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Whole Genome Sequencing of Triple Negative Breast Cancer Reveals Previously Unreported Mutations
Date:12/6/2012

s examined in the study. Specific cancer genes overexpressed among tumors in the study's cohort included: ALK, AR, ARAF, BRAF, FGFR2, GLI1, GLI2, HRAS, 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. 

"Genome sequencing will eventually become a standard tool for oncologists," said Billings, "allowing them to tailor therapies to the unique genetic profiles of each of their patients."

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.

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