Abstract
Background
Physical activity is a modifiable lifestyle factor associated with reduced breast cancer risk. Mammographic density is a strong, independent risk factor for breast cancer, and some breast cancer risk factors have been shown to modify mammographic density. However, the effect of physical activity on mammographic density, studied predominantly among Caucasians, has yielded conflicting results. In this study, we examined, in an Asian population, the association between physical activity and mammographic density.
Methods
We conducted a cross-sectional study of 2,377 Malaysian women aged 40–74 years. Physical activity information was obtained at screening mammogram and mammographic density was measured from mammograms by the area-based STRATUS method (n = 1,522) and the volumetric Volpara™ (n = 1,200) method. Linear regression analyses were performed to evaluate the association between physical activity and mammographic density, adjusting for potential confounders.
Results
We observed that recent physical activity was associated with area-based mammographic density measures among postmenopausal women, but not premenopausal women. In the fully adjusted model, postmenopausal women with the highest level of recent physical activity had 8.0 cm2 [95% confidence interval: 1.3, 14.3 cm2] lower non-dense area and 3.1% [0.1, 6.3%] higher area-based percent density, compared to women with the lowest level of recent physical activity. Physical activity was not associated to volumetric mammographic density.
Conclusions
Our findings suggest that the beneficial effects of physical activity on breast cancer risk may not be measurable through mammographic density. Future research is needed to identify appropriate biomarkers to assess the effect of physical activity on breast cancer risk.
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Acknowledgments
We thank participants for taking part in this study, all staff at the Health Screening Centre and Imaging Department of Subang Jaya Medical Centre and the Biomedical Imaging Department of University Malaya Medical Centre (particularly Dr Kartini Rahmat and Prof Ng Kwan Hoong) for assistance in patient recruitment, mammographic screening, and reporting.
Funding
The MyMammo study is funded by the funds raised through the Sime Darby LPGA Tournament; the University Malaya Research Grant [RP046B-15HTM]; and the High Impact Research Grant [UM.C/625/1/HIR-MOHE].
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committees and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Soh, W.H., Rajaram, N., Mariapun, S. et al. Physical activity and mammographic density in an Asian multi-ethnic cohort. Cancer Causes Control 29, 883–894 (2018). https://doi.org/10.1007/s10552-018-1064-6
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DOI: https://doi.org/10.1007/s10552-018-1064-6