A comprehensive analysis published today in The Lancet, one of the world's leading medical journals, from the ABSORB clinical trial demonstrated that Abbott's bioabsorbable drug eluting stent, currently in development, successfully treated coronary artery disease and was absorbed into the walls of treated arteries within two years. The two-year data also demonstrated that after the bioabsorbable device was absorbed, the treated blood vessels appeared to move and function similar to unstented arteries. Preliminary findings from the 30-patient ABSORB trial were presented in October 2008 at the Transcatheter Cardiovascular Therapeutics annual meeting in Washington, D.C.
"Abbott's bioabsorbable drug eluting stent leaves behind a vessel that expands and contracts in a manner similar to a vessel that has never been stented, which could be an advantage over permanent metal-based stent implants," said Patrick W. Serruys, M.D., Ph.D., professor of interventional cardiology at the Thoraxcentre, Erasmus University Hospital, Rotterdam, the Netherlands; lead author of The Lancet publication; and co-principal investigator of the first phase of the ABSORB trial. "This bioabsorbable device has the potential to provide optimal vessel scaffolding and drug delivery capability over the crucial first several months after a stenting procedure while avoiding the long-term restrictions of metallic stents."
The ABSORB trial is the world's first clinical trial evaluating a fully bioabsorbable drug eluting coronary stent, and advanced imaging methods were used to assess patient outcomes. As published in The Lancet, the first phase of the ABSORB trial demonstrated the following key results:
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A zero percent rate of stent thrombosis (blood clot formation) for all patients out to two years of follow up.
No new major adverse cardiac events (MACE) between six months and two years. At two years, the bioabsorbable device demonstrated a MACE rate of 3.6 percent (one patient). MACE is defined as any event that resulted in re-treatment of the treated artery lesion, heart attack or cardiac death.
Bioabsorption of the stent at two years after implantation, as confirmed by an assessment of the stent struts using optical coherence tomography (OCT).
Restoration of vasomotion (ability of the blood vessel to contract and expand) was observed at two years, with the drug acetylcholine used in nine patients showing vasodilation in the previously stented area, and the drug methergin used in seven patients showing vasoconstriction in the previously stented area.
Reduction in plaque area in treated arteries, corresponding to an increase in blood flow between six months and two years, as confirmed by intravascular ultrasound (IVUS) and virtual histology.
The ABSORB trial is a prospective, non-randomized (open label), two-phase study designed to enroll approximately 110 patients in Australia, Belgium, Denmark, France, the Netherlands, New Zealand, Poland and Switzerland. Key endpoints of the study include assessments of safety - MACE and stent thrombosis rates - at 30 days, six, nine and 18 months, and one and two years, with additional annual clinical follow-up for up to five years, as well as an assessment of the acute performance of the bioabsorbable drug eluting stent, including successful deployment of the stent. Other key endpoints of the study include imaging assessments by angiography, IVUS, OCT, and other state-of-the-art invasive and non-invasive imaging modalities at six and 18 months, and at one or two years. About XIENCE V
Abbott's market-leading XIENCE V(TM) Everolimus Eluting Coronary Stent System was approved by the U.S. Food and Drug Administration and launched in July 2008, and was launched in Europe and other international markets in October 2006. XIENCE V is an investigational device in Japan and is currently under review by the Ministry of Health, Labour and Welfare and the Pharmaceuticals and Medical Devices Agency. Additional information about XIENCE V, including important safety and effectiveness information, is available online at www.xiencev.com. Everolimus, developed by Novartis Pharma AG, is a proliferation signal inhibitor, or mTOR inhibitor, licensed to Abbott by Novartis for use on its drug eluting stents. Everolimus has been shown to inhibit in-stent neointimal growth in the coronary vessels following stent implantation, due to its anti-proliferative properties. About Abbott Vascular
Abbott Vascular, a division of Abbott, is one of the world's leading vascular care businesses. Abbott Vascular is uniquely focused on advancing the treatment of vascular disease and improving patient care by combining the latest medical device innovations with world-class pharmaceuticals, investing in research and development, and advancing medicine through training and education. Headquartered in Northern California, Abbott Vascular offers a comprehensive portfolio of vessel closure, endovascular and coronary products. About Abbott
Abbott is a global, broad-based health care company devoted to the discovery, development, manufacture and marketing of pharmaceuticals and medical products, including nutritionals, devices and diagnostics. The company employs more than 72,000 people and markets its products in more than 130 countries. Abbott's news releases and other information are available on the company's Web site at www.abbott.com.