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Mixed pleomorphic lobular and apocrine carcinoma of the breast: A case report suggesting pathogenesis
Author(s) -
Ishii Akiko,
Oishi Takuma,
Kakuda Yuko,
Yasui Haruna,
Kawata Takuya,
Muramatsu Koji,
Takahashi Kaoru,
Sugino Takashi
Publication year - 2019
Publication title -
pathology international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.73
H-Index - 74
eISSN - 1440-1827
pISSN - 1320-5463
DOI - 10.1111/pin.12781
Subject(s) - apocrine , lobular carcinoma , pathology , carcinoma , ductal carcinoma , breast carcinoma , invasive lobular carcinoma , biology , medicine , breast cancer , cancer , invasive ductal carcinoma
Pleomorphic lobular carcinoma (PLC) of the breast is a variant of lobular carcinoma, characterized by loss of E‐cadherin expression and high‐grade morphologies. Whether the pathogenesis of PLC is in the ductal or the lobular lineage has been discussed. In this report, a case of PLC combined with apocrine carcinoma is presented. Histologically, the tumor showed two distinct carcinoma components: one was a typical apocrine carcinoma, and the other was a pleomorphic invasive lobular carcinoma. The former showed complete membranous expression of E‐cadherin, whereas the latter aberrantly expressed it not on the cell membrane, but in the cytoplasm. Both components were triple‐negative and strongly positive for GCDFP‐15, suggesting apocrine differentiation. The intraductal component showed only a feature of apocrine ductal carcinoma in situ. This case suggests that apocrine carcinoma could be an origin of PLC.