Benefits of Icosapent Ethyl Across the Range of Kidney Function in Patients with Established Cardiovascular Disease or Diabetes: REDUCE-IT RENAL
Background: Chronic kidney disease is associated with adverse outcomes among patients with established cardiovascular disease (CVD) or diabetes. Commonly used medications to treat CVD are less effective among patients with reduced kidney function. Methods: The Reduction of Cardiovascular Events with Icosapent Ethyl-Intervention Trial (REDUCE-IT) was a multicenter, double-blind, placebo-controlled trial that randomized statin-treated patients with elevated triglycerides (135-499 mg/dL) who had CVD or diabetes and one additional risk factor to treatment with icosapent ethyl (4 grams daily) or placebo. Patients from REDUCE-IT were categorized by prespecified eGFR categories to analyze the effect of icosapent ethyl on the primary endpoint (composite of cardiovascular [CV] death, nonfatal myocardial infarction nonfatal stroke, coronary revascularization, or unstable angina) and key secondary endpoint (a composite of CV death, nonfatal myocardial infarction, or nonfatal stroke). Results: Among the 8179 REDUCE-IT patients, median baseline eGFR was 75 mL/min/1.73m 2 (range: 17 to 123 mL/min/1.73m 2 ). There were no meaningful changes in median eGFR for icosapent ethyl versus placebo across study visits. Treatment with icosapent ethyl led to consistent reduction in both the primary and secondary composite endpoints across baseline eGFR categories. Patients with eGFR<60 mL/min/1.73m 2 treated with icosapent ethyl had the largest absolute and similar relative risk reduction for the primary composite endpoint (icosapent ethyl versus placebo, 21.8% versus 28.9%, hazard ratio [HR] 0.71, 95% confidence interval [CI] 0.59-0.85, P=0.0002) and key secondary composite endpoints (16.8% versus 22.5%, HR 0.71, 95% CI 0.57-0.88, p=0.001). The numerical reduction in CV death was greatest in the eGFR <60 mL/min/1.73m 2 group (icosapent ethyl: 7.6%; placebo: 10.6%; HR 0.70, 95% CI 0.51-0.95, P=0.02). While patients with eGFR <60 mL/min/1.73m 2 treated with icosapent ethyl had the highest numerical rates of atrial fibrillation/flutter (icosapent ethyl: 4.2%; placebo 3.0%; HR 1.42, 95% CI 0.86-2.32, P=0.17) and serious bleeding (icosapent ethyl: 5.4%; placebo 3.6%; HR 1.40, 95% CI 0.90-2.18, P=0.13), hazard ratios for atrial fibrillation/flutter and serious bleeding were similar across eGFR categories (P-interaction for atrial fibrillation/flutter = 0.92; P-interaction for serious bleeding = 0.76). Conclusions: In REDUCE-IT, icosapent ethyl reduced fatal and nonfatal ischemic events across the broad range of baseline eGFR categories. Clinical Trial Registration: URL: https://clinicaltrials.gov Unique Identifier: NCT01492361