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Conor Medsystems, LLC Reports COSTAR II Pivotal Drug-Eluting Stent Trial Conclusions


Menlo Park, CA - Citing issues related to potentially sub-optimal therapeutic dosing of paclitaxel, Conor Medsystems, LLC has concluded that the COSTAR II (CObalt Chromium STent with Antiproliferative for Restenosis) trial, the pivotal study for the CoStar® cobalt chromium paclitaxel-eluting coronary stent, failed to meet its primary endpoint. The trial did not identify safety issues, and the overall rates of death, myocardial infarction and stent thrombosis were consistent with those observed in other clinically relevant drug-eluting stent studies.

As a result of these outcomes, the company will terminate ongoing clinical trials with the CoStar® stent and will not conclude the submission of its Pre-Market Approval application to the U.S. Food and Drug Administration for the product. Further, Conor Medsystems will discontinue sale of the product through commercial partners in certain countries in Europe, Asia and Latin America where the CoStar stent is already approved, and will work with those partners to facilitate return of product in inventory in customer accounts.

The COSTAR II trial compared the CoStar® stent with the Taxus Express(2) paclitaxel drug-eluting stent, and was designed to demonstrate non-inferiority at eight-month follow-up with respect to major adverse cardiac events (MACE) in patients with multi-vessel or single-vessel disease. In this trial, MACE was defined as a composite of clinically driven target vessel revascularization, heart attack (new myocardial infarction) related to the target vessel and cardiac death related to an intervened vessel.

“While we are disappointed in these results, we remain optimistic about the ability of the novel Conor Medsystems reservoir platform to provide precise and controlled delivery of a therapeutic agent based on earlier proof of concept testing and trials,” said Campbell Rogers, M.D., chief technology officer, cardiovascular franchise. “Unfortunately, the dose of paclitaxel used in this trial was ineffective. We expect that the continued development of sirolimus on this platform will demonstrate promising outcomes, because sirolimus has been shown to be a versatile and potent anti-restenosis agent with a wide therapeutic dosing range.”

Sirolimus is the proven drug used with the CYPHER® Sirolimus-eluting Coronary Stent - the most widely studied coronary stent in the world.

“While the safety data from this trial are consistent with other drug-eluting stent studies, it was disappointing that this product did not meet the high standards for efficacy that our product portfolio represents,” said Rick Anderson, Johnson & Johnson Company Group Chairman and worldwide cardiovascular franchise leader. “At the same time, as we have indicated since the acquisition of Conor Medsystems, we are enthusiastic about the development of this platform with a versatile, highly effective drug like sirolimus. Going forward, our clinical program will be heavily focused on the study of sirolimus on the platform, as well as on investigating the vast library of therapeutic agents accessible to our scientists through the research and development programs of pharmaceutical companies in the Johnson & Johnson family of companies.”

Data from the pivotal trial will be presented at the upcoming EuroPCR meeting to be held May 22 to 25 in Barcelona, Spain.


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