TRITON-TIMI 38 clinical trial, which compared Effient with Plavix(R) (clopidogrel bisulfate) in reducing cardiovascular events in 13,608 acute coronary patients managed with PCI. The study showed that Effient taken with aspirin had a 19 percent relative risk reduction of the combined endpoint of cardiovascular death, non-fatal heart attack or non-fatal stroke versus Plavix taken with aspirin. This benefit was driven predominantly by reduction in heart attacks. The benefit of Effient compared with Plavix was seen as early as three days and continued over the 15 months of the trial. In addition, there were fewer stent-related clots (known as stent thrombosis) in patients treated with Effient compared with Plavix (a relative risk reduction of approximately 50 percent).