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Int. J. Environ. Res. Public Health 2016, 13(11), 1066; doi:10.3390/ijerph13111066

Associations of Breast Cancer Risk Factors with Premenopausal Sex Hormones in Women with Very Low Breast Cancer Risk

1
Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY 10032, USA
2
Channing Division of Network Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
3
Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
4
Health Sciences University of Mongolia, Ulaanbaatar 210648, Mongolia
5
Division of Reproductive Endocrinology and Infertility, Keck School of Medicine of the University of Southern California, Los Angeles, CA 90033, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Peter Baade
Received: 31 August 2016 / Revised: 20 October 2016 / Accepted: 26 October 2016 / Published: 31 October 2016
(This article belongs to the Special Issue Geographical Variation in Breast Cancer Outcomes)
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Abstract

Breast cancer incidence rates are low but rising in urban Mongolia. We collected reproductive and lifestyle factor information and measured anthropometrics and serum sex steroid concentrations among 314 premenopausal women living in Ulaanbaatar, Mongolia. Mean differences in hormone concentrations by these factors were calculated using age-adjusted quadratic regression splines. Estrone and estradiol in college-educated women were, respectively, 18.2% (p = 0.03) and 23.6% (p = 0.03) lower than in high-school-educated women. Progesterone concentrations appeared 55.8% lower (p = 0.10) in women residing in modern housing compared with women living in traditional housing (gers), although this finding was not statistically significant. Testosterone concentrations were positively associated with adiposity and central fat distribution; 17.1% difference (p = 0.001) for highest vs. lowest quarter for body mass index and 15.1% difference (p = 0.005) for waist-to-height ratio. Estrogens were higher in the follicular phase of women who breastfed each child for shorter durations. A distinct hormonal profile was associated with an urban lifestyle in premenopausal, Mongol women. In particular, heavier, more-educated women living in urban dwellings had higher testosterone and lower estrogen and progesterone levels. Higher breast cancer incidence in urban compared with rural women suggest that the hormonal profile associated with a more traditional lifestyle may be protective among Mongol women. View Full-Text
Keywords: breast cancer; sex steroids; estrogen; progesterone; testosterone; urban migration; Mongolia breast cancer; sex steroids; estrogen; progesterone; testosterone; urban migration; Mongolia
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MDPI and ACS Style

Houghton, L.C.; Ganmaa, D.; Rosenberg, P.S.; Davaalkham, D.; Stanczyk, F.Z.; Hoover, R.N.; Troisi, R. Associations of Breast Cancer Risk Factors with Premenopausal Sex Hormones in Women with Very Low Breast Cancer Risk. Int. J. Environ. Res. Public Health 2016, 13, 1066.

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