Physical activity and cancer: an umbrella review of the literature including 22 major anatomical sites and 770 000 cancer cases

To provide an overview of the breadth and validity of claimed associations between physical activity and risk of developing or dying from cancer.Umbrella review.We searched Medline, Embase, Cochrane Database and Web of Science.Systematic reviews about physical activity and cancer incidence and cancer mortality in different body sites among general population.We included 19 reviews covering 22 cancer sites, 26 exposure-outcome pairs meta-analyses...