Health Professionals Follow-up Study
|ClinicalTrials.gov Identifier: NCT00005182|
Recruitment Status : Completed
First Posted : May 26, 2000
Last Update Posted : February 28, 2018
|Condition or disease|
|Cardiovascular Diseases Cerebrovascular Accident Coronary Disease Peripheral Vascular Diseases Heart Diseases Myocardial Infarction|
The diet-heart hypothesis, that high dietary saturated fat and cholesterol intake increase the risk and high polyunsaturated fat reduces the risk of coronary heart disease in man is supported by ecologic studies, by experiments in rodents and non-human primates, by voluminous literature relating dietary factors to serum lipids, by several secondary prevention trials, and by the Lipid Research Clinics Trial demonstrating a reduction in coronary heart disease among participants assigned to cholestyramine.
Despite the substantial scientific interest and the obvious public health implications of the diet and heart disease issue, relatively few observational cohort or case-control investigations had been published prior to 1985. Although these observational studies were not entirely consistent, taken collectively, they tended to provide important general support for the diet-heart hypothesis. However, due to study design, limited numbers of endpoints, or methods of analysis, many central questions remained unanswered. The most important issue was the quantitative relationship between specific dietary factors and risk of coronary heart disease. Moreover, the interplay of dietary and genetic factors is poorly understood.
In this prospective cohort study, participants completed a mailed general medical and health questionnaire at baseline and an intensively validated semiquantitative food frequency questionnaire (SFFQ). At one year, tissue specimens were collected and catalogued for future nested case-control analyses of coronary heart disease risk in relation to levels of calcium, selenium, and chromium. Follow-up questionnaires to update exposure information and ascertain non-fatal endpoints were mailed at two-year intervals. All reported cases of non-fatal myocardial infarction, stroke, and cancer were documented with hospital records and/or pathology reports. Fatal events were ascertained with the National Death Index and documented. To standardize SFFQ nutrient scores against measurements of absolute intake, two one-week diet records were obtained from a random sample of 150 Boston-area participants.
The study was renewed in 1991, 1997, and in 2003 to continue the follow-up of 51,529 male health professionals. The cohort is followed by questionnaires mailed at two-year intervals to update exposure information and ascertain nonfatal events. Complete dietary assessments are included every four years.A subset of 18,225 participants provided blood samples between 1993 and 1995. Genotyping was performed among 435 cardiovascular disease cases and 878 controls using Affymetrix 6.0 platform.
|Study Type :||Observational|
|Actual Enrollment :||50000 participants|
|Study Start Date :||December 1985|
|Actual Primary Completion Date :||May 2008|
|Actual Study Completion Date :||May 2008|
- Incident CVD [ Time Frame: Renewed every 5 years since 1986 ]
Biospecimen Retention: Samples With DNA
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00005182
|Principal Investigator:||Eric Rimm||Harvard School of Public Health|