American Journal of Epidemiology Advance Access originally published online on February 12, 2008
American Journal of Epidemiology 2008 167(5):586-597; doi:10.1093/aje/kwm361
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ORIGINAL CONTRIBUTIONS |
Adiposity, Physical Activity, and Pancreatic Cancer in the National Institutes of Health–AARP Diet and Health Cohort
1 Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Rockville, MD
2 Biostatistics Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Rockville, MD
3 Department of Epidemiology, Harvard School of Public Health, Boston, MA
4 Environmental Analysis Department, AARP, Washington, DC
5 Occupational Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Rockville, MD
Correspondence to Dr. Rachael Stolzenberg-Solomon, 6120 Executive Boulevard, Suite 320, Rockville, MD 20852 (e-mail: rs221z{at}nih.gov).
Received for publication March 23, 2007. Accepted for publication November 5, 2007.
Obesity and lack of physical activity have been inconsistently associated with pancreatic cancer. Using data from a self-administered baseline questionnaire (1995–1996), the authors investigated the association between adiposity and physical activity and pancreatic cancer in 495,035 participants of the National Institutes of Health–AARP Diet and Health Study who were aged 50–71 years. To avoid the influence of subclinical disease, follow-up time started 1 year after baseline, and subjects with a body mass index (BMI) of <18.5 kg/m2 were excluded. A subcohort (n = 302,060) completed a second questionnaire with information about physical activity and waist and hip circumference. During follow-up though 2000, 654 pancreatic cancer cases were identified. The authors used Cox proportional hazard models to generate adjusted hazard ratios and 95% confidence intervals. Compared with those with a BMI of 18.5–<25, those with a BMI of
35 had a 45% greater pancreatic cancer risk (95% confidence interval (CI): 1.04, 2.02; ptrend = 0.02). Significant positive associations for BMI were observed among nonsmokers (for BMI
35: hazard ratio = 1.70, 95% CI: 1.14, 2.53; ptrend = 0.004) but not recent smokers (pinteraction = 0.08). Waist circumference was positively associated with pancreatic cancer (fourth vs. first quartile: hazard ratio = 2.53, 95% CI: 1.13, 5.65; ptrend = 0.04) in women but not men. The authors observed no association with physical activity. Their results suggest a positive association between adiposity and pancreatic cancer.
adenocarcinoma; adiposity; body mass index; cohort studies; exercise; pancreatic neoplasms; smoking; waist-hip ratio
Abbreviations: BMI, body mass index; CI, confidence interval; HR, hazard ratio; MET, metabolic equivalent; NIH, National Institutes of Health
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