Published in:
Open Access
01-06-2013 | Research article
Molecular apocrine breast cancers are aggressive estrogen receptor negative tumors overexpressing either HER2 or GCDFP15
Authors:
Jacqueline Lehmann-Che, Anne-Sophie Hamy, Raphaël Porcher, Marc Barritault, Fatiha Bouhidel, Hanadi Habuellelah, Solenne Leman-Detours, Anne de Roquancourt, Laurence Cahen-Doidy, Edwige Bourstyn, Patricia de Cremoux, Cedric de Bazelaire, Marcela Albiter, Sylvie Giacchetti, Caroline Cuvier, Anne Janin, Marc Espié, Hugues de Thé, Philippe Bertheau
Published in:
Breast Cancer Research
|
Issue 3/2013
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Abstract
Introduction
Molecular apocrine (MA) tumors are estrogen receptor (ER) negative breast cancers characterized by androgen receptor (AR) expression. We analyzed a group of 58 transcriptionally defined MA tumors and proposed a new tool to identify these tumors.
Methods
We performed quantitative reverse transcription PCR (qRT-PCR) for ESR1, AR, FOXA1 and AR-related genes, and immunohistochemistry (IHC) for ER, PR, Human Epidermal Growth Factor Receptor 2 (HER2), CK5/6, CK17, EGFR, Ki67, AR, FOXA1 and GCDFP15 and we analyzed clinical features.
Results
MA tumors were all characterized by ESR1(-) AR(+) FOXA1(+) and AR-related genes positive mRNA profile. IHC staining on these tumors showed 93% ER(-), only 58% AR(+) and 90% FOXA1(+). 67% and 57% MA tumors were HER2(3+) and GCDFP15(+), respectively. Almost all MA tumors (94%) had the IHC signature HER2(3+) or GCDFP15(+) but none of the 13 control basal-like (BL) tumors did. Clinically, MA tumors were rather aggressive, with poor prognostic factors.
Conclusion
MA tumors could be better defined by their qRT-PCR-AR profile than by AR IHC. In addition, we found that HER2 or GCDFP15 protein overexpression is a sensitive and specific tool to differentiate MA from BL in the context of ER negative tumors. A composite molecular and IHC signature could, therefore, help to identify MA tumors in daily practice.