Chapter 8 Cancer. Chapter overview. Introduction Carcinogenesis Physical activity and colorectal cancer Physical activity and breast cancer Physical activity and other cancers Mechanisms Population-attributable risk Physical activity in cancer survivors Summary. Definition and risk.
Cancer is not one disease, but a set of diseases characterized by unregulated cell growth leading to invasion of surrounding tissues and spread to other parts of the body.
In developed countries, the lifetime risk of developing cancer is around 1 in 3.
Population-attributable risk estimates from International Agency for Research on Cancer (2002):