. Recently two studies reported a strong association between high bone mass and increased risk of breast cancer. According to the applicant, this result raises new questions in decision-making for HRT and suggests a potential use of bone mass as an indicator of lifetime estrogen exposure for assessing risk of breast cancer. Additional studies in different ethnic groups appear warranted, because there is significant ethnic variation in frequencies, distributions and severity levels of both osteoporosis and breast cancer. Given the fact that the bone mineral density (BMD) is higher, but the rate of breast cancer is lower in Hispanic older women compared with Anglo women, the Hispanic postmenopausal women would be a model to further evaluate the relationship between breast cancer and bone mass. To date, most knowledge of risk factors of osteoporosis and breast cancer is mainly based on results from Anglo women. It is critical to examine those risk factors in the Hispanic population in order to form specific prevention strategies for this population. The Women's Health Initiative (WHI) provides a unique opportunity to undertake nested case-control studies (NCCS) to further examine these issues in different ethnic groups. However, within the WHI there will not be a sufficient number of breast cancer cases to form a NCCS in Hispanic women, both because the number of Hispanic women in the WHI BMD study cohorts is small (expected n=800) and because breast cancer rate is lower in Hispanic women compared with Anglo. The proposed study is a case-control research design. The controls will be chosen from the Hispanic participants of the Arizona WHI observation study group. No additional data will be collected from the controls. The case (n=140) will be newly diagnosed Hispanic postmenopausal breast cancer patients in Arizona (obtained through collaborative oncologists and surgeons). Measurements will include anthropometry, body composition, BMD, peripheral white blood cells and WHI questionnaires. The relationship between BMD and breast cancer will be evaluated using logistic regression analysis. Note: NIA is providing applicants with essentially unedited commentaries prepared by members of the review committee. The attached commentaries may contain divergent or conflicting views. It should be noted that critiques were prepared prior to the review meeting and they may or may not have been updated to reflect committee discussion. However, the recommendation and other initial sections of this summary statement are the authoritative representation of the final outcome of group discussion.

Agency
National Institute of Health (NIH)
Institute
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Type
Research Scientist Development Award - Research & Training (K01)
Project #
5K01AR002060-02
Application #
2769540
Study Section
Special Emphasis Panel (ZAG1-BJB-4 (A1))
Project Start
1997-09-30
Project End
2002-08-31
Budget Start
1998-09-01
Budget End
1999-08-31
Support Year
2
Fiscal Year
1998
Total Cost
Indirect Cost
Name
University of Arizona
Department
Type
Organized Research Units
DUNS #
City
Tucson
State
AZ
Country
United States
Zip Code
85721
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Chen, Zhao; Stini, William A; Marshall, James R et al. (2004) Wheat bran fiber supplementation and bone loss among older people. Nutrition 20:747-51
Chen, Zhao; Kooperberg, Charles; Pettinger, Mary B et al. (2004) Validity of self-report for fractures among a multiethnic cohort of postmenopausal women: results from the Women's Health Initiative observational study and clinical trials. Menopause 11:264-74
Chen, Z; Pettinger, M B; Ritenbaugh, C et al. (2003) Habitual tea consumption and risk of osteoporosis: a prospective study in the women's health initiative observational cohort. Am J Epidemiol 158:772-81