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Breast Cancer Research
Published in: Breast Cancer Research 3/2009

Open Access 01-06-2009 | Research article

MicroRNA signatures predict oestrogen receptor, progesterone receptor and HER2/neureceptor status in breast cancer

Authors: Aoife J Lowery, Nicola Miller, Amanda Devaney, Roisin E McNeill, Pamela A Davoren, Christophe Lemetre, Vladimir Benes, Sabine Schmidt, Jonathon Blake, Graham Ball, Michael J Kerin

Published in: Breast Cancer Research | Issue 3/2009

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Abstract

Introduction

Breast cancer is a heterogeneous disease encompassing a number of phenotypically diverse tumours. Expression levels of the oestrogen, progesterone and HER2/neu receptors which characterize clinically distinct breast tumours have been shown to change during disease progression and in response to systemic therapies. Mi(cro)RNAs play critical roles in diverse biological processes and are aberrantly expressed in several human neoplasms including breast cancer, where they function as regulators of tumour behaviour and progression. The aims of this study were to identify miRNA signatures that accurately predict the oestrogen receptor (ER), progesterone receptor (PR) and HER2/neu receptor status of breast cancer patients to provide insight into the regulation of breast cancer phenotypes and progression.

Methods

Expression profiling of 453 miRNAs was performed in 29 early-stage breast cancer specimens. miRNA signatures associated with ER, PR and HER2/neu status were generated using artificial neural networks (ANN), and expression of specific miRNAs was validated using RQ-PCR.

Results

Stepwise ANN analysis identified predictive miRNA signatures corresponding with oestrogen (miR-342, miR-299, miR-217, miR-190, miR-135b, miR-218), progesterone (miR-520g, miR-377, miR-527-518a, miR-520f-520c) and HER2/neu (miR-520d, miR-181c, miR-302c, miR-376b, miR-30e) receptor status. MiR-342 and miR-520g expression was further analysed in 95 breast tumours. MiR-342 expression was highest in ER and HER2/neu-positive luminal B tumours and lowest in triple-negative tumours. MiR-520g expression was elevated in ER and PR-negative tumours.

Conclusions

This study demonstrates that ANN analysis reliably identifies biologically relevant miRNAs associated with specific breast cancer phenotypes. The association of specific miRNAs with ER, PR and HER2/neu status indicates a role for these miRNAs in disease classification of breast cancer. Decreased expression of miR-342 in the therapeutically challenging triple-negative breast tumours, increased miR-342 expression in the luminal B tumours, and downregulated miR-520g in ER and PR-positive tumours indicates that not only is dysregulated miRNA expression a marker for poorer prognosis breast cancer, but that it could also present an attractive target for therapeutic intervention.
Appendix
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Metadata
Title
MicroRNA signatures predict oestrogen receptor, progesterone receptor and HER2/neureceptor status in breast cancer
Authors
Aoife J Lowery
Nicola Miller
Amanda Devaney
Roisin E McNeill
Pamela A Davoren
Christophe Lemetre
Vladimir Benes
Sabine Schmidt
Jonathon Blake
Graham Ball
Michael J Kerin
Publication date
01-06-2009
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 3/2009
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/bcr2257

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