Abstract
Upon reexamination of about 4000 [human] breast cancer biopsies, 3 pure primary squamous cell carcinomas (SCC) were found. The light microscopic and EM findings of these cases are described. The carcinomas seemed to originate from the glandular tissue of the breast and followed an extremely aggressive clinical course. SCC must be regarded as a separate entity distinct from adenocarcinoma of the breast with squamous cell metaplasia.

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