Abstract
Purpose
Mammographic breast and bone mineral densities (BMD) have been associated with luteal phase hormone concentrations in premenopausal women. We assessed the associations of breast and bone densities with follicular phase hormones and sex hormone binding globulin (SHBG) in premenopausal women, given that follicular phase hormones have been shown to be positively associated with premenopausal breast cancer risk.
Methods
One hundred and ninety-two 40–45-year-old women provided a spot urine and/or blood sample during the follicular phase. Hormone and SHBG concentrations, and bone density were measured and routine mammograms were accessed and digitized to obtain breast density measures. Regression models were fit to assess the associations between hormones and SHBG, and breast and bone densities.
Results
Positive associations were observed between percent breast density and SHBG (p trend = 0.02), as well as estradiol (p trend = 0.08), after controlling for body mass index (BMI), number of pregnancies, and breast feeding history. In addition, a statistically significant inverse association was observed between total testosterone and head BMD (p trend = 0.01), after controlling for BMI.
Conclusions
Associations were observed between breast and bone densities, and serum hormone concentrations during the follicular phase of the menstrual cycle.
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Acknowledgments
We wish to thank Kelly Ehrlich, Kathy Plant, and the GH Center for Health Studies for screening interviews, clinic visits, and study coordination and all the study participants. This work was supported by the National Institute of Health (R01CA97366) and the FHCRC Center Interdisciplinary Funds.
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Yong, M., Atkinson, C., Newton, K.M. et al. Associations between endogenous sex hormone levels and mammographic and bone densities in premenopausal women. Cancer Causes Control 20, 1039–1053 (2009). https://doi.org/10.1007/s10552-009-9321-3
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DOI: https://doi.org/10.1007/s10552-009-9321-3