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TGen-US Oncology data guides treatment of metastatic triple-negative breast cancer patients
Date:12/6/2012

S, HSP90AA1, KRAS, MET, NOTCH2, NOTCH3, and SHH. Significantly underexpressed cancer genes included: BRCA1, BRCA2, CDKN2A, CTNNA1, DKK1, FBXW7, NF1, PTEN, and SFN.

Each tumor was genomically unique, but nine of the 14 contained alterations in one or both of two particular cellular pathways: RAS/RAF/MEK/ERK and PI3K/AKT/MTOR. Targeted therapeutic intervention aimed at these pathways achieved impressive responses in several cases.

"Importantly, the analysis provided insights into the potential unique therapeutic vulnerabilities of each cancer," said Dr. Joyce O'Shaughnessy, M.D., the study's other co-lead author. Dr. O'Shaughnessy is a practicing oncologist with Texas Oncology an affiliate of The US Oncology Network and is the Celebrating Women Chair of Breast Cancer Research at Baylor Charles A. Sammons Cancer Center.

Metastatic TNBC is a highly aggressive form of breast cancer that disproportionately affects African-Americans. It is called triple-negative because tumors do not express the estrogen receptor, progesterone receptor or HER-2, the biomarkers successfully targeted in most breast cancers.

Metastatic TNBC also has a poor prognosis once the cancer has spread to other organs, with a median survival rate among metastatic patients of only one year. While TNBC accounts for only about 15 percent of all breast cancers, its more aggressive biology makes it responsible for nearly one in four deaths related to this disease.

"The nature of this disease cries out for innovative research techniques such as whole genome sequencing coupled with new tools for data analysis," said Dr. David Craig, Ph.D., TGen's Deputy Director of Bioinformatics, and one of the study's co-lead authors.

"We are aware that these results are preliminary and based on a small series of patients," said Carpten. "However, our study will pave the way for new clinical trials and novel hypotheses for future testing in a very difficult to treat
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Contact: Steve Yozwiak
syozwiak@tgen.org
602-343-8704
The Translational Genomics Research Institute
Source:Eurekalert

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