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Endogenous Estrogen and Coronary Heart Disease in Women

2014-07-24 14:35:33 | BioPortfolio

Summary

To investigate the relation between endogenous levels of estrogen in postmenopausal women and the subsequent development of coronary heart disease.

Description

BACKGROUND:

Studies suggest that estrogen replacement therapy (ERT) lowers the risk of coronary heart disease in postmenopausal women. However, it is not known whether higher endogenous levels of estrogens in the postmenopausal period likewise have a protective effect.

DESIGN NARRATIVE:

The study used an existing resource of frozen blood samples from a cohort of 7,058 postmenopausal women enrolled between 1985 and 1991 for a study of endogenous hormones and cancer. The cohort was followed up to identify incident cases of coronary heart disease. One hundred thirty cases of coronary heart disease (defined as nonfatal myocardial infarction or death from coronary heart disease) were expected to occur by the end of follow-up. A nested case-control study was conducted in which each case was matched to two women from the cohort who were the same age as the case, donated blood around the same time, and were alive and free of heart disease as of the date of diagnosis of the case. Frozen serum samples from cases and their matched controls were analyzed for total estradiol, bioavailable estradiol (the estradiol fraction not bound to sex hormone binding globulin) estrone, total cholesterol, and high- and low-density lipoprotein cholesterol. Conditional logistic regression for matched sets were employed to determine whether estrogen levels were lower in the cases than their matched controls. The association between estrogen levels and cholesterol fractions was also investigated.

Study Design

Observational Model: Natural History

Conditions

Cardiovascular Diseases

Status

Completed

Source

National Heart, Lung, and Blood Institute (NHLBI)

Results (where available)

View Results

Links

Published on BioPortfolio: 2014-07-24T14:35:33-0400

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