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.
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Nippon Med Coll Hosp, Dept Diagnost Pathol, Tokyo, JapanNippon Med Coll Hosp, Dept Diagnost Pathol, Tokyo, Japan
Ohashi, R.
Matsubara, M.
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Nippon Med Coll Hosp, Dept Diagnost Pathol, Tokyo, JapanNippon Med Coll Hosp, Dept Diagnost Pathol, Tokyo, Japan
Matsubara, M.
Watarai, Y.
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Nippon Med Coll Hosp, Dept Diagnost Pathol, Tokyo, JapanNippon Med Coll Hosp, Dept Diagnost Pathol, Tokyo, Japan
Watarai, Y.
Yanagihara, K.
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Nippon Med Coll Hosp, Dept Breast Surg, Tokyo, JapanNippon Med Coll Hosp, Dept Diagnost Pathol, Tokyo, Japan
Yanagihara, K.
Yamashita, K.
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Nippon Med Coll Hosp, Dept Breast Surg, Tokyo, JapanNippon Med Coll Hosp, Dept Diagnost Pathol, Tokyo, Japan
Yamashita, K.
Tsuchiya, S. -I.
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Nippon Med Coll Hosp, Dept Diagnost Pathol, Tokyo, Japan
Iida Hosp, Dept Diagnost Pathol, Tokyo, JapanNippon Med Coll Hosp, Dept Diagnost Pathol, Tokyo, Japan
Tsuchiya, S. -I.
Takei, H.
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Nippon Med Coll Hosp, Dept Breast Surg, Tokyo, JapanNippon Med Coll Hosp, Dept Diagnost Pathol, Tokyo, Japan
Takei, H.
Naito, Z.
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Nippon Med Coll Hosp, Dept Diagnost Pathol, Tokyo, Japan
Nippon Med Sch, Dept Integrated Diagnost Pathol, Tokyo, JapanNippon Med Coll Hosp, Dept Diagnost Pathol, Tokyo, Japan
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Guys Hosp, Guys & St Thomas NHS Fdn Trust, London SE1 9RT, EnglandGuys Hosp, Guys & St Thomas NHS Fdn Trust, London SE1 9RT, England
Masannat, Yazan A.
Bains, Salena K.
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Guys Hosp, Guys & St Thomas NHS Fdn Trust, London SE1 9RT, England
Kings Coll London, Guys Hosp, Div Canc Studies, Sect Res Oncol, London SE1 9RT, EnglandGuys Hosp, Guys & St Thomas NHS Fdn Trust, London SE1 9RT, England
Bains, Salena K.
Pinder, Sarah E.
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Guys Hosp, Guys & St Thomas NHS Fdn Trust, London SE1 9RT, England
Kings Coll London, Guys Hosp, Div Canc Studies, Sect Res Oncol, London SE1 9RT, EnglandGuys Hosp, Guys & St Thomas NHS Fdn Trust, London SE1 9RT, England
Pinder, Sarah E.
Purushotham, Arnie D.
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Guys Hosp, Guys & St Thomas NHS Fdn Trust, London SE1 9RT, England
Kings Coll London, Guys Hosp, Div Canc Studies, Sect Res Oncol, London SE1 9RT, EnglandGuys Hosp, Guys & St Thomas NHS Fdn Trust, London SE1 9RT, England