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Hormone Replacement Therapy and Prothrombotic Variants

This study has been completed.
ClinicalTrials.gov Identifier:
First Posted: November 15, 2002
Last Update Posted: December 20, 2012
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
National Heart, Lung, and Blood Institute (NHLBI)
Information provided by (Responsible Party):
University of Washington
To examine in postmenopausal women the potential interactions of hormone replacement therapy with other blood clotting factors on the risk of cardiovascular diseases such as heart attack or stroke.

Cardiovascular Diseases Heart Diseases Cerebrovascular Accident Myocardial Infarction Hypertension

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective

Resource links provided by NLM:

Further study details as provided by University of Washington:

Primary Outcome Measures:
  • Myocardial Infarction or Stroke [ Time Frame: Retrospective ]

Enrollment: 1000
Study Start Date: September 2002
Study Completion Date: August 2008
Primary Completion Date: August 2008 (Final data collection date for primary outcome measure)
Detailed Description:


Estrogens are prothrombotic. Recently, the Heart and Estrogen/progestin Replacement Study (HERS), renewed interest in the adverse effects of hormone replacement therapy (HRT). In HERS, HRT was no better than placebo at preventing coronary events. In post hoc analyses, treatment was associated with early harm and late benefit. In an American Heart Association funded case-control study, a potential interaction was observed between HRT and the prothrombin G20210A variant on the risk of first myocardial infarction (MI) in post-menopausal women with hypertension.


The study has a case-control design. The Group Health Cooperative (GHC) computerized files will be used to identify postmenopausal women, aged 30 to 79 yrs, with incident myocardial infarction (MI) or stroke during 1/2000-12/2004. Population-based controls, sampled from the GHC enrollment files, will be frequency matched to cases by age, calendar year, and treated hypertension. Data collection will include medical-record review, telephone interview of consenting subjects, and venous-blood collection. Standard methods will be used to assay variant alleles. The GHC computerized pharmacy records will serve as the primary source of information about the use of HRT. Data analysis will involve restriction, stratification, and logistic regression. Case-control and case-only analyses are planned. There will be a total of 600 MI cases, 420 stroke cases and 1800 controls.

The primary purpose is to examine the potential interactions of hormone replacement therapy with other procoagulant variants on the risk of cardiovascular events. The main variants of interest are: (la) factor XIIIA Val34Leu; (ib) platelet glycoprotein (PGP) Jib Ile843Ser; (ic) PGP IIIa Leu33Pro; and (id) PGP Ia C807T. The secondary aims include the assessment of other drug-gene, risk-factor-gene or gene-gene interactions on risk: (2a) the interaction between PGP IIb Ser843, PGP lila Leu33Pro and PGP Ia C807T and traditional cardiovascular risk factors such as smoking and obesity on the risk of MI and stroke; (2b) the interaction between three coagulation factor XIII polymorphisms and PAl-1 4G/5G on the risk of stroke in women; and (2c) the interaction between aspirin use and glycoprotein IIIa Leu33Pro on the risk of MI and stroke.


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Ages Eligible for Study:   30 Years to 79 Years   (Adult, Senior)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
No eligibility criteria
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00049933

Sponsors and Collaborators
University of Washington
National Heart, Lung, and Blood Institute (NHLBI)
Study Chair: Bruce Psaty University of Washington
  More Information