5-year clinical outcomes after sirolimus-eluting stent implantation insights from a patient-level pooled analysis of 4 randomized trials comparing sirolimus-eluting stents with bare-metal stents.

OBJECTIVES: Five-year clinical follow-up has been scheduled per protocol by the 4 Cypher (Cordis/Johnson & Johnson, Warren, New Jersey) sirolimus-eluting stent (SES) versus bare-metal stent (BMS) randomized trials.

BACKGROUND: A delayed arterial healing response after drug-eluting stent implantation has raised concerns about the long-term safety of drug-eluting stents.

METHODS: In a pooled analysis of 4 randomized trials, 1,748 patients were assigned to receive either an SES (n = 878) or BMS (n = 870).

RESULTS: At 5 years, there was no significant difference in the rate of death, myocardial infarction (MI), or the composite of death/MI between the 2 groups (15.1% in the SES group vs. 13.6% in the BMS group; p = 0.36). The 5-year incidence of stent thrombosis by the Academic Research Consortium definition did not differ between SES and BMS (definite/probable stent thrombosis, 2.1% vs. 2.0%; p = 0.99). The incidence of very late stent thrombosis was also similar between the SES and BMS groups (1.4% vs. 0.7%; p = 0.22). The annualized rates of definite/probable stent thrombosis after 1 year were 0.4% for SES and 0.2% for BMS. The 5-year incidence of target vessel revascularization was significantly lower in the SES group (15.2% vs. 30.1%; p < 0.0001).

CONCLUSIONS: In this patient-level pooled analysis, overall use of SES compared with BMS demonstrated persistent superior efficacy at 5 years in terms of a reduction in target vessel revascularization, without an increase in rates of death, MI, or stent thrombosis. (The Initial Double-Blind Drug-Eluting Stent vs Bare-Metal Stent Study, NCT00233805; The Study of the BX Velocity Stent in the Treatment of De Novo Artery Lesions, NCT00381420; Study of Sirolimus-Coated BX VELOCITY Balloon-Expandable Stent in Treatment of de Novo Native Coronary Artery Lesions [SIRIUS], NCT00232765; The Study of the BX VELOCITY Stent In Patients With De Novo Coronary Artery Lesions, NCT00235144).