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Mayo Clin Proc. 2016 Dec;91(12):1693-1705. doi: 10.1016/j.mayocp.2016.08.017.

Physical Activity and Risk of Colon Cancer in Diabetic and Nondiabetic US Adults.

Author information

1
Department of Epidemiology and Preventive Medicine, University of Regensburg, Regensburg, Germany. Electronic address: daniela.schmid@klinik.uni-regensburg.de.
2
Department of Epidemiology and Preventive Medicine, University of Regensburg, Regensburg, Germany.
3
Division of Cancer Epidemiology and Genetics, Metabolic Epidemiology Branch, National Cancer Institute, Bethesda, MD.

Abstract

OBJECTIVE:

To determine whether moderate to vigorous physical activity is associated with a decreased risk of colon cancer in diabetic patients.

PATIENTS AND METHODS:

We evaluated the association between physical activity and colon cancer in 25,753 patients with a self-reported history of diabetes and in 274,965 nondiabetic individuals from the National Institutes of Health-AARP Diet and Health Study who were aged 50 to 71 years in 1995-1996. Moderate to vigorous physical activity was assessed at baseline using a self-administered questionnaire. Follow-up for colon cancer incidence extended to December 31, 2011.

RESULTS:

During 13.0 years of follow-up, 480 diabetic patients and 4151 nondiabetic individuals had development of colon cancer. Among diabetic patients, compared with never/rarely engaging in physical activity, more than 7 h/wk of physical activity exhibited a reduced risk of colon cancer in the age- and sex-adjusted model (hazard ratio [HR], 0.74; 95% CI, 0.56-0.996; P=.16 for trend). This association was attenuated and no longer statistically significant after additional control for other covariates (HR, 0.78; 95% CI, 0.58-1.05; P=.29 for trend). By comparison, physical activity was inversely related to colon cancer risk in nondiabetic individuals (multivariate-adjusted HR, 0.81; 95% CI, 0.73-0.89; P<.001 for trend).

CONCLUSION:

In this investigation of the relationship between physical activity and colon cancer in diabetic patients, we found a statistically significant inverse relationship in the age- and sex-adjusted model, which was no longer statistically significant in the multivariate-adjusted model. A reduced risk was noted among nondiabetic individuals, irrespective of other covariates. Future studies with a larger number of participants are required to explore whether physical activity beneficially affects colon cancer risk among diabetic patients.

PMID:
27916155
DOI:
10.1016/j.mayocp.2016.08.017
[Indexed for MEDLINE]

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