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Breast Cancer Research
Published in: Breast Cancer Research 6/2011

Open Access 01-12-2011 | Research article

Cancer stem cell markers in breast cancer: pathological, clinical and prognostic significance

Authors: H Raza Ali, Sarah-Jane Dawson, Fiona M Blows, Elena Provenzano, Paul D Pharoah, Carlos Caldas

Published in: Breast Cancer Research | Issue 6/2011

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Abstract

Introduction

The cancer stem cell (CSC) hypothesis states that tumours consist of a cellular hierarchy with CSCs at the apex driving tumour recurrence and metastasis. Hence, CSCs are potentially of profound clinical importance. We set out to establish the clinical relevance of breast CSC markers by profiling a large cohort of breast tumours in tissue microarrays (TMAs) using immunohistochemistry (IHC).

Methods

We included 4, 125 patients enrolled in the SEARCH population-based study with tumours represented in TMAs and classified into molecular subtype according to a validated IHC-based five-marker scheme. IHC was used to detect CD44/CD24, ALDH1A1, aldehyde dehydrogenase family 1 member A3 (ALDH1A3) and integrin alpha-6 (ITGA6). A 'Total CSC' score representing expression of all four CSC markers was also investigated. Association with breast cancer specific survival (BCSS) at 10 years was assessed using a Cox proportional-hazards model. This study was complied with REMARK criteria.

Results

In ER negative cases, multivariate analysis showed that ITGA6 was an independent prognostic factor with a time-dependent effect restricted to the first two years of follow-up (hazard ratio (HR) for 0 to 2 years follow-up, 2.4; 95% confidence interval (95% CI), 1.2 to 4.8; P = 0.009). The composite 'Total CSC' score carried independent prognostic significance in ER negative cases for the first four years of follow-up (HR for 0 to 4 years follow-up, 1.3; 95% CI, 1.1 to 1.6; P = 0.006).

Conclusions

Breast CSC markers do not identify identical subpopulations in primary tumours. Both ITGA6 and a composite Total CSC score show independent prognostic significance in ER negative disease. The use of multiple markers to identify tumours enriched for CSCs has the greatest prognostic value. In the absence of more specific markers, we propose that the effective translation of the CSC hypothesis into patient benefit will necessitate the use of a panel of markers to robustly identify tumours enriched for CSCs.
Appendix
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Metadata
Title
Cancer stem cell markers in breast cancer: pathological, clinical and prognostic significance
Authors
H Raza Ali
Sarah-Jane Dawson
Fiona M Blows
Elena Provenzano
Paul D Pharoah
Carlos Caldas
Publication date
01-12-2011
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 6/2011
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/bcr3061

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