Pharmacogenomics of Antiplatelet Response - I
Kata kunci
Abstrak
Deskripsi
The main goal of this study is to explore the impact of the PEAR1 genetic variant (rs12041331) on responsiveness to clopidogrel. The investigators will further assess the role of other genetic variants in determining the response to single or dual anti-platelet therapy. Apparently healthy subjects (N= 2108) from high-risk families are being (a) identified from a proband with early-onset CAD and (b) genotyped on the Illumina 1 million platform, with imputation to 2.5 million single nucleotide polymorphisms. The investigators plan to characterize the variance in platelet aggregation to multiple agonists (ADP, collagen, and arachidonic acid) after 1-week therapy with clopidogrel in a high-risk subset of GeneSTAR subjects (N=100). The investigators further plan to determine the extent to which variants identified in the PEAR1 gene modify platelet responsiveness to inhibition by clopidogrel in this high-risk subset. In addition, the investigators aim is to determine the extent to which variants in other recently discovered genes, by themselves, and in combination with PEAR1, modify platelet responsiveness to clopidogrel alone and with aspirin in this high-risk subset. Lastly, the investigators also want to determine what changes in platelet mRNA are produced by aspirin alone and by aspirin with clopidogrel.
tanggal
| Terakhir Diverifikasi: | 10/31/2016 |
| Pertama Dikirim: | 03/17/2013 |
| Perkiraan Pendaftaran Telah Dikirim: | 03/18/2013 |
| Pertama Diposting: | 03/19/2013 |
| Pembaruan Terakhir Dikirim: | 11/09/2016 |
| Pembaruan Terakhir Diposting: | 01/08/2017 |
| Tanggal hasil pengiriman pertama: | 07/31/2016 |
| Tanggal hasil QC pertama kali dikirim: | 11/09/2016 |
| Tanggal hasil posting pertama: | 01/08/2017 |
| Tanggal Mulai Studi Sebenarnya: | 09/30/2012 |
| Perkiraan Tanggal Penyelesaian Utama: | 05/31/2014 |
| Perkiraan Tanggal Penyelesaian Studi: | 05/31/2014 |
Kondisi atau penyakit
Intervensi / pengobatan
Drug: Clopidogrel
Drug: Clopidogrel
Tahap
Kelompok Lengan
| Lengan | Intervensi / pengobatan |
|---|---|
| Experimental: Clopidogrel Clopidogrel 75 mg daily by mouth for 1 week then Clopidogrel 75 mg daily with aspirin 81 mg daily | Drug: Clopidogrel Clopidogrel 75 mg daily |
Kriteria kelayakan
| Usia yang Layak untuk Belajar | 45 Years Untuk 45 Years |
| Jenis Kelamin yang Layak untuk Belajar | All |
| Menerima Relawan Sehat | Iya |
| Kriteria | Inclusion Criteria: - Participants from the GeneSTAR cohort - Unaffected with no overt coronary artery disease or serious vascular event (stroke or peripheral vascular disease diagnosis - Presence of an occult coronary artery disease phenotype as defined by coronary artery calcium scores about the MESA (Multiethnic Study of Atherosclerosis) 75th percentile for age sex, and race or ≥ 1 stenoses in any of the major coronary arteries or main branches of > 50%, or coronary plaque volumetric scores above our own 75th percentile, or any combination on cardiac computed tomographic angiography (performed recently as part of the GeneSTAR study and present for all persons being recruited)/ - Presence of occult cerebrovascular disease defined as presence of white matter hyperintensities (WMH) thought to represent ischemic small vessel cerebrovascular disease, and /or the presence of lacunes (old small strokes), or the presence of an Atherosclerosis Risk in Communities Study (ARIC) silent stroke score on a visual analogue scales of 4 or more (on a scale of 0-9). - Women who are postmenopausal. - Women who use a reliable contraceptive method; a reliable contraceptive method will be defined as personal history of tubal ligation, ongoing use of intra-uterine device, or ongoing use of oral contraceptive pills. Exclusion Criteria: - Presence of any CAD or stroke, transient ischemic attacks, peripheral arterial disease - Persons taking aspirin, NSAIDS, or any anti-coagulants who are medically unable to stop them for a two week pre-trial - A history of allergy to aspirin or clopidogrel - Weight < 60kg - Age < 45 and > 75 years of age - A history of recent or any active bleeding - Serious or current co-morbidity (AIDS, cancer) - Pregnant women as determined by urine dipstick pregnancy test - Any aneurysms on cranial magnetic resonance imaging/magnetic resonance angiography (obtained recently in the GeneSTAR participants) - Blood pressure above >=159/95mmHg - History of a gastric or duodenal ulcer, or significant gastrointestinal disease, like regional enteritis - Mental incompetence to make a decision to participate (developmentally disabled, and persons with diagnosed psychiatric disorders-documented in primary care records). |
Hasil
Ukuran Hasil Utama
1. Difference in ADP-induced Platelet Aggregation [at baseline and at 1 week]
Ukuran Hasil Sekunder
1. Difference in Arachidonic Acid-induced Platelet Aggregation [At baseline and after 1-week]
2. Difference in Collagen-induced Platelet Aggregation [At Baseline and at 1 week]
3. Changes in Platelet Transcriptome With Clopidogrel [At baseline and at 1 week]
