Comparison of fluvastatin + fenofibrate combination therapyand fluvastatin monotherapy in the treatment of combined hyperlipidemia,type 2 diabetes mellitus, and coronary heart disease: a 12-month, randomized, double-blind, controlled trial

Abstract

Background: Diabetes risk is often complicated by a mixed hyperlipoproteinemia not sufficiently controlled by a single antihyperlipidemic drug; however, there are some concerns about the safety of combined statin and fibrate treatments. Objective The aim of this study was to compare the efficacy and safety profile of fluvastatin + fenofibrate combination therapy and those of fluvastatin monotherapy in the treatment of combined hyperlipidemia, type 2 diabetes mellitus (DM), and coronary heart disease (CHD) (ie, high risk for cardiovascular disease [CVD]). Methods: This 12-month, randomized, double-blind, controlled trial was conducted at the University of Pavia, Pavia, Italy. Patients aged 18 to 80 years with combined hyperlipidemia, type 2 DM, and CHD were randomly assigned to receive combination therapy with extended-release fluvastatin 80 mg + micronized fenofibrate 200 mg or monotherapy with extended-release fluvastatin 80 mg. All treatments were given in tablet form, once daily with the evening meal, for 12 months. Lipid variables (low-density lipoprotein cholesterol [LDL-C], high-density lipoprotein cholesterol [HDL-C], total cholesterol [TC], and triglycerides [TG]) at 6 and 12 months were the primary efficacy variables, and glycemic status (glycosylated hemoglobin [HbA 1c], fasting plasma glucose, and postprandial plasma glucose levels) at 6 and 12 months was the secondary efficacy variable. Tolerability was assessed using physical examination, including vital-sign assessment, body-weight measurement, electrocardiography, adverse events, and laboratory tests. A pharmacoeconomic analysis of both treatment regimens was also carried out using the incremental cost-effectiveness ratio (ICER). Results: A total of 48 patients (24 men, 24 women; mean [SD] age, 60 [5] years) were enrolled. After 6 months, all primary efficacy variables, except for TG level, showed significant improvements from baseline only in the combination-therapy group (changes: LDL-C, −25%; HDL-C, +12%; and TC, −19%; all, P < 0.05 vs baseline). After 12 months, lipid variables showed significant improvements over baseline in both groups (all, P < 0.05), except for TG in the monotherapy group. Significant changes in LDL-C, HDL-C, and TG were found in the combination-therapy group (−35%, +34%, −32%, respectively) versus the monotherapy group (−25%, +14%, −17%, respectively; all, P < 0.05 between groups). The change from baseline in HbA 1c level was significant with combination therapy (−12% vs −7%; P < 0.05). Both treatments were well tolerated, with no significant differences in the incidences of adverse events between the 2 groups. The ICER showed that each 1% decrease in LDL-C level achieved with the fenofibrate + fluvastatin combination added a cost of 14.97/y (US $12.25/y), and each 1% increase in HDL-C level added a cost of 7.48/y (US $6.12/y), over the cost of monotherapy. Conclusions: In this selected sample of patients with combined hyperlipidemia, type 2 DM, and CHD, the combination of extended-release fluvastatin + micronized fenofibrate was associated with a more improved lipid profile than fluvastatin monotherapy, and was a well-tolerated and cost-effective therapeutic choice to treat these patients at high risk for CVD.