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TGen and Genomic Health Inc. discover genes affecting cancer drug
Date:1/13/2011

PHOENIX, Ariz. Jan. 13, 2011 Genomic research could help doctors better target a drug widely used to treat colorectal cancer patients, according to a study by Genomic Health Inc. (Nasdaq: GHDX) and the Translational Genomics Research Institute (TGen).

The drug, oxaliplatin, is widely used in colon cancer. It is used in early disease, following surgery in those cancers that are likely to recur. It is also used in advanced disease to slow progression of the cancer where it has spread to other parts of the body.

However, a significant number of patients experience serious side effects, including prolonged damage to the nervous system, "creating an urgent need to identify genes that are responsible for drug sensitivity or resistance, which results in directing therapy to those most likely to benefit," according to the study published in Molecular Cancer Research.

Colorectal cancer is the third most common type of cancer in the U.S., annually diagnosed in more than 146,000 Americans. It also is the third highest cause of cancer death in the U.S., annually killing nearly 50,000 people, more than who die each year on the nation's roadways. This cancer affects men and women in nearly equal numbers.

Nerve damage, or neurotoxicity, associated with oxaliplatin is most commonly manifest as pain or a loss of sensation in the hands and feet and can severely affect a patient's quality of life and ability to work. These symptoms are experienced in some form by the majority of patients receiving this drug and, for some patients, can be permanent.

The TGen/Genomic Health researchers examined the role of individual cancer genes to influence the sensitivity or resistance of colon cancer cells grown in laboratory culture. An interfering RNA screen of 500 genes with 2,000 unique siRNA sequences identified 27 genes that, when silenced, altered the sensitivity of colon tumor cells to oxaliplatin, causing damage to the cancer c
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Contact: Steve Yozwiak
syozwiak@tgen.org
602-343-8704
The Translational Genomics Research Institute
Source:Eurekalert

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