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J Cancer Epidemiol. 2009;2009:748367. doi: 10.1155/2009/748367. Epub 2009 Apr 16.

Weight History, Smoking, Physical Activity and Breast Cancer Risk among French-Canadian Women Non-Carriers of More Frequent BRCA1/2 Mutations.

Journal of cancer epidemiology

Vishnee Bissonauth, Bryna Shatenstein, Eve Fafard, Christine Maugard, André Robidoux, Steven Narod, Parviz Ghadirian

Affiliations

  1. Department of Nutrition, Faculty of Medicine, University of Montreal, Montreal, QC, Canada.

PMID: 20445803 PMCID: PMC2859024 DOI: 10.1155/2009/748367

Abstract

Several lifestyle factors play a significant role in determining an individual's risk of breast cancer. Many of them could be modified to protect against the malignancy. A nested case-control study was conducted to examine the association between selected lifestyle factors and non-BRCA-related breast cancer risk among French-Canadian women. Some 280 women with breast cancer and who were nongene carriers of mutated BRCA gene were recruited as cases. Another 280 women, without any cancer and nongene carriers of mutated BRCA gene served as controls. A tested lifestyle questionnaire was interviewer administered to incident cases to obtain information on weight history, smoking, physical activity, and other lifestyle risk factors. Odds ratios (ORs) and 95% confidence intervals (CIs) were estimated in logistic regression models. Comparing cases to controls, breast cancer risk was higher among subjects who reached their maximum body mass index (BMI) at an older age (>50 years) (OR = 2.83; 95% CI: 2.34-2.91). A positive association was noted between breast cancer risk and weight gain of >34 lbs compared to weight gain of 24 lbs compared to weight gain of 12 lbs compared to weight gain of 9 pack-years of cigarettes had a 59% higher breast cancer risk (P = .05). Subjects who engaged in >24.8 metabolic-equivalent- (MET-) hours per week compared to

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