Coronary stent thrombosis with vorapaxar versus placebo: results from the TRA 2° P-TIMI 50 trial.
BACKGROUND
Vorapaxar, a novel thrombin receptor antagonist, reduces cardiovascular death and recurrent thrombotic events when added to standard antiplatelet therapy in patients with stable atherosclerotic vascular disease.


OBJECTIVES
The goal of this study was to test the hypothesis that treatment with vorapaxar reduces the rate of coronary stent thrombosis (ST) in stable patients with a history of coronary stenting.


METHODS
TRA 2° P-TIMI 50 (Trial to Assess the Effects of Vorapaxar in Preventing Heart Attack and Stroke in Patients With Atherosclerosis-Thrombolysis In Myocardial Infarction 50) was a multinational, randomized, double-blind, placebo-controlled trial of vorapaxar in stable patients with prior myocardial infarction, peripheral arterial disease, or stroke. We evaluated the rates of definite ST as adjudicated by a central events committee using Academic Research Consortium (ARC) criteria.


RESULTS
A total of 26,449 patients were randomized, with 14,042 (53%) having a history of a coronary stent implantation before randomization, and an additional 449 patients receiving a coronary stent during the trial (total 14,491). During follow-up (median 2.5 years), there were 152 definite ST events, with the majority (92%) occurring late or very late. Vorapaxar reduced ARC definite ST (1.1% vs. 1.4%, hazard ratio [HR]: 0.71, 95% confidence interval [CI]: 0.51 to 0.98; p = 0.037). The reduction was consistent, regardless of time from percutaneous coronary intervention, history of diabetes, use of drug-eluting stents, and use of dual antiplatelet therapy (DAPT) at randomization. Vorapaxar increased GUSTO moderate/severe bleeding (HR: 1.57, 95% CI: 1.26 to 1.94; p < 0.001).


CONCLUSIONS
The rate of ARC definite ST in stable patients, the majority of whom were receiving DAPT, was approximately 1.4% at 3 years. In stable patients with coronary stenting receiving standard antiplatelet therapy, vorapaxar administered for long-term secondary prevention significantly reduced ARC definite ST, including very late ST. (Trial to Assess the Effects of Vorapaxar [SCH 530348; MK-5348] in Preventing Heart Attack and Stroke in Patients With Atherosclerosis [TRA 2° P-TIMI 50] [P04737]; NCT00526474).
['Bonaca|Marc P|MP|', 'Scirica|Benjamin M|BM|', 'Braunwald|Eugene|E|', 'Wiviott|Stephen D|SD|', "O'Donoghue|Michelle L|ML|", 'Murphy|Sabina A|SA|', 'Morrow|David A|DA|']
D000368:Aged D050197:Atherosclerosis D003328:Coronary Thrombosis D004311:Double-Blind Method D054855:Drug-Eluting Stents D005260:Female D005500:Follow-Up Studies D006801:Humans D007783:Lactones D008297:Male D008875:Middle Aged D009203:Myocardial Infarction D011725:Pyridines D018179:Receptors, Thrombin D020521:Stroke
stent antiplatelet therapy DES PAR-1 atherothrombosis thienopyridine