www.eurekalert.org/pub_releases/2009-08/bcom-gsf072909. -
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Published on: 8/3/2009
Last Visited: 8/3/2009
These patterns resemble expression patterns more closely associated with cells with a mesenchymal (a form of connective tissue) phenotype (or appearance)," said Dr. Jenny Chang (http://www.bcm.edu/breastcenter/?PMID=10728), medical director of the Sue and Lester Smith Breast Center (http://www.bcm.edu/cancercenter/) at BCM and a professor of medicine.
Chang is a senior author of the paper along with Drs.
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They found that gene expression patterns in these chemoresistant cells represented a tumor-initiating gene signature, which was not only more easily detectable in a newly-defined breast cancer subtype called "claudin-low", but also enriched in human breast tumors after they had been treated with anti-cancer drugs that target the signals of hormones, said Chang.
They also found that genes associated with the mesenchymal cell phenotype were increased in breast tumors after hormone treatment.
"This study supports a growing body of evidence that there is a particular subpopulation of cells in breast cancer that may be responsible for disease recurrence, resistance to treatment, and perhaps metastasis (cancer spread)," said Chang.
In the future, she said, the group will be looking at ways to use the gene signature they have identified to develop drugs that can combine with conventional therapy to eradicate all populations of cells within tumors.