title: Primary neuroendocrine (Merkel cell?) carcinoma of the skin. II. An immunocytochemical study of 21 cases.
abstract: Twenty-one examples of neuroendocrine carcinoma of the skin were examined by the unlabeled antibody enzyme method for several neural hormones and peptides, carcinoembryonic antigen, S-100 protein, neuron-specific enolase, and three intermediate filaments: neurofilament, glial fibrillary acidic protein, and cytokeratin. Vasoactive intestinal polypeptide from two sources reacted with the neoplastic cells of four (18%) and seven (32%) of the cases, and pancreatic polypeptide reacted with scattered cells of one case. Neuron-specific enolase reactivity occurred in 50% of the cases. Neurofilament (70, 150, 200 kilodaltons) was strongly positive in 40% of the tumors whereas neurofilament (200 kilodaltons) was negative. Two monoclonal anticytokeratin antibodies of 54 kilodaltons and 44-54 kilodaltons reacted in 77% and 64% of the cases, respectively, in a distribution similar to the neurofilament. Sections reacted with antisera against cytokeratins of higher molecular weight were negative. The demonstration of vasoactive intestinal polypeptide, pancreatic polypeptide, neurofilament, and neuron-specific enolase is evidence of the neuroendocrine nature of this neoplasm.
authors.forename: R K
authors.initials: RK
authors.lastname: Sibley
authors.forename: D
authors.initials: D
authors.lastname: Dahl
mesh_terms: D002277:Carcinoma / Q000378:metabolism* / Q000473:pathology; D000078404:Epidermal Cells; D004817:Epidermis / Q000378:metabolism; D006801:Humans; D007124:Immunoenzyme Techniques; D007381:Intermediate Filament Proteins / Q000032:analysis; D007633:Keratins / Q000032:analysis; D016900:Neurofilament Proteins; D010191:Pancreatic Polypeptide / Q000032:analysis; D010751:Phosphopyruvate Hydratase / Q000032:analysis; D012878:Skin Neoplasms / Q000378:metabolism* / Q000473:pathology; D014660:Vasoactive Intestinal Peptide / Q000032:analysis
chemical_list: D007381:Intermediate Filament Proteins; D016900:Neurofilament Proteins; D014660:Vasoactive Intestinal Peptide; D010191:Pancreatic Polypeptide; D007633:Keratins; D010751:Phosphopyruvate Hydratase