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Dyslipidaemia: what's around the corner?

Anthony S Wierzbicki, Dilinika Perera and Mfon Ewang-Emukowhate
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DOI: https://doi.org/10.7861/clinmedicine.14-6-s41
Clin Med December 2014
Anthony S Wierzbicki
AGuy's and St Thomas’ Hospitals, London, UK
Roles: consultant
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  • For correspondence: anthony.wierzbicki@kcl.ac.uk
Dilinika Perera
BGuy's and St Thomas’ Hospitals, London, UK
Roles: specialist registrar
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Mfon Ewang-Emukowhate
CGuy's and St Thomas’ Hospitals, London, UK
Roles: specialist registrar
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ABSTRACT

Hyperlipidaemia is a major risk factor for the development of atherosclerosis and cardiovascular disease. Statins are the mainstay of therapy and new guidelines focus on the use of these agents without specific targets for low-density lipoprotein (LDL)-cholesterol or non high-density lipoprotein (HDL)-cholesterol. However, patients remain at risk of cardiovascular disease despite statin therapy so new drugs are required. This article reviews therapies in development to further lower LDL-cholesterol (Proprotein convertase subtilisin/kexin-9 (PCSK-9) inhibitors), raise HDL-holesterol (cholesterol ester transfer protein inhibitors (CETPIs)) and reduce triglycerides (novel peroxisome proliferator-activated receptor (PPAR)-agonists and omega-3 fatty acid preparations). Specialised therapies are in development for treatment of orphan disoders such as homozygous familial hypercholesterolaemia (lomitapide) or familial chylomicroaemia (alipogene tiparvovec). These novel lipid-lowering agents are likely to find uses in treating patients at the highest cardiovascular risk.

KEYWORDS
  • Cardiovascular disease
  • hyperlipidaemia
  • cholesterol
  • PCSK9
  • cholesterol ester transfer protein inhibitor

Introduction

Atherosclerosis and its consequent cardiovascular disease (CVD) is one of the most common causes of morbidity and mortality worldwide. Its incidence is increasing globally as nutrition improves, western lifestyles are adopted and populations age. Hyperlipidaemia, or more accurately dyslipidaemia, is a major risk factor for CVD and may account for up to 55% of age and gender-independent risk.1 The dyslipidaemia component that accounts for the epidemiological risk is the ratio of total cholesterol to high-density lipoprotein-cholesterol (HDL-C), or alternatively the ratio of apolipoprotein B:A-1 concentrations, which identifies the fraction of lipid particles (whether triglyceride-rich or not) depositing cholesterol in the vascular wall compared to those removing it. At its simplest, this process can be expressed as non-HDL-C (difference of total and HDL-C) vs HDL-C.

Dyslipidaemia had been treated with varying degrees of enthusiasm for 50 years but has become one of the major treatment priorities since the publication of the Scandinavian Simvastatin Survival Study in 1994,2 which showed that statins not only decreased CVD but also reduced mortality in high-risk patients with established coronary heart disease (CHD). Later statin studies have extended the indications for this treatment to include stroke, CVD in diabetes and the treatment of asymptomatic but higher risk individuals in primary prevention.3 Analyses of surrogate outcome measures such as intravascular ultrasound measured atheroma volume and epidemiological studies suggest that, though CVD risk is exponential when plotted against low-density lipoprotein-cholesterol (LDL-C) or non-HDL-C concentrations, significant risk only begins to accrue above an LDL-C of 2 mmol/l or non-HDL-C of 2.8 mmol/l. The benefits of statins can be summarised as a 20% reduction in relative risk of CVD events per 1 mmol/l reduction in LDL-C, if a linear model is assumed.3

The guidelines debate

Recent guidelines from the USA4 and UK (draft NICE guidelines)5 have incorporated the evidence from statin trials into clinical practice and, noting the far lesser benefits of other treatments (fibrates, niacin and omega-3 fatty acids), have suggested maximising statin therapy in patients with CVD or its risk equivalents (eg diabetes and chronic kidney disease stage 3). These guidelines have abandoned targets for LDL-C based on fundamentals of trial designs and the lack of evidence for add-on therapies. In contrast, the European societies’ guidelines retain targets for LDL-C of 2.5 mmol/l and preferably <2 mmol/l in patients with CVD.6 In essence this difference relates to two different views of the benefits of lipid-lowering and how they should be assessed. In one view, outcomes evidence trumps all other surrogate measures; holders of this view note that some statin trials (eg in grade 2/3 heart failure or chronic kidney disease (CKD)3-5) have been unsuccessful despite large reductions in LDL-C. The other view is that CKD3-5 and heart failure represent conditions where atherothrombotic events are rare and atherosclerosis is too prevalent and well established to respond to lipid-lowering therapy in short-term trials, and that reductions in LDL-C will generally lead to reductions in CVD however they are achieved. As few trials or interventions have addressed HDL-C or triglycerides, these are generally viewed by guidelines as modifiers of underlying risk or determinants of residual risk after LDL-C has been addressed. Many compounds are in development, given the importance of lipids to CVD risk.7,8

New lipid-lowering drugs for LDL-cholesterol

Statins are generally well tolerated but increased rates of myalgia and myositis are known common problems with these drugs. The frequency of these side-effects is disputed, ranging from minimal in the placebo-controlled trials to reports of rates up to 15% in general use.9 Some of these problems can be addressed by switching statins or intermittent dosing regimes.10 There are also patients who do not seem to respond well to statin therapy or in whom baseline LDL-C levels are so high that in many cases statins cannot reduce them to levels seen in the general population, for example patients with familial hypercholesterolaemia (FH). Therapies beyond statins to lower LDL-C exist. Bile acid sequestrants have a long history; some evidence in monotherapy exists from the lipid research clinics trial but is limited by low efficacy (20% LDL-C reduction), poor tolerability and frequent drug interactions. Ezetimibe is commonly used, reduces LDL-C by 23% and is well tolerated. However, both surrogate and endpoint trials with ezetimibe have had unclear results.11 The results of the IMPROVE-IT monotherapy trial are expected in 2014 but given the small difference expected in an acute coronary syndrome (ACS) population, based on a 0.4 mmol/l difference in LDL-C, this may not answer the questions about this agent. There is thus a need for high efficacy, safe non-statin methods of reducing LDL-C.

Inhibition of pro-protein convertase subtilisin/kexin 9

Research into populations with FH identified dominant activating mutations in pro-protein convertase subtilisin/kexin 9 (PCSK-9) as causing inhibition of LDL receptor function, resulting in high plasma LDL-C levels. By contrast, inactivating mutations reduced LDL-C by 0.6 mmol/l and were associated with decreased rates of CVD in African-American populations.12 A small number of PCSK-9 deficient homozygotes were identified and found to be clinically normal, suggesting that inhibition of this pathway had few potentially deleterious effects. This has led to the development of a number of strategies to pharmacologically inhibit PCSK-9.8,12 The furthest in development are humanised monoclonal antibodies to PCSK-9. These drugs include alirocumab (REGN-727), evolocumab (AMG-145) and bococizumab (RN-316). Numerous trials of these agents have been conducted in populations with hypercholesterolaemia, FH and type 2 diabetes and in patients with documented intolerance to three or more statins. The results are consistent in showing a 50–65% reduction in LDL-C over and above any existing therapy or compared to placebo with minimal side-effects. One study in homozygous FH, a condition where statins have limited, if any, efficacy shows that inhibition of PCSK-9 is partially effective in one-third of patients, giving a 20–30% reduction in LDL-C.13 Data are now available on 1,000 patient-years of trial experience, in some cases confirming that these drugs show consistent efficacy and good safety profiles.14 However, all of these agents need to be given as subcutaneous injections either fortnightly or monthly. Antibodies are made to these exogenous proteins, analogous to the case of anti-tumour necrosis factor (TNF) antibody therapies used in rheumatology, but this has not proved a problem to date. At this stage in the development of statins, both myalgia/myositis and gastrointestinal disturbance had been identified as side-effects of statin therapy. Endpoint trials are underway with all three drugs either in populations with ACS (alirocumab; ODYSSEY outcomes) or chronic CHD (evolocumab; FOURIER; bocucizumab, SPIRE-2) and are due to report in 2016–18. One interesting feature of the design of these studies is that optimal control of LDL-C to <2 mmol/l is assumed, so subjects recruited to these studies must have additional risk factors (eg smoking, diabetes or the metabolic syndrome) to drive event rates to significant levels.

The other approach to inhibiting PCSK-9 is to use antisense oligonucleotides (ASOs). One compound, ALN-PCS, has reached phase I human trials and after intravenous infusion reduced LDL-C by 25%.15 Further trials are required to see if similar efficacy to the antibody-based therapies can be achieved and whether the injection site reactions characteristic of ASO therapies occur and are manageable. Attempts have been made to make small molecule inhibitors of PCSK-9 as the protein functions as an autocatalytic dimer, but these have not been successful to date.12

Interventions to raise HDL-cholesterol

Epidemiology and residual event rates within clinical trials of statins consistently show that higher levels of HDL-C are associated with better prognosis.16 However there are few interventions trials for HDL-C. Statins have little effect on HDL-C. One fibrate trial, the VA-HIT trial, showed a 25% reduction in events with gemfibrozil in a low-HDL-C population with a drug that had no effect on LDL-C. However, though outcomes correlated with an elevation in HDL-C, this effect at 6% was modest.17 Niacin raises HDL-C by 25% but also reduces LDL-C by 10%.18 In the Coronary Drug Project, niacin reduced CVD events and was more effective than the comparator fibrate-clofibrate. However, in the recent AIM-HIGH and HPS2/THRIVE studies, niacin did not add to statin (and ezetimibe) therapy, resulting in no CVD benefit, but did lead to an increase in rates of new diabetes, gastrointestinal side-effects and infections.

Individuals with inherited ultra-high HDL-C levels exist and as a result they have very low LDL-C levels. Some have mutations in cholesterol ester transfer protein (CETP). Epidemiological studies of migrants with CETP deficiency suggest a small CVD benefit of their impaired CETP function and raised HDL-C levels.19 Oral compounds that inhibit CETP have been developed.8 The first, torcetrapib, was highly effective in raising HDL-C by 100–150% but increased CVD events in the ILLUMINATE trial. This has been ascribed to its off-target actions in increasing aldosterone, corticosterone and endothelin-1 levels, leading to an average 5 mmHg rise in blood pressure in the treatment arm of the trial.20 The second, the CETP inhibitor dalcetrapib, was designed to modulate and not completely inhibit CETP activity. Excess CETP activity is a feature of the process resulting in the formation of the small dense atherogenic LDL particles seen in type 2 diabetes. CETP is actually involved in modulating/converting particles containing apolipoprotein B or A-1, as well as the exchange shuttle of cholesterol for triglycerides between the two particle series. In the Dal-OUTCOMES study, dalcetrapib showed no benefit on CVD events in an ACS population.21 Two drugs – anacetrapib and evacetrapib – remain in development. Both raise HDL-C by 80–120% and reduce LDL-C by 30–40%. Neither raises blood pressure. Outcome studies are underway with both compounds in populations with chronic CVD (anacetrapib; HPS3/REVEAL) and acute coronary syndromes (evacetrapib; ACCELERATE). Results are expected in 2016–17. Ironically, even if the effects of CETP inhibitors on HDL-C prove irrelevant, these drugs may reduce CVD events simply as a by-product of the action to reduce LDL-C.

Controversy exists about whether the cholesterol content/transport ability of HDL particles is actually the best measure of their function. Many of the multiplicity of apolipoproteins associated with HDL particles have anti-inflammatory actions. Irrespective of the exact function of HDL, infusions of HDL particles in animal models reduce atherosclerosis and in one proof-of-concept trial in man using an apolipoprotein-A1Milano, a hyperfunctional HDL particle showed a large decrease in intravascular ultrasound atheroma volume after only five infusions.22 Unfortunately it has to date proved impossible to synthesise these particles on a large scale.

Interventions on triglycerides

Triglycerides are a controversial risk factor for CVD. In many cases high triglycerides are simply the mirror of low HDL-C levels. Epidemiological studies suggest they may add to CVD risk above HDL-C, but the results are not consistent. Two existing classes of lipid-lowering drugs affect triglyceride levels. Fibrates (peroxisomal proliferator activating receptor-alpha [PPAR-α] agonists) reduce triglycerides and change small dense atherogenic LDL particles to large buoyant easily cleared ones. They can also raise HDL-C through increasing synthesis of apoA-1, and some reduce LDL-C. They have a modest benefit in reducing CVD events in meta-analyses of the trials over the last 50 years and may have additional benefits on microvascular disease in diabetes.23,24 The related PPAR–γ agonists (glitazones and thiazolidinediones) have proved controversial. They reduce glucose levels and some have lipid benefits that resemble the actions of fibrates. Pioglitazone reduced CVD events in the PROACTIV trial but rosiglitazone may have increased CVD events in a meta-analysis of trials. Combined PPAR-α/γ agonists potentially offered beneficial effects on lipids and glycaemia8 but have proved either toxic or ineffective in reducing CVD events, as was the case with aleglitazar in the ALECARDIO study.25 Novel combined PPAR agonists have sought to combine PPAR-α/δ activity to maintain the lipid benefits and reduce muscle-based insulin resistance.8 There is a need for CVD event trials in patients with residual high triglycerides after statin therapy and this may be where these agents are investigated.

Omega-3 fatty acids (docosahoexaenoic acid and eicosapentaenoic acid) at high doses reduce triglycerides in a dose-proportional manner and have anti-inflammatory effects at all doses. Low dose omega-3 fatty acids did reduce CVD events in the GISSI-P and JELIS trials but had no effect on CVD rates in the ORIGIN study in patients with diabetes/impaired fasting glucose. Meta-analyses suggest they add little at low doses to placebo or to other treatments including statin therapies.26 Many novel preparations of omega-3 fatty acids are in development but it remains to be seen whether they will be of any use in CVD prevention.

Orphan drug therapies

A number of orphan drug therapies have been developed for ultra-rare lipid disorders. Patients with homozygous FH (HoFH) have vastly increased LDL-C and CVD rates and typically die by age 30. They have a limited response to statins and many require treatment with lipid apheresis. Orphan drugs targeting the synthesis of apolipoprotein B particles have been developed. Mipomersen, an ASO, targets the apolipoprotein B mRNA, and reduces LDL-C by 25% in HoFH. It has problems with injection site reactions and hepatic steatosis but has an orphan drug license in the USA.27 Lomitapide, a microsomal transfer protein inhibitor, targets the lipidation of apolipoprotein B and can reduce LDL-C by 50% in HoFH. It causes profound hepatic steatosis and transaminase elevations.28 In addition, one case report suggests that lomitapide may be effective in the treatment of homozygous lipoprotein lipase deficiency (LPLD; familial chylomicronaemia).29 Lomitapide is licensed for HoFH in Europe. Alipogene tiparvovec is a gene therapy approach licensed in Europe which uses an adeno-associated virus vector to introduce LPL into muscle, reducing the incidence of pancreatitis in LPLD without obvious long-term effects on triglyceride levels.30

Conclusions

Many new lipid-lowering therapies are in development. The success of statins makes demonstrating the additional benefits of further lipid-lowering a difficult task. However the high efficacy on LDL-C and good safety profile of PCSK-9 inhibitors, and the high efficacy of CETP inhibitors in reducing LDL-C and raising HDL-C, means that if the clinical outcome trials are successful then these agents may be added to protocols for patients with the highest risks of developing recurrent or new onset CVD.

Conflict of interest

The authors have no conflicts of interest to declare. Professor Wierzbicki was chair of the NICE lipid modification guidelines (update) committee. The views in this article are his own and do not represent those of the committee.

  • © 2014 Royal College of Physicians

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Dyslipidaemia: what's around the corner?
Anthony S Wierzbicki, Dilinika Perera, Mfon Ewang-Emukowhate
Clinical Medicine Dec 2014, 14 (Suppl 6) s41-s44; DOI: 10.7861/clinmedicine.14-6-s41

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Dyslipidaemia: what's around the corner?
Anthony S Wierzbicki, Dilinika Perera, Mfon Ewang-Emukowhate
Clinical Medicine Dec 2014, 14 (Suppl 6) s41-s44; DOI: 10.7861/clinmedicine.14-6-s41
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  • Article
    • ABSTRACT
    • Introduction
    • The guidelines debate
    • New lipid-lowering drugs for LDL-cholesterol
    • Inhibition of pro-protein convertase subtilisin/kexin 9
    • Interventions to raise HDL-cholesterol
    • Interventions on triglycerides
    • Orphan drug therapies
    • Conclusions
    • Conflict of interest
    • References
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