Vascular Disease Clinical Trial
Official title:
Genomics of In-Stent Restenosis: Endarterectomy Study
This study, conducted in Argentina at the Hospital Espa ol de la Plata and the Hospital
Franc s de Buenos Aires, in collaboration with the NHLBI, will investigate possible genetic
factors that lead to in-stent restenosis. A stent is a wire mesh tube that is surgically
placed to open a blocked artery. The stent stays in the artery permanently, holding it open
to improve blood flow. In the case of blocked coronary arteries, the stent improves blood
flow to the heart muscle, relieving symptoms such as chest pain and shortness of breath.
Sometimes re-growth of tissue within a stent, called in-stent restenosis, leads to narrowing
of the artery, decreased blood flow, and a recurrence of symptoms. Genetic analysis may
allow the identification of patient that may be at increased risk for in-stent restenosis
and lead to methods of prevention and treatment.
Patients 18 years of age and older who are undergoing coronary endarterectomy (surgery to
remove plaque from an artery) to treat in-stent restenosis at the Hospital Espa ol de la
Plata and the Hospital Franc s de Buenos Aires may be eligible for this study.
Participants will have a blood sample drawn and undergo coronary endarterectomy. Tissue
removed from the patient's artery or the stent during surgery will be analyzed for gene
expression profiling and genotyping. The results will be studied along with information
about the patients' medical history.
Our laboratory is investigating the genetic basis of the vascular disease, in-stent
restenosis. We hypothesize that patients with in-stent restenosis have abnormal expression
of cell cycle regulatory and inflammatory genes that lead to accelerated development of
vascular lesions following angioplasty, and that there is a genetic component underlying
individual differences to vascular injury. We are conducting an investigation of human
subjects with in-stent restenosis, entitled the CardioGene Study. The objective of the
CardioGene study is to identify the genetic profile of patients at risk for in-stent
restenosis. The CardioGene study completed enrollment of 465 patients in December 2004.
Analysis of blood gene expression profiles, proteomic and genotyping data is currently
ongoing. All analyses are conducted using peripheral blood. Concurrent analysis of
restenosis tissue samples would be valuable in defining the molecular genetics of the
disease.
In this complementary study of endartectomy tissues, we will collect diseased restenosis
tissues removed from patients as part of their routine clinical care. We will also collect
blood at the time of tissue harvesting for genomic analysis, in addition to clinical data.
Genomic data will be compared to the CardioGene study findings, for the purposes of
validation as well as more detailed understanding of the biology of restenosis, by
investigation the molecular mechanisms of restenosis in the tissue samples.
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