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Journal of Clinical Oncology, Vol 26, No 15 (May 20), 2008: pp. 2568-2581
© 2008 American Society of Clinical Oncology.
DOI: 10.1200/JCO.2007.13.1748

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BIOLOGY OF NEOPLASIA

Basal-Like Breast Cancer: A Critical Review

Emad A. Rakha, Jorge S. Reis-Filho, Ian O. Ellis

From the Department of Histopathology, Nottingham City Hospital National Health Service (NHS) Trust; Nottingham University, Nottingham; and the Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London, United Kingdom

Corresponding author: Ian O. Ellis, FRCPath, Molecular Medical Sciences, University of Nottingham, Department of Histopathology, Nottingham City Hospital NHS Trust, Hucknall Road, Nottingham, NG5 1PB, UK; e-mail: ian.ellis{at}nottingham.ac.uk

Recent gene expression profiling of breast cancer has identified specific subtypes with clinical, biologic, and therapeutic implications. The basal-like group of tumors is characterized by an expression signature similar to that of the basal/myoepithelial cells of the breast and is reported to have transcriptomic characteristics similar to those of tumors arising in BRCA1 germline mutation carriers. They are associated with aggressive behavior and poor prognosis, and typically do not express hormone receptors or HER-2 ("triple-negative" phenotype). Therefore, patients with basal-like cancers are unlikely to benefit from currently available targeted systemic therapy. Although basal-like tumors are characterized by distinctive morphologic, genetic, immunophenotypic, and clinical features, neither an accepted consensus on routine clinical identification and definition of this aggressive subtype of breast cancer nor a way of systematically classifying this complex group of tumors has been described. Different definitions are, therefore, likely to produce variable and contradictory results that may hamper consistent identification and development of treatment strategies for these tumors. In this review, we discuss definition, heterogeneity, morphologic spectrum, relation to BRCA1, and clinical significance of this important class of breast cancer.

Terms in blue are defined in the glossary, found at the end of this article and online at www.jco.org.

Authors’ disclosures of potential conflicts of interest and author contributions are found at the end of this article.


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