis, while other tumor markers have the opposite functionality. Therefore it's important to follow the ...
A case of a brain metastasis from a giant-cell lung carcinoma (both "pure") tested positive for cytokeratins AE1/AE3, and negative for CK-7, CK-20, TTF-1, and GFAP. [18] GCCL cells often stain intensely by Periodic acid-Schiff reagent, suggesting the presence of significant amounts of glycogen in the cell cytoplasm. [15]
It is a rare type of skin cancer, with a 2013 incidence of only 0.7 per 100,000 persons in the U.S. [56] As of 2005, roughly 2,500 new cases of MCC are diagnosed each year in the United States, [56] as compared to around 60,000 new cases of malignant melanoma and over 1 million new cases of nonmelanoma skin cancer. [57]