Adjunctive Cilostazol Versus High Maintenance-dose Clopidogrel According to Cytochrome 2C19 Polymorphism

Study Overview
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Brief Summary
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The purpose of this study is to determine the impact of adjunctive cilostazol versus high maintenance-dose clopidogrel on platelet inhibition in carriers and non-carriers of the loss-of-function CYP2C19 mutant allele.

Detailed Description
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The additional platelet inhibition with clopidogrel, a thienopyridine inhibitor of the platelet P2Y12 adenosine diphosphate (ADP) receptor, has reduced the risk of ischemic events after coronary stent implantation. Because of inter-individual variability in platelet response to clopidogrel, a significant proportion of suboptimal platelet inhibition has been reported. In addition, persistent residual platelet reactivity measured with platelet function testing has shown the association with the cardiovascular outcomes after percutaneous coronary intervention (PCI). Various clinical factors and genetic polymorphisms have been studied to predict the degree of antiplatelet response to clopidogrel. Interestingly, recent studies found that carriers of the loss-of-function hepatic cytochrome (CYP) 2C19 allele had significantly lower levels of the active metabolite of clopidogrel, diminished platelet inhibition, and a higher rate of major adverse cardiovascular events than did non-carriers, in the setting of PCI and acute coronary syndrome (ACS). These findings raise the need of solutions to overcome enhanced post-clopidogrel platelet reactivity by the influence of the loss-of-function CYP2C19 allele. Increasing the dose of clopidogrel and new potent P2Y12 antagonists (such as prasugrel) may be alternative antiplatelet regimens in patients with the loss-of-function CYP variant. Cilostazol reversibly induces platelet inhibition via its blockade of phosphodiesterase (PDE) type 3 and is catalysed mainly by CYP3A. A recent study demonstrated that adjunctive cilostazol to dual antiplatelet therapy (triple antiplatelet therapy) intensified platelet inhibition as compared with a high maintenance-dose (MD) of 150 mg/day. Therefore, triple antiplatelet therapy could also be an alternative antiplatelet therapy to improve platelet inhibition and clinical outcomes in carriers of CYP2C19 mutant allele. We compared the enhanced inhibition of platelet aggregation by adjunctive cilostazol 100 mg twice daily versus high-MD clopidogrel 150 mg/day in patients treated with elective coronary stenting, according to the CYP2C19 polymorphism.

Official Title
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CYP 2C19 Polymorphism and Response to Adjunctive Cilostazol and High Maintenance-dose Clopidogrel in Patients Undergoing Elective Percutaneous Coronary Intervention

Conditions
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Coronary Artery Disease, Percutaneous Coronary Intervention

Intervention / Treatment
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* Drug: cilostazol 100mg bid or clopidogrel 150-mg daily


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Significant coronary artery stenosis (>70% by visual estimate) Elective coronary stent implantation Exclusion Criteria: Acute myocardial infarction Active bleeding and bleeding diatheses Hemodynamic instability Oral anticoagulation therapy with warfarin Use of peri-procedural glycoprotein IIb/IIIa inhibitors Contraindication to antiplatelet therapy Left ventricular ejection fraction < 30% Leukocyte count < 3,000/mm3, platelet count < 100,000/mm3, AST or ALT ≥ 3 times upper normal Serum creatinine level ≥ 3 mg/dL Stroke within 3 months Noncardiac disease with a life expectancy < 1 year Inability to follow the protocol

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: adjunctive cilostazol<br>adjunctive cilostazol 100mg bid to dual antiplatelet therapy | Drug: cilostazol 100mg bid or clopidogrel 150-mg daily<br>* Adjunctive cilostazol: cilostazol 100-mg bid +clopidogrel 75mg daily+aspirin 200mg daily High-MD clopidogrel: clopidogrel 150mg daly +aspirin 200mg daily<br>|
| Active Comparator: high maintenance-dose clopidogrel<br>double dose of clopidogrel 150mg/day | Drug: cilostazol 100mg bid or clopidogrel 150-mg daily<br>* Adjunctive cilostazol: cilostazol 100-mg bid +clopidogrel 75mg daily+aspirin 200mg daily High-MD clopidogrel: clopidogrel 150mg daly +aspirin 200mg daily<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Reduction of maximal platelet aggregation according to CYP 2C19 polymorphism |  | 30-day therapy | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Reduction of late platelet aggregation, reduction of P2Y12 reaction unit, and the rate of high post-clopidogrel platelet reactivity according to CYP 2C19 polymorphism |  | 30-day therapy | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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adjunctive cilostazol, high-MD clopidogrel, CYP 2C19 polymorphism, high risk patients