Pharmacogenomics of Anti-platelet Intervention-2 (PAPI-2) Study

• Status: Terminated
• Trial end date: 2013-07-01
• Target enrollment: 0
• Participant gender: All

Summary

It is standard treatment to take anti-platelet medication after cardiac catheterization and stent placement to help prevent the formation of blood clots that may cause heart attack or stroke. The most commonly used anti-platelet medicine is clopidogrel (Plavix®). However, researchers have found that people vary in their response to clopidogrel, in part because of differences in their genes. Prasugrel (Effient®)is another anti-platelet medication used to prevent clots. The genetic differences that affect clopidogrel response do not affect prasugrel response. Recently, the FDA added a warning to the label of clopidogrel to notify doctors and patients with certain genetic differences may not get the full benefit from clopidogrel. Despite this, genetic testing for these variations is not usually done in standard medical practice. The purpose of this study is to see if patients with certain gene differences have fewer major cardiac events after stent placement if they are given anti-platelet therapy guided by their individual genetic type compared to standard anti-platelet therapy.

• Phase: Phase 4
• Accepts Healthy Volunteers?: No

Details

• Lead Sponsor: University of Maryland; University of Maryland, Baltimore
• Collaborator: National Heart, Lung, and Blood Institute (NHLBI)
• Treatments: Clopidogrel; Platelet Aggregation Inhibitors; Prasugrel Hydrochloride; Ticlopidine

Criteria

Inclusion Criteria:

• Males or non-pregnant females between the ages of 20 and 74 years, inclusive

• Not more than four days post-PCI (percutaneous coronary intervention) with placement of one or more drug eluting or bare metal stents

• One or more stent(s) delivered with final TIMI 3 flow (thrombolysis in myocardial infarction grade 3) in the stented vessel(s)

• Must have evidence of one of the following:

1. Three vessel disease;

2. Two vessel disease with one of the following: estimated creatinine clearance <60, prior myocardial infarction, diabetes mellitus on treatment, peripheral artery disease, cerebrovascular disease, bifurcation stent, overlapping stents, or total stent deployment length > 40 mm in length;

3. Single vessel disease with two of the following: estimated creatinine clearance <60, prior myocardial infarction, diabetes mellitus on treatment, peripheral artery disease, cerebrovascular disease, bifurcating stenting, overlapping stents, or total stent deployment length > 40 mm in length.

• Patients with acute MI (myocardial infarction) preceding the PCI must have CK-MB (bound combination of creatine kinase M and creatine kinase B) value lower than the prior value, before randomization

• Patients with peri-procedural MI, defined by CK-MB three times greater than upper reference limit (URL), must have CK-MB value lower than the prior value, before randomization. Peri-procedural MI will be screened per clinical suspicion.

• Have an indication for one year of dual anti-platelet therapy with a P2Y12 inhibitor and aspirin

• Agreement of the treating physician to prescribe anti-platelet therapy according to randomization and study dosing algorithm

• Ability to understand and comply with planned study procedures

• Provide written informed consent prior to study entry

• Agrees to authorize the collection and release of his/her medical information for the duration of the trial or until the subject withdraws

Exclusion Criteria:

• History of a gastrointestinal bleed within three months or a major, life threatening bleeding event (e.g., sub-arachnoid or intracranial hemorrhage)

• Active pathological bleeding (e.g. GI bleeding)

• History of bleeding diathesis or coagulopathy

• History of stroke or transient ischemic attack (TIA)

• Non-cardiac surgery within the prior 3 months

• Planned cardiac or non-cardiac surgery within the next 12 months

• CYP2C19 genotype already known to subject or research team from prior genetic testing

• Post-PCI CABG (coronary artery bypass graft) before randomization

• Planned warfarin or dabigatran therapy any time during the study period

• Known allergy to aspirin, clopidogrel or prasugrel

• Platelet count <100,000/mm3

• Hematocrit < 25%

• Pregnancy

• Concurrent enrollment in another trial that involves an investigational stent, antithrombotic or anti-platelet agent

• Any condition that would, in the opinion of the site investigator, place them at an unacceptable risk or render them unable to meet the requirements of the protocol

• Any subject, in the opinion of the investigator, not expected to tolerate or be adherent with one year of dual antiplatelet therapy