Marathon and extreme runners much more likely to have pre-cancerous colon polyps, study says

A new study conducted by a Virginia doctor shows that comparatively young marathon and ultra-marathon runners are more apt to have pre-cancerous colon growths.

Dr. Timothy Cannon

The study by oncologist Timothy Cannon, who tested colonoscopies at the Inova Schar Cancer Institute in Fairfax, Va., on 100 volunteers aged 35 to 50, was showcased yesterday in a story by Roni Caryn Rabin in The New York Times.

"The results," the article says, "were staggering. Almost half the participants had polyps, and 15 percent had advanced adenomas likely to become cancerous."

The new study, the piece continued, "comes amid heightened concerns about a rise in colon and rectal cancer rates among adults under 50, a population that  historically has had a low risk of cancer."

Cannon, who ran the New York City marathon in 2010, is quoted believing that "after what I've seen from my patients and what we've found here, that extreme exercise may increase the risk."

As for continuing to run, he added that "you never want to give people an excuse not to exercise, because by and large we have bigger problems from people not exercising enough.

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