Obesity, Exercise May Affect Risk for Key Type of Colon Cancer ...

February 26, 2013

TUESDAY, Feb. 26 (HealthDay News) ? Obesity increases a person?s risk for a certain type of colorectal cancer, while exercise lowers the risk, according to a new study.

Researchers analyzed data from women in the U.S. Nurses? Health Study and men in the Health Professionals Study to determine if there was a link between weight, exercise and the risk for CTNNB1-positive or CTNNB1-negative colorectal cancer.

CTNNB1 is a molecule implicated in cancer and obesity.

A higher body-mass index, or BMI (a measurement of body fat based on height and weight), was associated with an increased risk of CTNNB1-negative colorectal cancer, while physical activity was associated with a lower risk.

BMI and physical activity had no effect on the risk for CTNNB1-positive colorectal cancer, according to the study appearing Feb. 26 in the journal Cancer Research.

?Our results provide additional evidence for a causal role of obesity and a physically inactive lifestyle in a specific molecular subtype of colorectal cancer,? Dr. Shuji Ogino, an associate professor of pathology at Dana-Farber Cancer Institute and an associate professor in the department of epidemiology at Harvard School of Public Health, said in a journal news release.

?If physicians are able to identify individuals who are prone to develop CTNNB1-negative cancer, then it would be possible to strongly recommend physical activity,? Ogino added.

The findings also suggest that CTNNB1 could be a potential target for drugs to prevent and treat colorectal cancer in certain patients, Ogino said.

More information

The American Cancer Society has more about colorectal cancer.

Source: http://news.health.com/2013/02/26/obesity-exercise-may-affect-risk-for-key-type-of-colon-cancer/

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