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American Journal of Pathology, Vol 123, 532-541, Copyright © 1986 by American Society for Investigative Pathology

REGULAR ARTICLES

Apocrine carcinoma of the breast. A morphologic and immunocytochemical study [published erratum appears in Am J Pathol 1986 Sep;124(3):following 563]

V Eusebi, RR Millis, MG Cattani, G Bussolati and JG Azzopardi

The mode of recognition and hence the frequency of apocrine differentiation in breast carcinomas, assessed on purely morphologic grounds, remains uncertain. One hundred consecutive cases of breast carcinoma were studied in order to establish the incidence of this type of tumor. With the use of an immunocytochemical method for the detection of GCDFP-15, a protein present in apocrine epithelium and in the fluid of tension cyst of the breast, the presence of apocrine differentiation was confirmed in 4 cases initially diagnosed as apocrine carcinomas on histologic grounds. Eight additional cases contained immunoreactive cells: 1 contained 10% of positive cells scattered throughout the tumor, and the other 7 cases were only focally positive. In 4 of these latter cases positive staining was confined to the in situ component. The ultrastructural findings in 2 cases of apocrine carcinoma are discussed in order to link the morphologic features for recognizing this tumor type and the presence of the antigenic apocrine marker.

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