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Sponsored by: |
National Heart, Lung, and Blood Institute (NHLBI) |
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Information provided by: | National Heart, Lung, and Blood Institute (NHLBI) |
ClinicalTrials.gov Identifier: | NCT00064545 |
To evaluate common genetic variations, that in combination with exposure to tobacco smoke, may modify the risk of atherosclerosis.
Condition | Phase |
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Atherosclerosis Cardiovascular Diseases Heart Diseases Coronary Disease Carotid Artery Diseases Peripheral Vascular Diseases Cerebral Arteriosclerosis Cerebrovascular Accident |
N/A |
Study Type: | Observational |
Study Start Date: | July 2003 |
Study Completion Date: | June 2008 |
Primary Completion Date: | June 2008 (Final data collection date for primary outcome measure) |
BACKGROUND:
While cigarette smoking is a well-established and potent risk factor for atherosclerotic vascular disease, individual susceptibility to smoking varies considerably, suggesting modifiers such as genomic variation. Several key enzymes involved in the activation and detoxification of mutagenic tobacco smoke compounds, oxidative stress, and DNA damage are expressed in the tissues of the heart and vasculature and represent mechanistic pathways for tobacco-induced pathology. Many of these enzymes have common polymorphisms (greater than or equal too 10% prevalence in the population) with known functional effects. Although restricted to a few enzymes and hampered by shortcomings in design, a small number of studies have suggested that enzymatic activation and detoxification of tobacco smoke modifies the risk of certain cardiovascular outcomes associated with cigarette smoking.
DESIGN NARRATIVE:
The genetic epidemiology study will evaluate common genetic polymorphisms that, in combination with exposure to tobacco smoke, may modify the risk of atherosclerosis and its clinical sequelae. An average of six polymorphisms, selected on the basis of their prevalence and functional significance, expression in relevant tissues, evaluation in previous studies and biologic plausibility, within 19 genes involved in activation, detoxification, oxidative stress, and DNA repair pathways will be evaluated as an ancillary study to the Atherosclerosis Risk in Communities (ARIC) study. In this well-characterized, bi-ethnic cohort of 15,792 men and women under active follow-up since 1987-89 (completeness of follow-up 96%), five endpoints quantifying subclinical atherosclerosis and validated clinical atherosclerotic events will be studied in case-cohort/case-control mode: incident coronary heart disease, carotid atherosclerosis, peripheral arterial disease, incident stroke, and MRI-detected cerebral infarcts. The study is well designed to study how DNA sequence polymorphisms can promote or inhibit the atherogenic effects of smoking and the risk of clinical events, and to contribute new knowledge on the role of genetic variation in the response to environmental insults and toxicants.
A case-cohort or case-control approach will be taken, using data from the Atherosclerosis Risk in Communities (ARIC) study. Approximately 20 polymorphisms will be examined in relation to five cardiovascular disease (CVD) endpoints. The polymorphisms to be examined are classified as variants of either a) Phase I (activation) enzymes, b) Phase II (detoxification) enzymes, c) oxidative stress enzymes, or d) DNA repair enzymes. The CVD endpoints include incident coronary heart disease (CHD) cases (n=1,101), incident stroke cases (n=323), prevalent peripheral artery disease (PAD) (n=237 cases), carotid atherosclerosis determined by MRI (n=504 cases), and cerebral infarcts (n=237cases). Controls will consist of 1,062 controls selected at visit 1, and 237 visit-3 controls for the cerebral infarct cases. The statistical approach will be based on the proportional hazards regression for incident CHD and stroke endpoints, and logistic regression for the other CVD outcomes. Both additive and multiplicative forms of interaction will be tested.
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | No |
No eligibility criteria
Study ID Numbers: | 1227 |
Study First Received: | July 8, 2003 |
Last Updated: | July 23, 2008 |
ClinicalTrials.gov Identifier: | NCT00064545 |
Health Authority: | United States: Federal Government |
Arterial Occlusive Diseases Atherosclerosis Heart Diseases Peripheral Vascular Diseases Cerebral Infarction Myocardial Ischemia Stroke Vascular Diseases Central Nervous System Diseases Ischemia Arteriosclerosis |
Brain Diseases Intracranial Arterial Diseases Cerebrovascular Disorders Coronary Disease Smoking Intracranial Arteriosclerosis Brain Ischemia Brain Infarction Carotid Artery Diseases Infarction Coronary Artery Disease |
Nervous System Diseases Cardiovascular Diseases |