Polymer-free sirolimus-eluting stents and polymer-based paclitaxel-eluting stents were associated with comparable risk of death or myocardial infarction ( relative risk = 1.17 ; 95 % confidence interval , 0.49-2 .80 ; P = .71 ) , cardiac death or myocardial infarction ( relative risk = 1.17 ; 95 % confidence interval , 0.72-1 .89 ; P = .50 ) , target lesion revascularization ( relative risk = 0.98 ; 95 % confidence interval , 0.65-1 .47 ; P = .93 ) , and myocardial infarction ( relative risk = 1.79 ; 95 % confidence interval , 0.85-3 .76 ; P = .12 ) .