BOSTON SCIENTIFIC

发布于:2008-04-07 14:32

Study Finds Taxus® Drug-Eluting Stent Beneficial in Treatment of Large Vessels – Results from TAXUS IV and V randomized clinical trials favor DES compared to bare-metal stents

April 1, 2008 – Natick, Mass. ans Chicago – Boston Scientific Corporation (NYSE: BSX) today welcomed favorable outcomes of one- year data from the Company’s TAXUS IV and V randomized clinical trials in patients who received the TAXUS® Express™ Paclitaxel-Eluting Coronary Stent System compared to patients who received bare-metal stents (BMS). These results add to the growing body of evidence that paclitaxel-eluting stents are clinically beneficial over BMS even in the treatment of large vessels (greater than 3.5 mm), which typically have reduced restenosis risk compared to smaller diameter vessels. David A. Cox, M.D., FACC, presented the TAXUS IV and V results at the SCAI Annual Scientific Sessions in Partnership with the ACC/i2 Summit in Chicago.

In an analysis of TAXUS IV and V one-year clinical events, Dr. Cox reported that patients treated with the TAXUS Stent had significant reductions in one-year revascularization rates in both large and small diameter vessels compared to BMS. Although the absolute magnitude of the efficacy benefit was reduced in large diameter vessels, the relative reduction compared to BMS was maintained.

Results include outcomes from 2,458 patients divided into three groups according to maximal device diameter (defined as the diameter of the largest final stent or post-dilatation balloon utilized): <3.5 mm (n=1,528 patients), >/=3.5mm-<4.0mm (n=655), and >/=4.0mm (n=275). Compared to BMS, patients treated with the TAXUS Stent had lower rates of target lesion revascularization (TLR) at all device diameters: 9.7% vs. 20.4% (p<0.001) for <3.5mm, 4.5% vs. 13.5% (p<0.001) for >/=3.5mm-<4.0mm, and 1.6% vs. 6.5% (p<0.05) for >4.0mm. These rates correspond to reductions of 52.5% for the <3.5mm group, 66.7% for the >/=3.5mm-<4.0mm group, and 75.4% for the >/=4.0mm group, suggesting that although the magnitude of the absolute TLR difference between TAXUS and BMS was reduced in larger diameter vessels, the relative reduction was actually greater. Significant reductions in target vessel revascularization (TVR) and MACE were also reported in both small and larger diameter vessels. There were no statistically significant differences in the incidences of cardiac death, myocardial infarction or stent thrombosis.

"The risk for restenosis with BMS is generally decreased in large vessels, prompting some interventional cardiologists to choose BMS over DES in vessels larger than 3.5mm. However, since larger vessels also surround significant amounts of heart muscle tissue, even small differences in clinical events between BMS and DES may be clinically relevant," said Dr. Cox. "Our analyses of TAXUS IV and V data clearly add to the growing body of evidence that DES still appear clinically beneficial over BMS in the treatment of large vessels."

The safety and effectiveness of the TAXUS Express Stent has not been established in lesions with reference vessel diameters >3.75mm.

Boston Scientific is a worldwide developer, manufacturer and marketer of medical devices whose products are used in a broad range of interventional medical specialties. For more information, please visit: http://www.bostonscientific.com/

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2008-04-07 14:34:19 by: sarah6012

TAXUS® Stent Demonstrates Similar Outcomes in Diabetic Patients Compared to Non-diabetics in Pooled Analysis of TAXUS IV and V Trials   April 1, 2008 – NATICK, Mass. and CHICAGO – Boston Scientific Corporation (NYSE: BSX) today announced results from a pooled analysis of patients from its TAXUS IV and TAXUS V randomized clinical trials. The analysis compared the safety and efficacy of the TAXUS® Express™ Paclitaxel-Eluting Coronary Stent System in diabetic versus non-diabetic patients. Results demonstrated that despite the known increased rates of mortality and restenosis for diabetics versus non-diabetics in patients with cardiovascular disease(1), the TAXUS Stent had comparable levels of late loss and target lesion revascularization (TLR) across these patient populations. The study also showed no significant differences in target vessel revascularization (TVR), stent thrombosis, or myocardial infarction (MI), after adjustments were made for differences in other baseline characteristics between patients with or without diabetes. Analysis of the data was presented by Gregg W. Stone, M.D., of the Columbia University Medical Center in New York, at the SCAI Annual Scientific Sessions in Partnership with the ACC/i2 Summit in Chicago. "The TAXUS IV/V diabetic subset data indicated that the TAXUS Stent mitigated the impact of diabetes as a risk factor for restenosis following stenting procedures in the patients studied," said Dr. Stone. "Diabetic patients treated with TAXUS Stents compared to bare-metal stents had significantly improved event-free survival, particularly important in high-risk patients with diabetes." The pooled analysis included angiographic outcomes at nine months and clinical outcomes at three years among 338 diabetic patients and 901 non-diabetic patients treated with the TAXUS Stent from the TAXUS IV and V clinical trials. Nine-month angiographic outcomes showed equivalent in-segment late loss (0.27mm vs. 0.31mm, p=0.28) and binary restenosis (14.3% vs. 15.1%, p=0.83) in diabetics and non-diabetics, respectively. At three years, TLR was similar for diabetic and non-diabetic patients (12.4% vs. 10.1%, p=0.25), despite significant baseline differences and increased comorbidity risk in diabetic patients. TVR was higher in diabetics (21.4% vs. 15.7%, p=0.017), due to an increase in remote TVR events (outside the stented segment), which is an indicator of the more aggressive background disease progression in diabetics. Three-year rates of stent thrombosis under Protocol definition (0.9% vs. 1.3%, p=0.63) and ARC Definite/Probable (1.6% vs. 1.9%, p=0.73) were similar, even without multivariate adjustment. The TAXUS IV/V analysis also compared 338 diabetic patients treated with the TAXUS Stent versus 336 diabetic patients treated with bare-metal stents (BMS). Three-year rates of TVR and TLR were reduced by roughly 50 percent in diabetic patients treated with the TAXUS Stent compared to BMS, consistent with results seen in other high-risk patient groups. The TAXUS Stent showed comparable safety to BMS in diabetics, with no significant differences in death (7.3% vs. 7.1%, p=0.91), cardiac death (4.6% vs. 2.7%, p=0.23), MI (6.5% vs. 6.6%, p=0.83) or ARC Definite/Probable stent thrombosis (1.6% vs. 1.5%, p=1.00) in TAXUS and BMS, respectively. "We are pleased to see that TLR in TAXUS patients -- an important indicator of TAXUS efficacy -- showed no significant difference between diabetic and non-diabetic patients in these studies," said Paul LaViolette, Chief Operating Officer at Boston Scientific. "This analysis is consistent with data we recently announced from our ARRIVE 1 and 2 real-world registries, showing that the TAXUS Stent effectively neutralized the impact of diabetes as a risk factor for restenosis in the patients studied." The growing diabetic subset accounts for more than one-quarter of all coronary interventional procedures in the United States. Diabetes is generally associated with an increased risk of cardiovascular events and patients with diabetes are more likely than non-diabetic patients to require repeat procedures due to a higher incidence of restenosis following angioplasty and stenting. The safety and effectiveness of the TAXUS Express Stent has not been established in patients with diabetes in the United States.  For more information, please visit: <A href="http://www.bostonscientific.com/" target=_blank>http://www.bostonscientific.com/</A>

2008-04-07 14:34:19 by: sarah6012