Intraepidermal cells of Paget's carcinoma of the breast can be genetically different from those of the underlying carcinoma.

Abstract excerpt

Paget's carcinoma (PC) of the breast is characterized by neoplastic cells of "glandular" type located within the epidermis of the nipple-areolar complex, often associated with an underlying ductal carcinoma, either in situ or invasive. At present the origin of PC cells is controversial, although there is a widespread opinion that PC cells are "foreign" elements to the epidermis resulting from an epidermotropic...

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