Pharmacotherapeutic group: Lipid modifying agents, Combinations of various lipid modifying agents, ATC code: C10BA10.
Mechanism of action
Nustendi contains bempedoic acid and ezetimibe, two LDL-C lowering compounds with complementary mechanisms of action. It reduces elevated LDL-C through dual inhibition of cholesterol synthesis in the liver and cholesterol absorption in the intestine.
Bempedoic acid
Bempedoic acid is an adenosine triphosphate-citrate lyase (ACL) inhibitor that lowers LDL-C by inhibition of cholesterol synthesis in the liver. ACL is an enzyme upstream of 3-hydroxy-3-methyl-glutaryl-coenzyme A (HMG-CoA) reductase in the cholesterol biosynthesis pathway. Bempedoic acid requires coenzyme A (CoA) activation by very long-chain acyl-CoA synthetase 1 (ACSVL1) to ETC‑1002-CoA. ACSVL1 is expressed primarily in the liver and not in skeletal muscle. Inhibition of ACL by ETC-1002-CoA results in decreased cholesterol synthesis in the liver and lowers LDL-C in blood via upregulation of low-density lipoprotein receptors. Additionally, inhibition of ACL by ETC‑1002-CoA results in concomitant suppression of hepatic fatty acid biosynthesis.
Ezetimibe
Ezetimibe reduces blood cholesterol by inhibiting the absorption of cholesterol by the small intestine. The molecular target of ezetimibe has been shown to be the sterol transporter, Niemann-Pick C1-Like 1 (NPC1L1), which is involved in the intestinal uptake of cholesterol and phytosterols. Ezetimibe localizes at the brush border of the small intestine and inhibits the absorption of cholesterol, leading to a decrease in the delivery of intestinal cholesterol to the liver.
Pharmacodynamic effects
Administration of bempedoic acid and ezetimibe alone and in combination with other lipid modifying medicinal products decreases LDL-C, non-high density lipoprotein cholesterol (non-HDL-C), apolipoprotein B (apo B), and total cholesterol (TC) in patients with hypercholesterolaemia or mixed dyslipidaemia. Bempedoic acid decreases C-reactive protein (CRP) in patients with hyperlipidaemia.
Because patients with diabetes are at elevated risk for atherosclerotic cardiovascular disease, the clinical trials of bempedoic acid included patients with diabetes mellitus. Among the subset of patients with diabetes, lower levels of haemoglobin A1c (HbA1c) were observed as compared to placebo (on average 0.2%). In patients without diabetes, no difference in HbA1c was observed between bempedoic acid and placebo and there were no differences in the rates of hypoglycaemia.
Cardiac electrophysiology
A QT trial has been conducted for bempedoic acid. At a dose of 240 mg (1.3 times the approved recommended dose), bempedoic acid does not prolong the QT interval to any clinically relevant extent.
The effect of ezetimibe or the combination regimen bempedoic acid/ezetimibe on QT interval has not been evaluated.
Clinical efficacy and safety
Ezetimibe 10 mg has been shown to reduce the frequency of cardiovascular events.
Clinical efficacy and safety in primary hypercholesterolaemia and mixed dyslipidaemia
The efficacy of Nustendi was assessed in a sensitivity analysis of 301 patients who received treatment in CLEAR Combo (Study 1002-053). This analysis excluded all data from 3 sites (81 patients) due to systematic patient non-compliance with all the four treatments. The study was a 4-arm, multi-centre, randomised, double-blind, parallel-group, 12‑week trial in patients with high cardiovascular risk and hyperlipidaemia. Patients randomised 2:2:2:1, received either Nustendi orally at a dose of 180 mg/10 mg per day (n=86), bempedoic acid 180 mg per day (n=88), ezetimibe 10 mg per day (n=86), or placebo once daily (n=41) as add-on to a maximum tolerated statin therapy. Maximum tolerated statin therapy could include statin regimens other than daily dosing or no statin. Patients were stratified by cardiovascular risk and baseline statin intensity. Patients on simvastatin 40 mg per day or higher were excluded from the trial.
Demographics and baseline disease characteristics were balanced between the treatment arms. Overall, the mean age at baseline was 64 years (range: 30 to 87 years), 50% were ≥ 65 years old, 50% were women, 81% were White, 17% were Black, 1% were Asian, and 1% were other. At the time of randomisation, 61% of patients on bempedoic acid/ezetimibe, 69% of patients on bempedoic acid, 63% of patients on ezetimibe and 66% of patients on placebo were receiving statin therapy; 36% of patients on bempedoic acid/ezetimibe, 35% of patients on bempedoic acid, 29% of patients on ezetimibe and 41% of patients on placebo were receiving high intensity statin therapy. The mean baseline LDL-C was 3.9 mmol/L (149.7 mg/dL). Most patients (94%) completed the study.
Nustendi significantly reduced LDL-C from baseline to week 12 compared with placebo (-38.0%; 95% CI: -46.5%, -29.6%; p < 0.001). The maximum LDL-C lowering effects were observed as early as week 4 and efficacy was maintained throughout the trial. Nustendi also significantly reduced non‑HDL-C, apo B, and TC (see table 2).
Table 2: Treatment effects of Nustendi on lipid parameters in patients with high cardiovascular risk and hyperlipidaemia on background statin regimens (mean % change from baseline to week 12)
| | Nustendi 180 mg/10 mg n=86 | Bempedoic acid 180 mg n=88 | Ezetimibe 10 mg n=86 | Placebo n=41 |
| LDL-C, n | 86 | 88 | 86 | 41 |
| LS Mean (SE) | -36.2 (2.6) | -17.2 (2.5) | -23.2 (2.2) | 1.8 (3.5) |
| non-HDL-C, n | 86 | 88 | 86 | 41 |
| LS Mean (SE) | -31.9 (2.2) | -14.1 (2.2) | -19.9 (2.1) | 1.8 (3.3) |
| apo B, n | 82 | 85 | 84 | 38 |
| LS Mean (SE) | -24.6 (2.4) | -11.8 (2.2) | -15.3 (2.0) | 5.5 (3.0) |
| TC, n | 86 | 88 | 86 | 41 |
| LS Mean (SE) | -26.4 (1.9) | -12.1 (1.8) | -16.0 (1.6) | 0.7 (2.5) |
apo B=apolipoprotein B; CI=confidence interval; HDL-C=high-density lipoprotein cholesterol, LDL C=low-density lipoprotein cholesterol; LS=least squares; TC=total cholesterol.
Background statin: atorvastatin, lovastatin, pitavastatin, pravastatin, rosuvastatin, simvastatin.
Administration of bempedoic acid on background ezetimibe therapy
CLEAR Tranquility (Study 1002-048) was a multi-centre, randomised, double-blind, placebo-controlled 12-week phase 3 primary hyperlipidaemia study evaluating the efficacy of bempedoic acid versus placebo in lowering LDL-C when added to ezetimibe in patients with elevated LDL-C who had a history of statin intolerance and were unable to tolerate more than the lowest approved starting dose of a statin. The trial included 269 patients randomised 2:1 to receive either bempedoic acid (n=181) or placebo (n=88) as add-on to ezetimibe 10 mg daily for 12 weeks.
Overall, the mean age at baseline was 64 years (range: 30 to 86 years), 55% were ≥ 65 years old, 61% were women, 89% were White, 8% were Black, 2% were Asian, and 1% were other. The mean baseline LDL-C was 3.3 mmol/L (127.6 mg/dL). At the time of randomisation, 33% of patients on bempedoic acid versus 28% on placebo were receiving statin therapy at less than or equal to lowest approved doses. Administration of bempedoic acid to patients on background ezetimibe therapy significantly reduced LDL-C from baseline to week 12 compared with placebo and ezetimibe (p < 0.001). Administration of bempedoic acid with background ezetimibe therapy also significantly reduced non-HDL-C, apo B, and TC (see table 3).
Table 3: Treatment effects of bempedoic acid compared with placebo in statin intolerant patients on background ezetimibe therapy (mean percent change from baseline to week 12)
| | CLEAR Tranquility (Study 1002-048) (N=269) |
| Bempedoic acid 180 mg + Background Ezetimibe 10 mg n=181 | Placebo + Background Ezetimibe 10 mg n=88 |
| LDL-Ca, n | 175 | 82 |
| LS Mean | -23.5 | 5.0 |
| non-HDL-Ca, n | 175 | 82 |
| LS Mean | -18.4 | 5.2 |
| apo Ba, n | 180 | 86 |
| LS Mean | -14.6 | 4.7 |
| TCa, n | 176 | 82 |
| LS Mean | -15.1 | 2.9 |
apo B=apolipoprotein B; CI=confidence interval; HDL-C=high-density lipoprotein cholesterol; LDL C=low-density lipoprotein cholesterol; LS=least squares; TC=total cholesterol.
Background statin: atorvastatin, simvastatin, rosuvastatin, pravastatin, lovastatin
a. Percent change from baseline was analysed using analysis of covariance (ANCOVA), with treatment and randomisation strata as factors and baseline lipid parameter as a covariate.
Clinical efficacy and safety in prevention of cardiovascular events
CLEAR Outcomes (Study 1002-043) was a multi-centre randomised, double-blind, placebo-controlled, event-driven trial in 13 970 adult patients with established atherosclerotic cardiovascular disease (CVD) (70%), or at high risk for atherosclerotic CVD (30%). Patients with established CVD had documented history of coronary artery disease, symptomatic peripheral arterial disease, and/or cerebrovascular atherosclerotic disease. Patients without established CVD were considered at high risk for CVD based on meeting at least one of the following criteria: (1) diabetes mellitus (type 1 or type 2) in women over 65 years of age, or men over 60 years of age, or (2) a Reynolds Risk score >30% or a SCORE Risk score >7.5% over 10 years, or 3) a coronary artery calcium score >400 Agatston units at any time in the past. Patients were randomised 1:1 to receive either bempedoic acid 180 mg per day (n = 6 992) or placebo (n = 6 978) alone or as an add on to other background lipid lowering therapies that could include very low doses of statins. Overall, more than 95% of patients were followed until the end of the trial or death, and less than 1% were lost to follow up. The median follow-up duration was 3.4 years.
At baseline, the mean age was 65.5 years, 48% were women, 91% were White. Selected additional baseline characteristics included hypertension (85%), diabetes mellitus (46%), pre-diabetes mellitus (42%), current tobacco user (22%), eGFR < 60 mL/min per 1.73 m2 (21%), and a mean body mass index 29.9 kg/m2. The mean baseline LDL-C was 3.6 mmol/L (139 mg/dL). At baseline, 41% of patients were taking at least one lipid modifying therapy including ezetimibe (12%), and very low dose of statins (23%).
Bempedoic acid significantly reduced the risk for the primary composite endpoint of major adverse cardiovascular events (MACE-4) consisting of cardiovascular death, non-fatal myocardial infarction, non-fatal stroke, or coronary revascularization by 13% compared to placebo (Hazard Ratio: 0.87; 95% CI: 0.79, 0.96; p = 0.0037); and the risk of the key secondary MACE-3 composite endpoint (cardiovascular death, non-fatal myocardial infarction, or non-fatal stroke) was significantly reduced by 15% compared to placebo (Hazard Ratio: 0.85; 95% CI: 0.76, 0.96; p = 0.0058). The primary composite endpoint result was generally consistent across prespecified subgroups (including baseline age, race, ethnicity, sex, LDL-C category, statin use, ezetimibe use, and diabetes). The point estimate for MACE-4 Hazard Ratio was 0.94 (95% CI: 0.74, 1.20) in the subgroup of patients using ezetimibe at baseline. For the limited subgroup of patients with ezetimibe use at baseline and at high cardiovascular risk (n=335), LDL-C reduction was -26.7% (95% CI; -30.9%, -22.4%), but cardiovascular risk reduction could not be estimated.
Impact of bempedoic acid on the individual components of the primary endpoint included a 27% reduction in the risk of non-fatal myocardial infarction and a 19% reduction in the risk of coronary revascularization compared to placebo. There was no statistically significant difference in the reduction of non-fatal stroke and risk of cardiovascular death compared to placebo. The results of the primary and key secondary efficacy endpoints are shown in Table 4. The Kaplan-Meier curve estimates of the cumulative incidence of the MACE-4 primary and the MACE-3 secondary endpoint are shown in Figures 1 and 2 below. The cumulative incidence of the MACE-4 primary endpoint is separated by month 6.
Further, the difference between bempedoic acid and placebo in mean percent change in LDL-C from baseline to month 6 was -20% (95% CI: -21%, -19%).
Table 4: Effect of Bempedoic acid on Major Cardiovascular Events
| Endpoint | Bempedoic acid N=6 992 | Placebo N=6 978 | Bempedoic acid vs. Placebo |
| n (%) | n (%) | Hazard Ratioa (95% CI) p-valueb |
| Primary Composite Endpoint |
| Cardiovascular death, non-fatal myocardial infarction, non-fatal stroke, coronary revascularization (MACE-4) | 819 (11.7) | 927 (13.3) | 0.87 (0.79, 0.96) 0.0037 |
| Components of Primary Endpoint |
| Non-fatal myocardial infarction | 236 (3.4) | 317 (4.5) | 0.73 (0.62, 0.87) |
| Coronary revascularization | 435 (6.2) | 529 (7.6) | 0.81 (0.72, 0.92) |
| Non-fatal stroke | 119 (1.7) | 144 (2.1) | 0.82 (0.64, 1.05) |
| Cardiovascular death | 269 (3.8) | 257 (3.7) | 1.04 (0.88, 1.24) |
| Key Secondary Endpoints |
| Cardiovascular death, non-fatal myocardial infarction, non-fatal stroke (MACE-3) | 575 (8.2) | 663 (9.5) | 0.85 (0.76, 0.96) 0.0058 |
| Fatal and non-fatal myocardial infarction | 261 (3.7) | 334 (4.8) | 0.77 (0.66, 0.91) 0.0016 |
| Coronary revascularization | 435 (6.2) | 529 (7.6) | 0.81 (0.72, 0.92) 0.0013 |
| Fatal and non-fatal stroke | 135 (1.9) | 158 (2.3) | 0.85 (0.67, 1.07) NS |
CI = confidence interval; MACE = major adverse cardiovascular event; NS=not significant.
a. Hazard ratio and corresponding 95% CI were based on a Cox proportional hazard model fitting treatment as explanatory variable.
b. p-value was based on log rank test.
Note: this table also presents the time to first occurrence for each of the components of MACE; patients may be included in more than 1 category
Figure 1: Kaplan-Meier Curve for Time to First Occurrence of MACE-4
MACE = major adverse cardiovascular event
Note: MACE-4 defined as the composite endpoint of CV death, non-fatal MI, non-fatal stroke, or coronary revascularization.
Figure 2: Kaplan-Meier Curve for Time to First Occurrence of MACE-3
MACE = major adverse cardiovascular event
Note: MACE-3 defined as the composite endpoint of CV death, non-fatal MI, or non-fatal stroke.
Paediatric population
The European Medicines Agency has waived the obligation to submit the results of studies with Nustendi in all subsets of the paediatric population in the treatment of elevated cholesterol (see section 4.2 for information on paediatric use).