JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Neurofilament immunoreactivity in Merkel-cell tumors: a differentiating feature from small-cell carcinoma.

Modern Pathology 1993 January
To differentiate Merkel-cell tumor (MCT) from other neuroendocrine (NE) carcinomas, we immunostained (using avidin-biotin-peroxidase method) nine MCT and 37 NE (including 28 small-cell) carcinomas for NE markers (neuron-specific enolase and chromogranin), cytokeratin, neurofilament, vimentin, and a number of other markers. Cytokeratin was positive in 100% of MCT and in 85% of small-cell carcinomas; neurofilament and vimentin were positive in respectively 100% and 22% of MCT and 0% of NE carcinomas. Our data suggest that the coexpression of cytokeratin and neurofilament by an undifferentiated dermal or visceral tumor is of significant help in diagnosing MCT and differentiating it from small-cell carcinomas. The vimentin reactivity is a weak and insignificant discriminant.

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