Pharmacotherapeutic group: Lipid modifying agents, other lipid modifying agents, ATC code: C10AX15
Mechanism of action
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.
Pharmacodynamic effects
Administration of bempedoic acid 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), total cholesterol (TC), and C-reactive protein (CRP) in patients with hypercholesterolaemia or mixed dyslipidaemia.
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
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.
Clinical efficacy and safety
Clinical efficacy and safety in primary hypercholesterolaemia and mixed dyslipidaemia
The efficacy of Nilemdo was investigated in four multi-centre, randomised, double‑blind, placebo‑controlled phase 3 primary hyperlipidaemia studies involving 3 623 adult patients with hypercholesterolaemia or mixed dyslipidaemia, with 2 425 patients randomised to bempedoic acid. All patients received bempedoic acid 180 mg or placebo orally once daily. In two trials, patients were taking background lipid-modifying therapies consisting of a maximum tolerated dose of statin, with or without other lipid-modifying therapies. Two trials were conducted in patients with documented statin intolerance. The primary efficacy endpoint in all Phase 3 trials was the mean percent reduction from baseline in LDL-C at week 12 as compared with placebo.
Combination therapy with statins
CLEAR Wisdom (Study 1002-047) was a multi-centre, randomised, double‑blind, placebo-controlled, 52‑week phase 3 primary hyperlipidaemia study in patients with hypercholesterolaemia or mixed dyslipidaemia. Efficacy of Nilemdo was evaluated at week 12. The trial included 779 patients randomised 2:1 to receive either bempedoic acid (n=522) or placebo (n=257) as add-on to a maximum tolerated lipid lowering therapy. Maximum tolerated lipid lowering therapy was defined as a maximum tolerated statin dose (including statin regimens other than daily dosing and no to very low doses) alone or in combination with other lipid-lowering therapies. Patients on simvastatin 40 mg/day or higher were excluded from the trial.
Overall, the mean age at baseline was 64 years (range: 28 to 91 years), 51% were ≥ 65 years old, 36% were women, 94% were White, 5% were Black, and 1% were Asian. The mean baseline LDL-C was 3.1 mmol/L (120.4 mg/dL). At the time of randomisation, 91% of patients were receiving statin therapy and 53% were receiving high-intensity statin therapy. Bempedoic acid significantly reduced LDL-C from baseline to week 12 compared with placebo (p < 0.001). Bempedoic acid also significantly reduced non-HDL-C, apo B, and TC.
CLEAR Harmony (Study 1002-040) was a multi-centre, randomised, double‑blind, placebo‑controlled 52‑week phase 3 primary hyperlipidaemia study evaluating safety and efficacy of bempedoic acid in patients with hypercholesterolaemia or mixed dyslipidaemia. Efficacy of Nilemdo was evaluated at week 12. The trial included 2 230 patients randomised 2:1 to receive either bempedoic acid (n=1 488) or placebo (n=742) as add-on to a maximum tolerated lipid lowering therapy. Maximum tolerated lipid lowering therapy was defined as a maximum tolerated statin dose (including statin regimens other than daily dosing and very low doses) alone or in combination with other lipid lowering therapies. Patients on simvastatin 40 mg per day or higher and patients on PCSK9 inhibitors were excluded from the trial.
Overall, the mean age at baseline was 66 years (range: 24 to 88 years), 61% were ≥ 65 years old, 27% were women, 96% were White, 3% were Black, and 1% were Asian. The mean baseline LDL-C was 2.7 mmol/L (103.2 mg/dL). At the time of randomisation, all patients were receiving statin therapy and 50% were receiving high-intensity statin therapy. Bempedoic acid significantly reduced LDL-C from baseline to week 12 compared with placebo (p < 0.001). A significantly higher proportion of patients achieved an LDL-C of < 1.81 mmol/L (< 70 mg/dL) in the bempedoic acid group as compared with placebo at week 12 (32% versus 9%, P < 0.001), bempedoic acid also significantly reduced non‑HDL‑C, apo B, and TC (see table 2).
Table 2. Treatment effects of Nilemdo compared with placebo in patients with primary hypercholesterolaemia or mixed dyslipidaemia - mean percent change from baseline to week 12
| | CLEAR Wisdom (Study 1002-047) (N=779) | CLEAR Harmony (Study 1002-040) (N=2 230) |
| Nilemdo n=522 | Placebo n=257 | Nilemdo n=1 488 | Placebo n=742 |
| LDL-Ca, n | 498 | 253 | 1 488 | 742 |
| LS Mean | -15.1 | 2.4 | -16.5 | 1.6 |
| non-HDL-Ca, n | 498 | 253 | 1 488 | 742 |
| LS Mean | -10.8 | 2.3 | -11.9 | 1.5 |
| apo Ba, n | 479 | 245 | 1 485 | 736 |
| LS Mean | -9.3 | 3.7 | -8.6 | 3.3 |
| TCa, n | 499 | 253 | 1 488 | 742 |
| LS Mean | -9.9 | 1.3 | -10.3 | 0.8 |
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 (1002-047): atorvastatin, simvastatin, rosuvastatin, pravastatin, fluvastatin, pitavastatin, and lovastatin.
Background statin (1002-040): atorvastatin, simvastatin, pravastatin.
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.
Statin intolerant patients
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 Nilemdo 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. Bempedoic acid significantly reduced LDL-C from baseline to week 12 compared with placebo (p < 0.001). Bempedoic acid also significantly reduced non-HDL-C, apo B, and TC (see table 3).
CLEAR Serenity (Study 1002-046) was a multi-centre, randomised, double-blind, placebo-controlled 24-week phase 3 primary hyperlipidaemia study evaluating the efficacy of Nilemdo versus placebo in patients with elevated LDL-C who were statin‑intolerant or unable to tolerate two or more statins, one at the lowest dose. Patients able to tolerate a dose that was less than the approved starting dose of a statin were allowed to stay on that dose during the study. Efficacy of bempedoic acid was evaluated at week 12. The trial included 345 patients randomised 2:1 to receive either bempedoic acid (n=234) or placebo (n=111) for 24 weeks. At the time of randomisation, 8% of patients on bempedoic acid versus 10% on placebo were receiving statin therapy at less than the lowest approved doses and 36% of patients on bempedoic acid versus 30% of patients on placebo were on other nonstatin lipid-modifying therapies.
Overall, the mean age at baseline was 65 years (range: 26 to 88 years), 58% were ≥ 65 years old, 56% were women, 89% were White, 8% were Black, 2% were Asian, and 1% were other. The mean baseline LDL-C was 4.1 mmol/L (157.6 mg/dL).
Bempedoic acid significantly reduced LDL-C from baseline to week 12 compared with placebo (p < 0.001). Bempedoic acid also significantly reduced non-HDL-C, apo B, and TC (see table 3).
Treatment in the absence of lipid-modifying therapies
In CLEAR Serenity (Study 1002-046), 133 patients in the bempedoic acid group and 67 patients in the placebo group were on no background lipid-modifying therapies. Bempedoic acid significantly reduced LDL-C from baseline to week 12 compared with placebo in this subgroup. The difference between bempedoic acid and placebo in mean percent change in LDL-C from baseline to week 12 was -22.1% (CI: ‑26.8%, ‑17.4%; p < 0.001).
Table 3. Treatment effects of Nilemdo compared with placebo in statin intolerant patients - mean percent change from baseline to week 12
| | CLEAR Tranquility (Study 1002-048) (N=269) | CLEAR Serenity (Study 1002-046) (N=345) |
| Nilemdo n=181 | Placebo n=88 | Nilemdo n=234 | Placebo n=111 |
| LDL-Ca, n | 175 | 82 | 224 | 107 |
| LS Mean | -23.5 | 5.0 | -22.6 | -1.2 |
| non-HDL-Ca | 175 | 82 | 224 | 107 |
| LS Mean | -18.4 | 5.2 | -18.1 | -0.1 |
| apo Ba, n | 174 | 81 | 218 | 104 |
| LS Mean | -14.6 | 4.7 | -14.7 | 0.3 |
| TCa, n | 176 | 82 | 224 | 107 |
| LS Mean | -15.1 | 2.9 | -15.4 | -0.6 |
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 (1002-048): atorvastatin, simvastatin, rosuvastatin, pravastatin, lovastatin
Background statin (1002-046): atorvastatin, simvastatin, pitavastatin, 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.
In all four trials, the maximum LDL-C lowering effects were observed as early as week 4 and efficacy was maintained throughout the trials. These results were consistent across all subgroups studied in any of the trials, including age, gender, race, ethnicity, region, history of diabetes, baseline LDL-C, body mass index (BMI), HeFH status, and background therapies.
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 Nilemdo 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%).
Nilemdo 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). Impact of Nilemdo 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 Nilemdo and placebo in mean percent change in LDL-C from baseline to month 6 was -20% (95% CI: -21%, -19%).
Table 4: Effect of Nilemdo on Major Cardiovascular Events
| Endpoint | Nilemdo N=6 992 | Placebo N=6 978 | Nilemdo 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 deferred the obligation to submit the results of studies with bempedoic acid in paediatric population from 4 to less than 18 years of age in the treatment of elevated cholesterol. See section 4.2 for information on paediatric use.