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Overview
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Cytokeratin 5 is an intermediate filament protein of 58 kD molecular weight within the cytokeratinfamily. It is a type II (basic) cytokeratin. Antibodies to this protein identify basal cells of squamous andglandular epithelia, myoepithelia, and mesothelium. Anti-cytokeratin 5 has been reported useful in thedifferential diagnosis of metastatic carcinoma in the pleura versus epithelioid mesothelioma.Epithelioid mesotheliomas are strongly positive in almost all cases, but a minority of pulmonaryadenocarcinomas will show focal immunoreactivity. Almost all squamous cell carcinomas, half oftransitional carcinomas, and many undifferentiated large cell carcinomas immunostain with anti-CK 5.Anti-CK 5, along with anti-p63, affords a high sensitivity and specificity for squamous differentiation.Myoepithelial cells of the breast, glandular epithelia, and basal cells of the prostate are labeled withanti-CK. This antibody, along with anti-CK 14, has found application in identifying basal-like breastcarcinoma.
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Overview