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Cancer-obesity link discovery by MSU researchers could aid prevention efforts
Date:4/30/2009

EAST LANSING, Mich. A new link between body fat and cancer identified by a Michigan State University researcher underscores obesity's health risk and could lead to new cancer treatment and prevention strategies.

Jenifer Fenton, an MSU food science and human nutrition researcher with the Michigan Agricultural Experiment Station, identified the connection between obesity and colon cancer, the third-leading killer of Americans, in part by examining tissue hormones.

Working with MSU/MAES physiologist Julia Busik and biologist Fay Hansen-Smith of Oakland University in Rochester, Mich., Fenton examined a key hormone found in fat tissue and thought to promote cancer. Her conclusions are published in a study today in the journal Carcinogenesis.

Leptin a fat cell-derived hormone regulating body energy is higher in obese individuals. Fenton's study is the first to demonstrate that, at higher levels, leptin induces precancerous colon cells to produce more of a growth factor that can increase blood supply to early cancer cells promoting tumor growth and cancer progression.

"Adipose tissue, or fat, is recognized as a significant risk factor for diabetes and heart disease, but the role of adipose tissue in cancer risk is less understood," Fenton said. "Abdominal fat in particular seems to be associated with the greatest risk for cancer. As your waist-to-hip ratio increases, so does your risk for cancer, especially breast, colon and endometrial cancers."

Some 149,000 Americans will be diagnosed with colon cancer and 50,000 will die from it this year, according to the American Cancer Society. More than a million have been diagnosed with colon or rectal cancer in the U.S. as of 2006, the National Cancer Institute reported.

Fenton and her team focused on colon cancer because, unlike breast or prostate cancer, colon cancer affects both genders equally, allowing them broader reach and a larger impact on cancer pr
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Contact: Mark Fellows
mark.fellows@ur.msu.edu
517-884-0166
Michigan State University
Source:Eurekalert  

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