Steven C Moore1, I-Min Lee2, Elisabete Weiderpass3, Peter T Campbell4, Joshua N Sampson1, Cari M Kitahara1, Sarah K Keadle1, Hannah Arem5, Amy Berrington de Gonzalez1, Patricia Hartge1, Hans-Olov Adami6, Cindy K Blair7, Kristin B Borch8, Eric Boyd9, David P Check1, Agnès Fournier10, Neal D Freedman1, Marc Gunter11, Mattias Johannson12, Kay-Tee Khaw13, Martha S Linet1, Nicola Orsini14, Yikyung Park15, Elio Riboli16, Kim Robien17, Catherine Schairer1, Howard Sesso2, Michael Spriggs9, Roy Van Dusen9, Alicja Wolk14, Charles E Matthews1, Alpa V Patel4. 1. Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland. 2. Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts. 3. Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Stockholm, Sweden4Department of Community Medicine, Faculty of Health Sciences, University of Tromsø, Arctic University of Norway, Tromsø, Norway5Genetic Epidemiology Group, Folkh. 4. Epidemiology Research Program, American Cancer Society, Atlanta, Georgia. 5. Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland8now with USAID Bureau for Global Health, Washington, DC. 6. Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Stockholm, Sweden9Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts. 7. Division of Epidemiology, Biostatistics, and Preventive Medicine, University of New Mexico, Albuquerque. 8. Department of Community Medicine, Faculty of Health Sciences, University of Tromsø, Arctic University of Norway, Tromsø, Norway. 9. Information Management Services, Inc, Rockville, Maryland. 10. Centre for Research in Epidemiology and Population Health, Institut Gustave Roussy, Villejuif, France. 11. Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, London, England14now with Section of Nutrition and Metabolism, International Agency for Research on Cancer, Lyon, France. 12. Genetic Epidemiology Group, International Agency for Research on Cancer (IARC), Lyon, France16Department of Biobank Research, Umeå University, Umeå, Sweden. 13. Cambridge Institute of Public Health, University of Cambridge, Cambridge, England. 14. Unit of Nutritional Epidemiology, Institute of Environmental Medicine, Karolinska Institute, Stockholm, Sweden. 15. Division of Public Health Sciences, Washington University School of Medicine, St Louis, Missouri. 16. Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, London, England. 17. Department of Exercise and Nutrition Sciences, Milken Institute School of Public Health, George Washington University, Washington, DC.
Abstract
IMPORTANCE: Leisure-time physical activity has been associated with lower risk of heart-disease and all-cause mortality, but its association with risk of cancer is not well understood. OBJECTIVE: To determine the association of leisure-time physical activity with incidence of common types of cancer and whether associations vary by body size and/or smoking. DESIGN, SETTING, AND PARTICIPANTS: We pooled data from 12 prospective US and European cohorts with self-reported physical activity (baseline, 1987-2004). We used multivariable Cox regression to estimate hazard ratios (HRs) and 95% confidence intervals for associations of leisure-time physical activity with incidence of 26 types of cancer. Leisure-time physical activity levels were modeled as cohort-specific percentiles on a continuous basis and cohort-specific results were synthesized by random-effects meta-analysis. Hazard ratios for high vs low levels of activity are based on a comparison of risk at the 90th vs 10th percentiles of activity. The data analysis was performed from January 1, 2014, to June 1, 2015. EXPOSURES: Leisure-time physical activity of a moderate to vigorous intensity. MAIN OUTCOMES AND MEASURES: Incident cancer during follow-up. RESULTS: A total of 1.44 million participants (median [range] age, 59 [19-98] years; 57% female) and 186 932 cancers were included. High vs low levels of leisure-time physical activity were associated with lower risks of 13 cancers: esophageal adenocarcinoma (HR, 0.58; 95% CI, 0.37-0.89), liver (HR, 0.73; 95% CI, 0.55-0.98), lung (HR, 0.74; 95% CI, 0.71-0.77), kidney (HR, 0.77; 95% CI, 0.70-0.85), gastric cardia (HR, 0.78; 95% CI, 0.64-0.95), endometrial (HR, 0.79; 95% CI, 0.68-0.92), myeloid leukemia (HR, 0.80; 95% CI, 0.70-0.92), myeloma (HR, 0.83; 95% CI, 0.72-0.95), colon (HR, 0.84; 95% CI, 0.77-0.91), head and neck (HR, 0.85; 95% CI, 0.78-0.93), rectal (HR, 0.87; 95% CI, 0.80-0.95), bladder (HR, 0.87; 95% CI, 0.82-0.92), and breast (HR, 0.90; 95% CI, 0.87-0.93). Body mass index adjustment modestly attenuated associations for several cancers, but 10 of 13 inverse associations remained statistically significant after this adjustment. Leisure-time physical activity was associated with higher risks of malignant melanoma (HR, 1.27; 95% CI, 1.16-1.40) and prostate cancer (HR, 1.05; 95% CI, 1.03-1.08). Associations were generally similar between overweight/obese and normal-weight individuals. Smoking status modified the association for lung cancer but not other smoking-related cancers. CONCLUSIONS AND RELEVANCE: Leisure-time physical activity was associated with lower risks of many cancer types. Health care professionals counseling inactive adults should emphasize that most of these associations were evident regardless of body size or smoking history, supporting broad generalizability of findings.
IMPORTANCE: Leisure-time physical activity has been associated with lower risk of heart-disease and all-cause mortality, but its association with risk of cancer is not well understood. OBJECTIVE: To determine the association of leisure-time physical activity with incidence of common types of cancer and whether associations vary by body size and/or smoking. DESIGN, SETTING, AND PARTICIPANTS: We pooled data from 12 prospective US and European cohorts with self-reported physical activity (baseline, 1987-2004). We used multivariable Cox regression to estimate hazard ratios (HRs) and 95% confidence intervals for associations of leisure-time physical activity with incidence of 26 types of cancer. Leisure-time physical activity levels were modeled as cohort-specific percentiles on a continuous basis and cohort-specific results were synthesized by random-effects meta-analysis. Hazard ratios for high vs low levels of activity are based on a comparison of risk at the 90th vs 10th percentiles of activity. The data analysis was performed from January 1, 2014, to June 1, 2015. EXPOSURES: Leisure-time physical activity of a moderate to vigorous intensity. MAIN OUTCOMES AND MEASURES: Incident cancer during follow-up. RESULTS: A total of 1.44 million participants (median [range] age, 59 [19-98] years; 57% female) and 186 932 cancers were included. High vs low levels of leisure-time physical activity were associated with lower risks of 13 cancers: esophageal adenocarcinoma (HR, 0.58; 95% CI, 0.37-0.89), liver (HR, 0.73; 95% CI, 0.55-0.98), lung (HR, 0.74; 95% CI, 0.71-0.77), kidney (HR, 0.77; 95% CI, 0.70-0.85), gastric cardia (HR, 0.78; 95% CI, 0.64-0.95), endometrial (HR, 0.79; 95% CI, 0.68-0.92), myeloid leukemia (HR, 0.80; 95% CI, 0.70-0.92), myeloma (HR, 0.83; 95% CI, 0.72-0.95), colon (HR, 0.84; 95% CI, 0.77-0.91), head and neck (HR, 0.85; 95% CI, 0.78-0.93), rectal (HR, 0.87; 95% CI, 0.80-0.95), bladder (HR, 0.87; 95% CI, 0.82-0.92), and breast (HR, 0.90; 95% CI, 0.87-0.93). Body mass index adjustment modestly attenuated associations for several cancers, but 10 of 13 inverse associations remained statistically significant after this adjustment. Leisure-time physical activity was associated with higher risks of malignant melanoma (HR, 1.27; 95% CI, 1.16-1.40) and prostate cancer (HR, 1.05; 95% CI, 1.03-1.08). Associations were generally similar between overweight/obese and normal-weight individuals. Smoking status modified the association for lung cancer but not other smoking-related cancers. CONCLUSIONS AND RELEVANCE: Leisure-time physical activity was associated with lower risks of many cancer types. Health care professionals counseling inactive adults should emphasize that most of these associations were evident regardless of body size or smoking history, supporting broad generalizability of findings.
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