A Meta-Analysis of Cardiovascular Outcomes in Patients With Hypercholesterolemia Treated With Bempedoic Acid

Clinical Benefit of Bempedoic Acid in Randomized Clinical Trials

Bempedoic acid is a selective inhibitor of the adenosine triphosphate citrate lyase that reduces low-density lipoprotein cholesterol (LDLc) levels by 17% to 28%. Although the Evaluation of Major Cardiovascular Events in Patients With, or at High Risk for, Cardiovascular Disease Who Are Statin Intolerant Treated With Bempedoic Acid (CLEAR-OUTCOMES) trials demonstrated the efficacy on cardiovascular outcomes there is a controversy related to the possible net clinical benefit. Thereafter, we performed an intention-to-treat meta-analysis in line with recommendations from the Cochrane Collaboration and the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. The primary outcome of the metanalysis was the incidence of major adverse cardiovascular events, defined by each study protocol. Secondary outcomes for the analyses were myocardial infarction, stroke, myocardial revascularization, cardiovascular death, and all-cause death. Results of 4 clinical trials evaluated contained a total of 17,324 patients; 9,236 received bempedoic acid for a median of 46.6 months. The mean baseline LDLc was 129.4 (22.8) mg/100 ml and treatment was associated with a mean LDLc reduction of 26.0 (12.6) mg/100 ml. Treatment with bempedoic acid significantly reduced the incidence of major adverse cardiovascular events (hazard ratio [HR] 0.88, 95% confidence interval [CI] 0.81 to 0.96), myocardial infarction (HR 0.76, 95% CI 0.66 to 0.89) and myocardial revascularization (HR 0.82, 95% CI 0.73 to 0.92); the crude incidence of stroke, cardiovascular or all-cause mortality were lower in patients in the bempedoic acid groups although no significant risk reduction was observed. No heterogeneity was observed in any of the end points. In conclusion, the metanalysis of the 4 clinical trials currently available with bempedoic acid provides reliable evidence of its clinical benefit with no signs of heterogeneity or harm.

Bempedoic Acid: A New Tool in the Battle Against Hyperlipidemia

PURPOSE

This article discusses the pharmacology of bempedoic acid, the trials that led to United States Food and Drug Administration (FDA) approval of its use, and the overall safety and efficacy of this therapy in heterozygous familial hypercholesterolemia, established atherosclerotic cardiovascular disease (ASCVD), and hyperlipidemia.

METHODS

A database search of PubMed and ClinicalTrials.gov was conducted for articles published between January 2012 to September 2020 and containing the key words bempedoic acid, ezetimibe, Nexletol and Nexlizet. Trials from the CLEAR series were selected, as they played a pivotal role in the establishment of FDA approval, along with additional trials published after FDA approval, which provided novel evidence on the use of bempedoic acid in the treatment of hypercholesterolemia. Publications that were not randomized, controlled trials were not included in this review. Only randomized controlled trials in which ezetimibe was used in conjunction with bempedoic acid were included in this review as they were relevant to the new FDA approval of bempedoic acid.

FINDINGS

The findings of the present review show that bempedoic acid is both an effective and well-tolerated option for the treatment of hypercholesterolemia when used without ezetimibe in addition to standard therapy. It also appears that the combination with ezetimibe increases the cholesterol-lowering effect more than either agent alone when added to standard therapy.

IMPLICATIONS

Hypercholesteremia continues to be a major contributing factor leading to ASCVD. Bempedoic acid is an additional treatment option, along with both statins and diet and exercise, for reducing cholesterol levels and ASCVD events. With the new FDA approval, bempedoic acid may offer an effective therapy for reducing low-density lipoprotein cholesterol in patients at high risk for cardiovascular events due to established ASCVD or heterozygous familial hypercholesterolemia.

Bempedoic Acid and Ezetimibe for the Treatment of Hypercholesterolemia: A Systematic Review and Meta-Analysis of Randomized Phase II/III trials

BACKGROUND AND OBJECTIVE: A limited number of trials have evaluated the efficacy of a fixed-dose combination of bempedoic acid and ezetimibe for the treatment of hypercholesterolemia. The aim of this meta-analysis of existing studies was to evaluate the efficacy and safety of fixed-dose bempedoic acid and ezetimibe combination therapy for the treatment of hypercholesterolemia.

METHODS

A systematic literature search was conducted to identify randomized controlled trials (RCTs) comparing bempedoic acid and ezetimibe, versus placebo or ezetimibe alone, to 30 August 2020. A meta-analysis was conducted to investigate the efficacy of bempedoic acid and ezetimibe on lipid parameters and highly sensitive C-reactive protein (hsCRP) levels in patients with hypercholesterolemia or established atherosclerotic cardiovascular disease (ASCVD). Mean differences (MDs) or relative risk (RR) with their corresponding 95% confidence intervals (CIs), using random-effects models, were used to provide pooled estimates.

RESULTS

A total of three phase II and III RCTs, comprising 388 patients, of whom 49.2% were treated with bempedoic acid and ezetimibe, and 197 controls, were identified. The duration of treatment was 12 weeks. Bempedoic acid and ezetimibe significantly reduced low-density lipoprotein cholesterol (MD - 29.14%, 95% CI - 39.52 to - 18.76; p < .001), total cholesterol (MD - 15.78%, 95% CI - 20.84 to - 10.72; p = 0.01), non-high-density lipoprotein cholesterol (MD - 18.36%, 95% CI - 24.60 to - 12.12; p = 0.01), and hsCRP levels (MD - 30.48%, 95% CI - 44.69 to - 16.28; p = 0.04). No significant effects on triglycerides (MD - 8.35%, 95% CI - 16.08 to - 0.63; p = 0.72) and improvement in high-density lipoprotein cholesterol (MD 1.63%, 95% CI - 4.03 to 7.28; p = 0.92) were observed with the fixed-dose combination therapy. Regarding safety, bempedoic acid and ezetimibe combination was associated with a non-significant increased risk of drug-related adverse events (RR 1.61, 95% CI 0.86-2.35) and overall adverse events (RR 1.16. 95% CI 0.97-1.35); however, the incidence of discontinuation of therapy (RR 0.75, 95% CI 0.35-1.49) was lower.

CONCLUSION

This review found bempedoic acid and ezetimibe significantly lowered lipid parameters, attenuated hsCRP levels, and had an acceptable safety profile for the treatment of hypercholesterolemia and ASCVD.