Ovarian Hormones and Reproductive Risk Factors For Breast Cancer in Premenopausal Women: The Norwegian EBBA-I Study

DSpace/Manakin Repository

Ovarian Hormones and Reproductive Risk Factors For Breast Cancer in Premenopausal Women: The Norwegian EBBA-I Study

Citable link to this page

 

 
Title: Ovarian Hormones and Reproductive Risk Factors For Breast Cancer in Premenopausal Women: The Norwegian EBBA-I Study
Author: Iversen, A.; Thune, I.; McTiernan, A.; Emaus, A.; Finstad, S.E.; Flote, V.; Wilsgaard, T.; Lipson, Susan Fay; Ellison, Peter T.; Jasienska, G.; Furberg, A.S.

Note: Order does not necessarily reflect citation order of authors.

Citation: Iversen, A., I. Thune, A. McTiernan, A. Emaus, S.E. Finstad, V. Flote, T. Wilsgaard, et al. 2011. Ovarian hormones and reproductive risk factors for breast cancer in premenopausal women: the Norwegian EBBA-I study. Human Reproduction 26(6): 1519-1529.
Full Text & Related Files:
Abstract: BACKGROUND: Ovarian hormones, parity and length of 'menarche-to-first birth' time interval are known risk factors for breast cancer, yet the associations between I 7\(\beta\)-estradiol, progesterone and these reproductive factors remain unclear. METHODS: A total of 204 women (25-35 years) who participated in the Norwegian EBBA-I study collected daily saliva samples for one complete menstrual cycle, and filled in a reproductive history questionnaire. Anthropometry was measured and saliva samples were analyzed for ovarian hormones. Associations between parity, the interval and ovarian hormones, and effects of hormone-related lifestyle factors were studied in linear regression models. RESULTS: Mean age was 30.7 years, and age of menarche 13.1 years. Parous women had on average 1.9 births, and age at first birth was 24.5 years. No association was observed between parity and ovarian steroids. In nulliparous women, higher waist circumference (\(\ge\))77.75 cm) and longer oral contraceptive (OC) use (\(\ge\))3 years) were associated with higher levels of I 7\(\beta\)-estradiol. Short (< 10 years) versus long (>13.5 years) 'menarche-to-first birth' interval was associated with higher overall mean (P\(_{trend}\) = 0.029), 47% higher maximum peak and 30% higher mid-cycle levels of I 7\(\beta\)-estradiol. We observed a 2.6% decrease in overall mean salivary I 7\(\beta\)-estradiol with each 1-year increase in the interval. CONCLUSIONS: Nulliparous women may be more susceptible to lifestyle factors, abdominal overweight and past OC use, influencing metabolic and hormonal profiles and thus breast cancer risk. Short time between 'menarche-to-first birth' is linked to higher ovarian hormone levels among regularly cycling women, suggesting that timing of first birth is related to fecundity.
Published Version: 10.1093/humrep/der081
Other Sources: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3096559/pdf/
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:11213362
Downloads of this work:

Show full Dublin Core record

This item appears in the following Collection(s)

 
 

Search DASH


Advanced Search
 
 

Submitters