Meta-Analysis Shows Big Advantage for Biodegradable Stent Polymers
[Biosensors International is publicly traded in Singapore. (It nominally trades on the US pink sheets under the ticker, BSNRF.PK, but there is no volume to speak of.) Biosensors’ polymer technology was used by a company called Xtent that went bankrupt in 2009 (#msg-37869837), but Biosensors is now developing its own DES using a proprietary drug from the same class as sirolimus and everolimus. (Thanks to ‘aslan2772’ for this find.)]
›Drug-Eluting Stents Using Biodegradable Polymer Significantly Improve Overall Clinical Outcomes And Reduce Stent Thrombosis
Source: Biosensors International 26 May 2011
Drug-eluting stents (DES) using a biodegradable polymer significantly improve overall clinical outcomes and reduce stent thrombosis by 50% compared with DES using a durable polymer over a three-year period. These were the findings from a new independent patient-level meta-analysis involving over 4,000 patients, presented at EuroPCR last week.
The incidence of the composite primary endpoint (cardiac death, MI or clinically-indicated target vessel revascularization) at three years was significantly lower in the biodegradable polymer DES-treated group than in the durable polymer DES-treated group (18.2 % vs. 20.1%: p=0.04).
Rates of definite stent thrombosis at three years were also significantly lower in the biodegradable polymer DES-treated group than in the durable polymer DES-treated group (1.2% vs. 2.1%: p=0.013).
The meta-analysis involved pooling three-year outcome data from the three largest published randomized clinical trials comparing biodegradable polymer DES with durable polymer sirolimus-eluting DES: LEADERS, ISAR-TEST 3 and ISAR-TEST 4. LEADERS used a biolimus-eluting stent with abluminal biodegradable polymer (BioMatrix Flex™); the two ISAR-TEST trials used a sirolimus-eluting stent with biodegradable polymer. In total, 4,062 patients were included: 2,358 treated with a biodegradable polymer DES and 1,704 with a durable polymer sirolimus-eluting DES.
"This new analysis involving the LEADERS data is particularly gratifying", commented Biosensors CEO Jeffrey B. Jump. "As the company who pioneered the development of biodegradable polymers for drug-eluting stents, we are delighted that our belief in their long-term patient benefits is being borne out."
The LEADERS study was the first head-to-head randomized trial between two limus-eluting stents, Biosensors' Biolimus A9™-eluting stent system with abluminal biodegradable polymer and Cordis' sirolimus-eluting stent system with durable polymer, in an "all-comers" patient population using clinical outcomes. BioMatrix Flex was shown to be non-inferior to Cypher Select in terms of its primary endpoint, MACE (a composite of cardiac death, myocardial infarction, or clinically-indicated target vessel revascularization) at nine months. Three-year results for LEADERS suggested a strong trend towards a significantly lower MACE rate for BioMatrix Flex compared to results at both one and two years.
The BioMatrix Flex stent system offers the unique combination of Biolimus A9™ (BA9™), an anti-restenotic drug developed and patented by Biosensors specifically for use with drug-eluting stents, combined with a biodegradable poly-lactic acid (PLA) polymer abluminally coated onto an advanced, highly flexible stent platform designed for enhanced deliverability. BA9 has the highest lipophilic profile of the common limus drugs, enabling rapid absorption by the tissue and minimizing systemic exposure. The PLA polymer fully degrades into carbon dioxide and water over six to nine months as it releases BA9.‹
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