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Researchers find driver of breast cancer stem cell metastasis
Date:7/24/2012

ANN ARBOR, Mich. Researchers at the University of Michigan Comprehensive Cancer Center have found that a cancer gene linked to aggressive spread of the disease promotes breast cancer stem cells. The finding implies a new way to target the behavior of these lethal cells.

The finding involves the cancer gene RhoC, which has previously been shown to promote metastasis of many types of cancer. RhoC levels increase as breast cancer progresses and high levels of RhoC are associated with worse patient survival.

Cancer stem cells are the small number of cells within a tumor that are believed to fuel the tumor's growth and spread. Researchers believe traditional chemotherapy and radiation treatments often become ineffective because they do not kill the cancer stem cells, and that the key to future treatments is to develop drugs that target and kill these cells.

This new study, which appears online in PLoS ONE, suggests a new way to get at the cancer stem cells.

"Targeting the specific molecular cogs driving the cancer stem cell machinery responsible for the cancer spreading has potential for future treatments. Eliminating cancer stem cells may ultimately be necessary to cure certain cancers, but in the meantime, we may be able to manage the cancer stem cell population and the invasive behaviors of these cells by disrupting the molecular machinery, using RhoC as a target," says senior study author Sofia D. Merajver, M.D., Ph.D., professor of internal medicine and epidemiology at the University of Michigan and scientific director of the breast oncology program at the U-M Comprehensive Cancer Center.

The researchers looked at breast cancer cell lines that were highly metastatic and cell lines from normal breast tissue. By inhibiting or overexpressing RhoC, they found that RhoC expression is necessary to cause metastasis in both cell lines, and that RhoC overexpression alone can cause metastasis. The researchers also tested
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Contact: Nicole Fawcett
nfawcett@umich.edu
734-764-2220
University of Michigan Health System
Source:Eurekalert

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