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J Clin Oncol. 2010 Oct 1;28(28):4316-23. doi: 10.1200/JCO.2009.27.2419. Epub 2010 Aug 30.

Molecular anatomy of breast cancer stroma and its prognostic value in estrogen receptor-positive and -negative cancers.

Author information

  • 1Department of Breast Medical Oncology, Unit 1354, The University of Texas M. D. Anderson Cancer Center, PO Box 301439, Houston,TX 77230-1439, USA.

Erratum in

  • J Clin Oncol. 2010 Nov 10;28(32):4868.
  • J Clin Oncol. 2012 Feb 20;30(6):679.

Abstract

PURPOSE:

The purpose of this study was to identify genes enriched in breast cancer stroma, assess the stromal gene expression differences between estrogen receptor (ER) -positive and -negative cancers, and separately determine their prognostic value in these two subtypes of breast cancers.

METHODS:

We compared gene expression profiles of pairs of fine-needle (stroma-poor) and core-needle (stroma-rich) biopsies from 37 cancers to identify stroma-associated genes. We defined stromal metagenes and tested their prognostic values in 684 node-negative patients who received no systemic adjuvant therapy and 259 tamoxifen-treated patients.

RESULTS:

We identified 293 probe sets overexpressed in core biopsies; these included five highly coexpressed gene clusters (metagenes) corresponding to immune functions and extracellular matrix components. These genes showed quantitative and qualitative differences between ER-positive and ER-negative cancers. A B-cell/plasma cell metagene showed strong prognostic value in ER-positive highly proliferative cancers, a lesser prognostic value in ER-negative cancers, and no prognostic value in ER-positive cancers with low proliferation. The hazard ratio for distant relapse in the lowest compared with the highest tertile of the pooled prognostic data set was 4.29 (95% CI, 2.04 to 9.01; P = .001) in ER-positive cancers and 3.34 (95% CI, 1.60 to 6.97; P = .001) in ER-negative cancers. This remained significant in multivariate analysis including routine variables and other genomic prognostic scores. As a result of quantitative differences in this metagene between ER-positive and ER-negative cancers, different thresholds apply in the two subgroups. Other stromal metagenes had inconsistent prognostic value.

CONCLUSION:

Among ER-negative and ER-positive highly proliferative cancers, a subset of tumors with high expression of a B-cell/plasma cell metagene carries a favorable prognosis.

PMID:
20805453
[PubMed - indexed for MEDLINE]
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