WHITEHOUSE STATION, N.J.--(BUSINESS WIRE)--Merck announced today the completion of patient enrollment in the TRA 2°P-TIMI 50 clinical trial, a Phase III, randomized, double-blind, placebo-controlled, multinational study of SCH 530348, the company’s investigational antiplatelet protease activated receptor-1 (PAR-1) inhibitor. The study, conducted by the Thrombolysis in Myocardial Infarction (TIMI) Study Group, reached its target of more than 26,000 patients.