"A small, preliminary study found that marathoners were much more likely to have precancerous growths" As I understand it, the body has to repair more damage a

"A small, preliminary study found that marathoners were much more likely to have precancerous growths" As I understand it, the body has to repair more damage and there are more ways for a repair to go wrong even though the probability against a non-marathon for a repair to go wrong may be the same.