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JOURNAL ARTICLE
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Bilateral apocrine carcinoma of the breast. Molecular and immunocytochemical evidence for two independent primary tumours.
Virchows Archiv : An International Journal of Pathology 1998 December
Apocrine carcinoma is an uncommon variant of breast cancer. The frequency of bilaterality in patients who have apocrine carcinoma in one breast is not significantly different from that for bilateral mammary carcinomas in general, but bilateral apocrine carcinomas are very uncommon. We report on a bilateral apocrine carcinoma of the breast in a 74-year-old woman. The apocrine differentiation in both tumours was confirmed by the positivity of the cytoplasmic granules for PAS after diastase digestion and immunoreactivity for GCDFP-15 and sialyl-Tn. The tumour in the right breast showed immunohistochemical expression of p53, and a mutation was demonstrated by PCR-SSCP; the tumour in the left breast was negative for p53 on immunohistochemistry, and no mutation was found at the molecular level. c-erbB2 expression was not detected in the right tumour but there was overexpression (at the cell membrane) in the left tumour. Both tumours were aneuploid: the right tumour displayed multiple stemlines, whereas the left tumour had a triploid profile. Using the fluorescence in situ hybridization technique we demonstrated that both tumours displayed chromosome 17 polysomy and numerical abnormalities of chromosome 1, polysomy in the right and monosomy in the left tumour. We conclude that the two tumours are probably independent, as are most bilateral carcinomas of the breast.
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