J Clin Oncol. 2005 Oct 10;23(29):7350-60. Epub 2005 Sep 6.

Molecular classification and molecular forecasting of breast cancer: ready for clinical application?

Brenton JD, Carey LA, Ahmed AA, Caldas C.

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Cancer Genomics Program, Department of Oncology, University of Cambridge, Hutchison/MRC Research Centre, Cambridge, United Kingdom CB22XZ.

Abstract

Profiling breast cancer with expression arrays has become common, and it has been suggested that the results from early studies will lead to understanding of the molecular differences between clinical cases and allow individualization of care. We critically review two main applications of expression profiling; studies unraveling novel breast cancer classifications and those that aim to identify novel markers for prediction of clinical outcome. Breast cancer may now be subclassified into luminal, basal, and HER2 subtypes with distinct differences in prognosis and response to therapy. However, profiling studies to identify predictive markers have suffered from methodologic problems that prevent general application of their results. Future work will need to reanalyze existing microarray data sets to identify more representative sets of candidate genes for use as prognostic signatures and will need to take into account the new knowledge of molecular subtypes of breast cancer when assessing predictive effects.

Comment in

J Clin Oncol. 2006 Feb 1;24(4):721-2; author reply 722-3.

PMID:: 16145060; [PubMed - indexed for MEDLINE]

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