Search publications
Title: Obesity, physical activity and cancer risks: Results from the Cancer, Lifestyle and Evaluation of Risk Study (CLEAR)
Authors: Nunez C; Bauman A; Egger S; Sitas F; Nair-Shalliker V
Categories: Cancer Type - Bowel & Colorectal Cancer
Cancer Type - Breast Cancer
Cancer Type - Endometrial Cancer
Cancer Type - Ovarian Cancer
Etiology - Endogenous Factors in the Origin and Cause of Cancer
Year: 2017
Journal Title: Cancer Epidemiology
Volume: 47
Page number start: 56
Page number end: 63
Abstract: Introduction Physical activity (PA) has been associated with lower risk of cardiovascular diseases, but the evidence linking PA with lower cancer risk is inconclusive. We examined the independent and interactive effects of PA and obesity using body mass index (BMI) as a proxy for obesity, on the risk of developing prostate (PC), postmenopausal breast (BC), colorectal (CRC), ovarian (OC) and uterine (UC) cancers. Methods We estimated odds ratios (OR) and 95% confidence intervals (CI), adjusting for cancer specific confounders, in 6831 self-reported cancer cases and 1992 self-reported cancer-free controls from the Cancer Lifestyle and Evaluation of Risk Study, using unconditional logistic regression. Results For women, BMI was positively associated with UC risk; specifically, obese women (BMI ≥30 kg/m2) had nearly twice the risk of developing UC compared to women with healthy-BMI-range (<25 kg/m2) (OR = 1.99;CI:1.31–3.03). For men, BMI was also positively associated with the risk of developing any cancer type, CRC and PC. In particular, obese men had 37% (OR = 1.37;CI:1.11–1.70), 113% (OR = 2.13;CI:1.55–2.91) and 51% (OR = 1.51;CI:1.17-1.94) higher risks of developing any cancer, CRC and PC respectively, when compared to men with healthy-BMI-range (BMI<25 kg/m2). Among women, PA was inversely associated with the risks of CRC, UC and BC. In particular, the highest level of PA (versus nil activity) was associated with reduced risks of CRC (OR = 0.60;CI:0.44–0.84) and UC (OR = 0.47;CI:0.27–0.80). Reduced risks of BC were associated with low (OR = 0.66;CI:0.51–0.86) and moderate (OR = 0.72;CI:0.57–0.91) levels of PA. There was no association between PA levels and cancer risks for men. We found no evidence of an interaction between BMI and PA in the CLEAR study. Conclusion These findings suggest that PA and obesity are independent cancer risk factors.
Division: Cancer Research Division
DOI: 10.1016/j.canep.2017.01.002
Appears in Collections:Research Articles

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.