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Tissue around tumor holds key to fighting triple negative breast cancer
Date:9/19/2012

p cancer from spreading."

In the study, 357 genes were found to be induced by the increased presence of decorin, but more interestingly, the researchers discovered that three of these genes, which were previously unlinked to triple negative breast cancer, were tumor suppressor genes affecting the tumor microenvironment, including Bmp2K, Zc3hav1, and PEG3.

Decorin is a naturally occurring substance in the connective tissue where, among other roles, it helps regulate cell growth by interacting with growth factors and collagen. A decade ago, Dr. Iozzo and his team discovered that decorin, a cell protein, and specifically, a proteoglycan, is increased in the matrix surrounding tumor cells. They also discovered that decorin causes production of a protein, p21, which also can arrest cell growth. However, decorin's role in breast cancer and the mechanism behind its anti-tumor properties remained elusive.

For this study, researchers aimed to investigate the impact of decorin in triple negative breast cancer tumors using human cell lines in mice, as well analyze gene expression activity in the tumor microenvironment.

Tumors treated with decorin were found to have a decreased volume of up to 50 percent after 23 days. Using a sophisticated microarray technique, the researchers then analyzed the mouse tumor microenvironment, finding increased expression of 357 genes, three of which are the tumor suppressor genes of interest.

These results demonstrate a novel role for decorin in reduction or prevention of tumor metastases that could eventually lead to improved therapeutics for metastatic breast cancer.

"Here, we have a molecule that can turn a tumor microenvironment from a bad neighborhood to a clean neighborhood by inducing genes in that neighborhood to stop growth and prevent the tumor from metastasizing," said Dr. Iozzo.


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Contact: Steve Graff
stephen.graff@jefferson.edu
215-955-5291
Thomas Jefferson University
Source:Eurekalert

Page: 1 2

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