OCT Evaluation of Healing of COMBO Stent (EGO-COMBO)
|Coronary Restenosis Coronary Thrombosis||Device: COMBO Stent (OrbusNeich Medical, Fort Lauderdale, Florida)||Phase 1 Phase 2|
|Study Design:||Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: Single (Outcomes Assessor)
Primary Purpose: Treatment
|Official Title:||Evaluation of Neointimal Healing of Endothelial Progenitor Cell Capturing Sirolimus-Eluting (COMBO) Stent by Optical Coherence Tomography: the EGO-COMBO Pilot Study|
- Primary end-point: OCT findings on percentage stent strut coverage in the 2nd to the 5th months (4 monthly groups). [ Time Frame: On 2nd, 3rd, 4th, and 5th months ]Primary end-point: OCT findings on percentage stent strut coverage, malapposition, and neointimal thickness in the 2nd to the 5th months (4 monthly groups).
- OCT findings on late loss (neointimal thickness and neointimal area) at 9 months restudy. [ Time Frame: 9 months ]OCT findings on late loss (neointimal thickness, neointimal area, percentage plaque volume, lumen area, and late loss in lumen area) at 9 months restudy.
- Major Adverse Cardiac Events [ Time Frame: Initial OCT follow up, 9 months follow up and one year follow up ]
Major Adverse Cardiac Events (MACE) which defined as:
- Death from all cause including cardiac death
- Any Myocardial Infarction (Q wave and non Q-wave)
Elevation of post-procedure CK levels to greater 2 times normal without new Q waves is considered a non Q-wave MI.
Development of new, pathological Q waves in 2 or more contiguous leads,as assessed by the investigator and confirmed by the Clinical Endpoint Committee and elevation of cardiac enzymes. In the absence of ECG data the CEC may adjudicate Q wave MI based on the clinical scenario and appropriate cardiac enzyme data.
- Major Adverse Cardiac Events [ Time Frame: Initial OCT follow up, 9 months OCT follow up and one year follow up ]3. Target Lesion Revascularization requiring repeat PCI or CABG to the target lesion. Clinically driven Revascularization at the target lesion associated with positive functional ischemia study or ischemic symptoms AND an angiographic minimal lumen diameter stenosis ≥50% by QCA, or revascularization of a target lesion with diameter stenosis ≥ 70% by QCA without either angina or a positive functional study.
- Any Stent Thrombosis according the Academic Research Consortium [ Time Frame: Initial OCT follow up, 9 months OCT follow up and one year follow up ]
- Stroke [ Time Frame: Initial OCT follow up, 9 months OCT follow up and one year follow up ]Stroke defined as sudden onset of vertigo, numbness, dysphasia, weakness, visual field defects, dysarthria or other focal neurological deficits due to vascular lesions of the brain such as hemorrhage, embolism, thrombosis, or rupturing aneurysm, that persists more than 24 hours.
- Bleeding complication [ Time Frame: Initial OCT follow up, 9 months OCT follow up and one year follow up ]Bleeding complication defined as a procedure related hemorrhagic event that requires a transfusion or surgical repair. These may include a hematoma requiring treatment of retroperitoneal bleed.
|Study Start Date:||October 2010|
|Study Completion Date:||June 2012|
|Primary Completion Date:||June 2012 (Final data collection date for primary outcome measure)|
Experimental: COMBO Stent
Device: COMBO Stent (OrbusNeich Medical, Fort Lauderdale, Florida)
The COMBO Stent is a hybrid version of the GENOUS Stent. Upon implantation to the coronary artery, the stent will deliver a drug (sirolimus) to the wall of the treated segment to suppress neointimal growth, in addition to the anti-CD34 antibody coating which will in theory attract circulatory endothelial progenitor cells to hasten endothelialization and promote healing of the stented segment, and thereby may reduce late stent thrombosis.
Other Name: COMBO Stent
Hide Detailed Description
The GENOUS Stent (the EPC Capturing R-stent, OrbusNeich Medical Inc., Fort Lauderdale, FL) is commercially available and has been extensively used in standard coronary intervention procedures treating >200 patients with critical coronary stenoses at Queen Mary Hospital. The COMBO Stent (OrbusNeich Medical Inc., Fort Lauderdale, FL) is a hybrid version of the GENOUS Stent with an abluminal sirolimus coating, and is currently under the investigational use for clinical research in the REMEDEE Study; over 20 patients have been treated and all remained in good condition since the treatment.
The GENOUS Stent is a bio-engineered 316L stainless steel coronary stent with a biocompatible circumferential coating of anti-CD34 antibody, and will bind to and therefore capture the circulatory endothelial progenitor cells (EPC) which have CD34 antigen on the surface. Immobilization of EPCs on the stent surface will encourage differentiation and proliferation of the EPCs into endothelial and neointimal layer. Animal model has demonstrated that a functional endothelial layer could be formed as soon as 24 to 48 hours after GENOUS stent implantation (1). The HEALING-FIM registry has shown that GENOUS stent is clinically safe and effective in the treatment of coronary stenosis (2). Recent reports have further confirmed its efficacy in patients with acute coronary syndrome requiring urgent revascularization (3,4).
The COMBO Stent is a hybrid version of the GENOUS Stent, with an additional abluminal, drug eluting sirolimus coating, targeted to reduce excessive neointima formation, while maintaining the EPC capturing capacity and therefore continue to promote healing after stent injury. The hybrid function of these two technologies in this new COMBO stent is expected to produce better clinical results in terms of accelerated healing, less stent thrombosis and less restenosis; these are being investigated in the current REMEDEE Study.
Animal study has shown the COMBO Stent promotes endothelialization and reduces neointima formation, as assessed by both optical coherence tomography (OCT) and histopathology (5). Even though COMBO Stents have been used and found to be safe in over 180 patients world-wide and in about 30 patients at Queen Mary Hospital under the REMEDEE Study Protocol, such benefits of "early" endothelial coverage as assessed by OCT has never been fully documented in human subjects.
The current EGO-COMBO study protocol is designed based on the approved protocols of the ongoing REMEDEE Study (IRB: UW 09-384) and the EGO Study (IRB: UW 10-256); both are still active in this Hospital. In the multi-center REMEDEE Study, the COMBO stent is compared to the TAXUS stent (Boston Scientific) in patients with coronary artery disease requiring stent implantation, looking at the 9 months late loss results. This EGO-COMBO Study is different from the REMEDEE Study and focuses mainly on the very early time frames assessing the degree of early neointimal healing (enhanced endothelialization) between 2nd to 5th months, and the subsequent neointimal proliferation at 9 months after the COMBO Stent implantation, as assessed by the very high resolution of the frequency domain optical coherence tomography (OCT) used in the existing EGO study. This is a single centre, non-randomized, open-label study.
Intracoronary frequency domain optical coherence tomography (FD-OCT) is a simple catheter-based imaging technique using optic fibre to achieve very detailed assessment (resolution down to 10 microns) of the stents, in terms of stent apposition, early neointimal coverage (enhanced endothelialization) and late stent neointimal growth (restenosis). It is performed as part of the routine cardiac catheterization procedure and provides high-resolution cross sectional images of the coronary arteries. OCT has been shown to be safe in clinical practice (6, 7). The LightLab C7XR OCT System (Frequency Domain OCT) is a commercially available product with CE Mark and FDA approval, and is being used in our EGO Study. The Dragonfly OCT catheter used is a non-occlusive optic fibre which is extremely small and flexible, and will pose absolutely no additional risk to the patient under treatment, other than those inherent risks of a standard angioplasty procedure.
In this prospective, pilot study, OCT is used to image the COMBO Stent after implantation to evaluate both the early healing (stent apposition, neointimal coverage) and late lumen loss (neo-intimal thickness and neo-intimal area). Clinical outcomes will also be monitored as secondary end points. The OCT analyses will be performed by an USA based core laboratory, which is blinded from the time frame of the OCT pullbacks and the clinical details.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01274234
|Division of Cardiology, Queen Mary Hospital, The University of Hong Kong|
|Hong Kong, Hong Kong|
|Principal Investigator:||Stephen Lee, MD FRCP FACC||Queen Mary Hospital, The Unversity of Hong Kong|