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  • Title: Coexpression of glial fibrillary acid protein, keratin and vimentin. A unique feature useful in the diagnosis of pleomorphic adenoma of the salivary gland in fine needle aspiration biopsy smears.
    Author: Domagala W, Halczy-Kowalik L, Weber K, Osborn M.
    Journal: Acta Cytol; 1988; 32(3):403-8. PubMed ID: 2453985.
    Abstract:
    Positive staining for glial fibrillary acidic protein (GFAP) of tumor cells in fine needle aspirates of 11 of 12 pleomorphic adenomas of the parotid gland is reported. Tumor cells in these neoplasms also coexpressed keratin and vimentin to varying extents. Coexpression of GFAP, keratin and vimentin in tumor cells in aspirates is an unusual feature, so far demonstrated only in pleomorphic adenomas. Thus, intermediate filament typing may help to distinguish: (1) pleomorphic adenomas of the salivary glands from head and neck tumors of nonsalivary gland origin; (2) intracranial metastases of malignant mixed tumors of the salivary gland from gliomas; and (3) pleomorphic adenomas from extracranial gliomas.
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