Background: Biolimus-eluting stents (BESs) with a biodegradable polymer in abluminal coating achieve more complete coverage at 9 months compared with sirolimus-eluting stents (SESs) with a durable polymer, as assessed by optical coherence tomography (OCT). Whether this advantage persists or augments after complete resorption of the polymer (>12 months) is unknown. Methods: The LEADERS trial compared the performance of BES with that of SES. Patients were randomly allocated to a sequential angiographic follow-up, including OCT in selected sites, at 9 and 24 months. Struts coverage was compared using Bayesian hierarchical models as the primary outcome for the OCT substudy. Results: Fifty-six patients (26 BES, 30 SES) were enrolled in the OCT substudy. Twenty-one patients (10 BES, 11 SES) agreed to perform a second OCT follow-up at 24 months. Eleven lesions and 12 stents were analyzed sequentially in the BES group (2,455 struts at 9 months, 2,131 struts at 24 months) and 11 lesions and 18 stents in the SES group (3,421 struts at 9 months, 4,170 struts at 24 months). The previously reported advantage of BES over SES in terms of better strut coverage at 9 months was followed by improvement in coverage of the SES, resulting in identical coverage in both BES and SES at 24 months: 1.5% versus 1.8% uncovered struts, difference -0.2%, 95% credibility interval, -3.2% to 2.6%, P =.84. Conclusions: More complete strut coverage of BES as compared with SES at 9 months was followed by improvement of coverage in SES between 9 and 24 months and a similar long-term coverage in both stent types at 24 months.

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Keywords BES, DES, ISA, IVUS, MLA, NIH, OCT, PLA, QCA, SES, biolimus-eluting stent, drug-eluting stent, incomplete stent apposition, intravascular ultrasound, minimal lumen area, neointimal hyperplasia, optical coherence tomography, polylactic acid, quantitative coronary angiography, sirolimus-eluting stent
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Gutiérrez-Chico, J.L, Jùni, P, Garcia-Garcia, H.M, Regar, E.S, Nüesch, E, Borgia, F, … di Mario, C. (2011). Long-term tissue coverage of a biodegradable polylactide polymer-coated biolimus-eluting stent: Comparative sequential assessment with optical coherence tomography until complete resorption of the polymer. American Heart Journal, 162(5), 922–931. doi:10.1016/j.ahj.2011.09.005