A prospective study of 100 participants who completed at least five marathons or two ultramarathons explored a potential association between intensive long-distance running and advanced adenomas of the colon. The study author emphasized that "this study was hypothesis-generating only and warrants further investigation" and stated "I don't know if there is an association" between endurance running and colorectal cancer risk. (The ASCO Post)
Hypothesis-generating study explores potential association between intensive long-distance running and advanced adenomas in runners aged 35–50
The CRC Digest