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Published in: Breast Cancer Research 5/2007

Open Access 01-10-2007 | Research article

Gene expression profiling and histopathological characterization of triple-negative/basal-like breast carcinomas

Authors: Bas Kreike, Marieke van Kouwenhove, Hugo Horlings, Britta Weigelt, Hans Peterse, Harry Bartelink, Marc J van de Vijver

Published in: Breast Cancer Research | Issue 5/2007

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Abstract

Introduction

Breast cancer is a heterogeneous group of tumors, and can be subdivided on the basis of histopathological features, genetic alterations and gene-expression profiles. One well-defined subtype of breast cancer is characterized by a lack of HER2 gene amplification and estrogen and progesterone receptor expression ('triple-negative tumors'). We examined the histopathological and gene-expression profile of triple-negative tumors to define subgroups with specific characteristics, including risk of developing distant metastases.

Methods

97 triple-negative tumors were selected from the fresh-frozen tissue bank of the Netherlands Cancer Institute, and gene-expression profiles were generated using 35K oligonucleotide microarrays. In addition, histopathological and immunohistochemical characterization was performed, and the findings were associated to clinical features.

Results

All triple-negative tumors were classified as basal-like tumors on the basis of their overall gene-expression profile. Hierarchical cluster analysis revealed five distinct subgroups of triple-negative breast cancers. Multivariable analysis showed that a large amount of lymphocytic infiltrate (HR = 0.30, 95% CI 0.09–0.96) and absence of central fibrosis in the tumors (HR = 0.14, 95% CI 0.03–0.62) were associated with distant metastasis-free survival.

Conclusion

Triple-negative tumors are synonymous with basal-like tumors, and can be identified by immunohistochemistry. Based on gene-expression profiling, basal-like tumors are still heterogeneous and can be subdivided into at least five distinct subgroups. The development of distant metastasis in basal-like tumors is associated with the presence of central fibrosis and a small amount of lymphocytic infiltrate.
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Metadata
Title
Gene expression profiling and histopathological characterization of triple-negative/basal-like breast carcinomas
Authors
Bas Kreike
Marieke van Kouwenhove
Hugo Horlings
Britta Weigelt
Hans Peterse
Harry Bartelink
Marc J van de Vijver
Publication date
01-10-2007
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 5/2007
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/bcr1771

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Keynote webinar | Spotlight on antibody–drug conjugates in cancer

Antibody–drug conjugates (ADCs) are novel agents that have shown promise across multiple tumor types. Explore the current landscape of ADCs in breast and lung cancer with our experts, and gain insights into the mechanism of action, key clinical trials data, existing challenges, and future directions.

Dr. Véronique Diéras
Prof. Fabrice Barlesi
Developed by: Springer Medicine