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Physical Activity and Male Colorectal Cancer Survival
Jeffrey A. Meyerhardt, MD, MPH;
Edward L. Giovannucci, MD, ScD;
Shuji Ogino, MD, PhD;
Gregory J. Kirkner;
Andrew T. Chan, MD, MPH;
Walter Willett, MD, DrPH;
Charles S. Fuchs, MD, MPH
Arch Intern Med. 2009;169(22):2102-2108.
Background Although physically active individuals have a lower risk of developing colorectal cancer, few studies have examined whether exercise benefits colorectal cancer survivors.
Methods Derived from the Health Professionals Follow-up Study, we studied colorectal cancer–specific and overall mortality in a cohort of 668 men with a history of stage I to stage III colorectal cancer according to predefined physical activity categories after diagnosis. To minimize bias by occult recurrences, we excluded men who died within 6 months of their postdiagnosis physical activity assessment.
Results In a cohort of men with colorectal cancer and no apparent metastases at diagnosis, 50.4% exercised at least 18 metabolic equivalent task (MET) hours per week. Increased physical activity was significantly associated with improved colorectal cancer–specific mortality (P = .002 for trend) and overall mortality (P < .001 for trend). Men who engaged in more than 27 MET hours per week of physical activity had an adjusted hazard ratio for colorectal cancer–specific mortality of 0.47 (95% confidence interval, 0.24-0.92) compared with men who engaged in 3 or less MET hours per week of physical activity. The apparent benefit of physical activity was seen regardless of age, disease stage, body mass index, diagnosis year, tumor location, and prediagnosis physical activity.
Conclusion In a large cohort of men with a history of nonmetastatic colorectal cancer, more physical activity was associated with a lower risk of colorectal cancer–specific and overall mortality.
Author Affiliations: Department of Medical Oncology, Dana-Farber Cancer Institute (Drs Meyerhardt, Ogino, and Fuchs), Channing Laboratory, Department of Medicine (Drs Giovannucci, Ogino, Chan, Willett, and Fuchs and Mr Kirkner), and Department of Pathology (Dr Ogino), Brigham and Women's Hospital and Harvard Medical School, Departments of Nutrition and Epidemiology, Harvard School of Public Health (Drs Giovannucci and Willett), and Gastrointestinal Unit, Massachusetts General Hospital (Dr Chan), Boston.
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