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Original Article
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Volume 356:217-226 January 18, 2007 Number 3
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The Prognostic Role of a Gene Signature from Tumorigenic Breast-Cancer Cells
Rui Liu, Ph.D., Xinhao Wang, Ph.D., Grace Y. Chen, M.D., Ph.D., Piero Dalerba, M.D., Austin Gurney, Ph.D., Timothy Hoey, Ph.D., Gavin Sherlock, Ph.D., John Lewicki, Ph.D., Kerby Shedden, Ph.D., and Michael F. Clarke, M.D.

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ABSTRACT

Background Breast cancers contain a minority population of cancer cells characterized by CD44 expression but low or undetectable levels of CD24 (CD44+CD24–/low) that have higher tumorigenic capacity than other subtypes of cancer cells.

Methods We compared the gene-expression profile of CD44+CD24–/low tumorigenic breast-cancer cells with that of normal breast epithelium. Differentially expressed genes were used to generate a 186-gene "invasiveness" gene signature (IGS), which was evaluated for its association with overall survival and metastasis-free survival in patients with breast cancer or other types of cancer.

Results There was a significant association between the IGS and both overall and metastasis-free survival (P<0.001, for both) in patients with breast cancer, which was independent of established clinical and pathological variables. When combined with the prognostic criteria of the National Institutes of Health, the IGS was used to stratify patients with high-risk early breast cancer into prognostic categories (good or poor); among patients with a good prognosis, the 10-year rate of metastasis-free survival was 81%, and among those with a poor prognosis, it was 57%. The IGS was also associated with the prognosis in medulloblastoma (P=0.004), lung cancer (P=0.03), and prostate cancer (P=0.01). The prognostic power of the IGS was increased when combined with the wound-response (WR) signature.

Conclusions The IGS is strongly associated with metastasis-free survival and overall survival for four different types of tumors. This genetic signature of tumorigenic breast-cancer cells was even more strongly associated with clinical outcomes when combined with the WR signature in breast cancer.


Source Information

From the Departments of Internal Medicine (R.L., G.Y.C., P.D., M.F.C.) and Statistics (K.S.), University of Michigan, Ann Arbor; Oncomed Pharmaceuticals, Mountain View, CA (X.W., A.G., T.H., J.L.); the Stanford Institute for Stem Cell Biology and Regenerative Medicine, Palo Alto, CA (P.D., M.F.C.); and the Department of Genetics, Stanford University School of Medicine, Stanford, CA (G.S.).

Drs. Liu and Wang contributed equally to this article, and Drs. Chen and Dalerba contributed equally to this article.

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Related Letters:

A Gene Signature in Breast Cancer
Bertucci F., Cervera N., Birnbaum D., Wennmalm K., Miller L. D., Bergh J., Woodward W. A., Lucci A., Cristofanilli M., the Advanced Research Center for Micrometastatic Disease , Clarke M. F., Liu R., Wang X.
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N Engl J Med 2007; 356:1887-1888, May 3, 2007. Correspondence

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