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Journal ArticleDOI

The use of estrogens and progestins and the risk of breast cancer in postmenopausal women.

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TLDR
In this paper, the effect of adding progestins to estrogen therapy on the risk of breast cancer in postmenopausal women is investigated. But, the effect on the number of newly diagnosed invasive breast cancer cases was not quantified.
Abstract
Background The effect of adding progestins to estrogen therapy on the risk of breast cancer in postmenopausal women is controversial. Methods To quantify the relation between the use of hormones and the risk of breast cancer in postmenopausal women, we extended our follow-up of the participants in the Nurses' Health Study to 1992. The women were asked to complete questionnaires every two years to update information on their menopausal status, use of estrogen and progestin preparations, and any diagnosis of breast cancer. During 725,550 person-years of follow-up, we documented 1935 cases of newly diagnosed invasive breast cancer. Results The risk of breast cancer was significantly increased among women who were currently using estrogen alone (relative risk, 1.32; 95 percent confidence interval, 1.14 to 1.54) or estrogen plus progestin (relative risk, 1.41; 95 percent confidence interval, 1.15 to 1.74), as compared with postmenopausal women who had never used hormones. Women currently taking hormones who ha...

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Citations
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Journal ArticleDOI

Risks and benefits of estrogen plus progestin in healthy postmenopausal women: Principal results from the Women's Health Initiative randomized controlled trial

TL;DR: Overall health risks exceeded benefits from use of combined estrogen plus progestin for an average 5.2-year follow-up among healthy postmenopausal US women, and the results indicate that this regimen should not be initiated or continued for primary prevention of CHD.
Journal ArticleDOI

Breast cancer and hormone replacement therapy: collaborative reanalysis of data from 51 epidemiological studies of 52 705 women with breast cancer and 108 411 women without breast cancer

Eugenia E. Calle, +194 more
- 11 Oct 1997 - 
TL;DR: Of the many factors examined that might affect the relation between breast cancer risk and use of HRT, only a woman's weight and body-mass index had a material effect: the increase in the relative risk of breast cancer diagnosed in women using HRT and associated with long durations of use in current and recent users was greater for women of lower than of higher weight or body- mass index.
Journal ArticleDOI

Design of the Women's Health Initiative clinical trial and observational study

TL;DR: The rationale for the interventions being studied in each of the CT components and for the inclusion of the OS component is described, including a brief description of the scientific and logistic complexity of the WHI.
References
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Journal ArticleDOI

Variations in mortality by weight among 750,000 men and women.

TL;DR: The mortality findings of this study match closely those of the Build and Blood Pressure Study 1959 based on the experience of 412 million insured persons.
Journal ArticleDOI

Estrogens, Progestogens, Normal Breast Cell Proliferation, and Breast Cancer Risk

TL;DR: The results of the various breast cell proliferation studies in relation to breast cancer are unclear and research identifying a molecular explanation would help in understanding the different findings.
Journal ArticleDOI

The role of oestrogens and progestagens in the epidemiology and prevention of breast cancer

TL;DR: Both hypotheses suggest that the risk of breast cancer could be reduced by delaying the onset of regular ovulatory menstrual cycles and by minimizing the therapeutic use of oestrogens, and possibly of progestagens, in postmenopausal women.
Journal ArticleDOI

The risk of breast cancer after estrogen and estrogen-progestin replacement.

TL;DR: In this cohort, long-term perimenopausal treatment with estrogens (or at least estradiol compounds) seems to be associated with a slightly increased risk of breast cancer, which is not prevented and may even be increased by the addition of progestins.
Related Papers (5)

Breast cancer and hormone replacement therapy: collaborative reanalysis of data from 51 epidemiological studies of 52 705 women with breast cancer and 108 411 women without breast cancer

Eugenia E. Calle, +194 more
- 11 Oct 1997 - 

Effects of Estrogen or Estrogen/ Progestin Regimens on Heart Disease Risk Factors in Postmenopausal Women: The Postmenopausal Estrogen/Progestin Interventions (PEPI) Trial

Valery T. Miller, +94 more
- 18 Jan 1995 - 
Trending Questions (1)
How can women reduce estrogen and progesterone?

The addition of progestins to estrogen therapy does not reduce the risk of breast cancer among postmenopausal women.