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Published in: Breast Cancer Research 3/2013

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.
Appendix
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Metadata
Title
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
Publication date
01-06-2013
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 3/2013
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/bcr3421

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