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    Does obesity modify the relationship between physical activity and breast cancer risk?

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    Fulltext not available
    Authors
    Neil-Sztramko, S.
    Boyle, Terry
    Milosevic, E.
    Nugent, S.
    Gotay, C.
    Campbell, K.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Neil-Sztramko, S. and Boyle, T. and Milosevic, E. and Nugent, S. and Gotay, C. and Campbell, K. 2017. Does obesity modify the relationship between physical activity and breast cancer risk? Breast Cancer Research and Treatment. 166 (2): pp. 367-381.
    Source Title
    Breast Cancer Research and Treatment
    DOI
    10.1007/s10549-017-4449-4
    ISSN
    0167-6806
    School
    School of Public Health
    URI
    http://hdl.handle.net/20.500.11937/59254
    Collection
    • Curtin Research Publications
    Abstract

    Purpose: With only 5–10% of breast cancer cases attributed to genetic inheritance, prevention efforts have focused on modifiable risk factors. Physical activity plays a role in reducing breast cancer risk; however, the interaction between physical activity and other modifiable risk factors, such as obesity, has received little attention. Methods: A systematic review and meta-analysis was conducted of studies examining the relationship between physical activity and breast cancer and how it may be modified by body mass index (BMI). Results: A total of 29 papers were included: 18 were cohort and 11 were case–control studies. Overall, a significant reduction in the relative risk of breast cancer was found in postmenopausal women with high versus low levels of physical activity for women with a BMI < 25 kg/m 2 (RR 0.85, 95% CI 0.79, 0.92) and =25 kg/m 2 (RR 0.87, 95% CI 0.81, 0.93) but not =30 kg/m 2 (RR: 0.93, 95% CI 0.76, 1.13). Physical activity was not associated with a significant reduction in risk of breast cancer in premenopausal women in any BMI group. Conclusion: The results of this meta-analysis suggest that physical activity is associated with a larger breast cancer risk reduction among women who are normal weight or overweight than among women who are obese. Since the included studies used diverse methods for assessment of physical activity and categories of BMI, results should be interpreted with caution and additional work is needed.

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