Cytokeratin expression in mucinous sweat gland carcinomas: an immunohistochemical analysis of four cases

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Abstract
Four mucinous sweat gland carcinomas were examined for the distribution of cytokeratin (CK) polypeptides using immunohistochemical techniques on paraffin-embedded sections. All the tumour specimens reacted with monoclonal antibodies to CK 7, CK 8, CK 18 and CK 19. Antibodies to CK 1, CK 1/2/10/14, CK 1/5/10/11, CK 13, CK 14 and CK 20 did not stain any of the carcinomas. The results add additional support to the notion that mucinous sweat gland carcinoma represents a tumour histogenetically related to the eccrine secretory coil. Furthermore, the absence of CK 20 might significantly contribute to the differentiation of this tumour from cutaneous metastases from gastrointestinal carcinomas.