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Salivary Duct Carcinoma: New Developments—Morphological Variants Including Pure In Situ High Grade Lesions; Proposed Molecular Classification

  • Invited Review: An Update on Salivary Gland Pathology
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Abstract

Salivary duct carcinoma (SDC) is an aggressive primary salivary malignancy which microscopically resembles high-grade ductal carcinoma of the breast, with both in situ and invasive patterns. It is typically found in older men, most often in the parotid. It can arise de novo or as the malignant component of carcinoma ex pleomorphic adenoma. SDC is generally a hematoxylin and eosin stain-based diagnosis, with special stains and immunohistochemistry acting mainly in a confirmatory role. Other than epithelial markers, SDC expresses androgen receptors in most cases, with true HER2 positivity seen in about 15 %. Based on these data and analogous to similar schemes in the breast, it is suggested that SDCs can be classified into three main groups: luminal androgen receptor positive, HER2+ and basal phenotype. This may form the basis for prognostic information and new therapeutic possibilities. In addition to the usual type of SDC, a few less common morphological variants have been reported: papillary, micropapillary, mucin-rich, sarcomatoid and oncocytic, as well as pure in situ cases.

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Simpson, R.H.W. Salivary Duct Carcinoma: New Developments—Morphological Variants Including Pure In Situ High Grade Lesions; Proposed Molecular Classification. Head and Neck Pathol 7 (Suppl 1), 48–58 (2013). https://doi.org/10.1007/s12105-013-0456-x

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