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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Cardiovasc. Med.</journal-id>
<journal-title>Frontiers in Cardiovascular Medicine</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Cardiovasc. Med.</abbrev-journal-title>
<issn pub-type="epub">2297-055X</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.3389/fcvm.2024.1308695</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Cardiovascular Medicine</subject>
<subj-group>
<subject>Mini Review</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Effect of statin add-on therapy on cardiovascular mortality</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author" corresp="yes"><name><surname>Nelson</surname><given-names>John R.</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="corresp" rid="cor1">&#x002A;</xref><uri xlink:href="https://loop.frontiersin.org/people/2536818/overview"/><role content-type="https://credit.niso.org/contributor-roles/writing-review-editing/"/></contrib>
<contrib contrib-type="author"><name><surname>Le</surname><given-names>Viet</given-names></name>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref><uri xlink:href="https://loop.frontiersin.org/people/2308077/overview" /><role content-type="https://credit.niso.org/contributor-roles/writing-review-editing/"/></contrib>
<contrib contrib-type="author"><name><surname>Anderson</surname><given-names>Jeffrey L.</given-names></name>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref><role content-type="https://credit.niso.org/contributor-roles/writing-review-editing/"/></contrib>
<contrib contrib-type="author"><name><surname>Ciffone</surname><given-names>Nicole</given-names></name>
<xref ref-type="aff" rid="aff4"><sup>4</sup></xref><role content-type="https://credit.niso.org/contributor-roles/writing-review-editing/"/></contrib>
</contrib-group>
<aff id="aff1"><label><sup>1</sup></label><institution>California Cardiovascular Institute</institution>, <addr-line>Fresno, CA</addr-line>, <country>United States</country></aff>
<aff id="aff2"><label><sup>2</sup></label><institution>Intermountain Heart Institute, Intermountain Health</institution>, <addr-line>Salt Lake, UT</addr-line>, <country>United States</country></aff>
<aff id="aff3"><label><sup>3</sup></label><institution>Department of Physician Assistant Studies, College of Medical and Health Professional Science, Rocky Mountain University of Health Professions</institution>, <addr-line>Provo, UT</addr-line>, <country>United States</country></aff>
<aff id="aff4"><label><sup>4</sup></label><institution>Arizona Center for Advanced Lipidology</institution>, <addr-line>Tucson, AZ</addr-line>, <country>United States</country></aff>
<author-notes>
<fn fn-type="edited-by"><p><bold>Edited by:</bold> Matthew Budoff, Lundquist Institute for Biomedical Innovation, United States</p></fn>
<fn fn-type="edited-by"><p><bold>Reviewed by:</bold> Federica Fogacci, University of Bologna, Italy</p>
<p>Florentina Ligia Furtunescu, Carol Davila University of Medicine and Pharmacy, Romania</p></fn>
<corresp id="cor1"><label>&#x002A;</label><bold>Correspondence:</bold> John R. Nelson <email>jr4nelson@yahoo.com</email></corresp>
</author-notes>
<pub-date pub-type="epub"><day>13</day><month>03</month><year>2024</year></pub-date>
<pub-date pub-type="collection"><year>2024</year></pub-date>
<volume>11</volume><elocation-id>1308695</elocation-id>
<history>
<date date-type="received"><day>06</day><month>10</month><year>2023</year></date>
<date date-type="accepted"><day>27</day><month>02</month><year>2024</year></date>
</history>
<permissions>
<copyright-statement>&#x00A9; 2024 Nelson, Le, Anderson and Ciffone.</copyright-statement>
<copyright-year>2024</copyright-year><copyright-holder>Nelson, Le, Anderson and Ciffone</copyright-holder><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/4.0/">
<p>This is an open-access article distributed under the terms of the <ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution License (CC BY)</ext-link>. The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</p></license>
</permissions>
<abstract>
<sec><title>Introduction</title>
<p>Cardiovascular (CV) disease remains a leading cause of mortality despite statin therapy. Statin add-on lipid-lowering therapies have been investigated for CV risk reduction, but their effect on CV mortality has not been reviewed.</p>
</sec>
<sec><title>Methods</title>
<p>This review describes CV outcomes trials of add-on therapies to statins, highlighting findings related to the primary composite CV endpoints and the more patient-centric endpoint of CV-related mortality.</p>
</sec>
<sec><title>Results</title>
<p>Add-on ezetimibe met its primary composite CV endpoint vs. statin alone (<italic>P&#x2009;</italic>&#x003D;&#x2009;0.016); however, the individual endpoint of death from CV causes did not differ between groups. Add-on therapy with proprotein convertase subtilisin/kexin type 9 inhibitors achieved the primary composite CV endpoints in the respective CV outcomes trials for alirocumab (<italic>P&#x2009;</italic>&#x003C;&#x2009;0.001) and evolocumab (<italic>P&#x2009;</italic>&#x003C;&#x2009;0.001); however, neither CV outcomes trial found a difference vs. placebo in CV-related mortality. In its CV outcomes trial, icosapent ethyl added to statin therapy significantly reduced the occurrence of the primary composite CV endpoint (<italic>P&#x2009;</italic>&#x003C;&#x2009;0.001) and the individual endpoint of risk of CV-related death (<italic>P&#x2009;</italic>&#x003D;&#x2009;0.03) vs. placebo. A CV outcomes trial of bempedoic acid monotherapy achieved its primary composite CV endpoint vs. placebo (<italic>P&#x2009;</italic>&#x003D;&#x2009;0.004) but not the endpoint of death from CV causes.</p>
</sec>
<sec><title>Discussion</title>
<p>Statin add-on therapies achieved their CV outcomes trial composite CV endpoints. Proprotein convertase subtilisin/kexin type 9 inhibitors and icosapent ethyl have approved indications for CV risk reduction. Only add-on therapy with icosapent ethyl demonstrated a significant reduction in CV mortality in the overall intent-to-treat population, possibly due to the unique pleiotropic mechanisms of eicosapentaenoic acid independent of lipid-lowering effects.</p>
</sec>
</abstract>
<kwd-group>
<kwd>cardiovascular mortality</kwd>
<kwd>bempedoic acid</kwd>
<kwd>eicosapentaenoic acid</kwd>
<kwd>ezetimibe</kwd>
<kwd>icosapent ethyl</kwd>
<kwd>proprotein convertase subtilisin/kexin type 9 inhibitors</kwd>
</kwd-group>
<contract-sponsor id="cn001">Amarin Pharma, Inc.</contract-sponsor>
<counts>
<fig-count count="1"/>
<table-count count="1"/><equation-count count="0"/><ref-count count="42"/><page-count count="0"/><word-count count="0"/></counts><custom-meta-wrap><custom-meta><meta-name>section-at-acceptance</meta-name><meta-value>Cardiovascular Pharmacology and Drug Discovery</meta-value></custom-meta></custom-meta-wrap>
</article-meta>
</front>
<body>
<sec id="s1" sec-type="intro"><label>1</label><title>Introduction</title>
<p>Cardiovascular disease (CVD) is the leading cause of death worldwide, accounting for 32&#x0025; of deaths (<xref ref-type="bibr" rid="B1">1</xref>). Globally, 17.9 million CVD-related deaths occurred in 2019, most (85&#x0025;) due to myocardial infarction (MI) and stroke (<xref ref-type="bibr" rid="B1">1</xref>). In the United States, heart disease was the leading cause of death in 2021, with an age-adjusted death rate of 173.8 per 100,000 persons, and stroke was the fifth leading cause of death with a rate of 41.1 per 100,000 persons (<xref ref-type="bibr" rid="B2">2</xref>).</p>
<p>For more than 3 decades, the lowering of low-density lipoprotein cholesterol (LDL-C) levels has been the primary treatment target for primary and secondary prevention of cardiovascular (CV) events, with statins at the forefront of CV risk reduction (<xref ref-type="bibr" rid="B3">3</xref>, <xref ref-type="bibr" rid="B4">4</xref>). Despite achievement of LDL-C targets with high-dose statins, residual CV risk, including CV-related mortality risk, persists for many patients (<xref ref-type="bibr" rid="B5">5</xref>&#x2013;<xref ref-type="bibr" rid="B7">7</xref>). Thus, adjunctive therapy to statins to achieve additional CV risk reduction is an area of clinical and research interest. Several novel, add-on lipid-lowering therapies have been approved in the post-statin era, including ezetimibe, proprotein convertase subtilisin/kexin type 9 (PCSK9) inhibitors, icosapent ethyl (IPE), and bempedoic acid (<xref ref-type="bibr" rid="B8">8</xref>&#x2013;<xref ref-type="bibr" rid="B12">12</xref>). The potential for CV risk reduction with these novel therapies has been investigated in landmark CV outcomes trials (<xref ref-type="bibr" rid="B13">13</xref>&#x2013;<xref ref-type="bibr" rid="B17">17</xref>).</p>
<p>Cardiovascular outcomes trials typically assess efficacy using time-to-event analysis with the primary composite endpoint defined as time from randomization to time of first occurrence of any component of the composite endpoint (<xref ref-type="bibr" rid="B18">18</xref>). For example, a composite endpoint such as a major adverse cardiac event could include CV-related death or reinfarction, target vessel revascularization for ischemia, or stroke (<xref ref-type="bibr" rid="B18">18</xref>). From methodologic and regulatory standpoints, composite endpoints are pragmatic because they help ensure that sample sizes are not prohibitively high and durations of follow-up are not unreasonably long (<xref ref-type="bibr" rid="B18">18</xref>, <xref ref-type="bibr" rid="B19">19</xref>). Use of composite endpoints increases the numbers of events that are captured and, consequently, increases statistical power and precision (<xref ref-type="bibr" rid="B19">19</xref>). A downside of using composite endpoints is that inclusion of components that may be less affected by the treatment can dilute or mask true treatment effects (<xref ref-type="bibr" rid="B18">18</xref>, <xref ref-type="bibr" rid="B19">19</xref>); likewise, treatment effects on individual components of the composite endpoint may not be readily discerned. Although composite CV endpoints are useful in research, they are not particularly &#x201C;patient-centric&#x201D; and may not accurately reflect what patients deem to be the most important outcome(s) of an intervention (<xref ref-type="bibr" rid="B20">20</xref>, <xref ref-type="bibr" rid="B21">21</xref>). We considered that the impact of add-on therapy on CV-related mortality [encompassing sudden cardiac death or death due to either acute MI, heart failure, stroke, CV procedure, CV hemorrhage, other CV causes (<xref ref-type="bibr" rid="B22">22</xref>)] may be a more patient-centric endpoint than a composite CV endpoint that encompasses CV-related mortality along with nonfatal CV events and CV procedures.</p>
<p>This brief review discusses CV outcomes trials of novel add-on therapies to statins, highlighting evidence for overall CV risk reduction and for CV-related mortality risk reduction.</p>
</sec>
<sec id="s2" sec-type="methods"><label>2</label><title>Methods</title>
<p>A search of the contemporary literature (2013&#x2013;2023) was conducted in PubMed/MEDLINE and clinicaltrials.gov to identify clinical trials that investigated the endpoints of CV risk reduction and CV-related mortality risk reduction among patients treated with add-on therapy to statins. Articles were limited to those in English. The keywords for the literature search were: cardiovascular outcomes, statin therapy, and cardiovascular mortality. A total of 12 clinical trials were identified between 2013 and 2023 and discussed in this review.</p>
</sec>
<sec id="s3"><label>3</label><title>Cardiovascular outcomes trials of statin add-on therapy</title>
<sec id="s3a"><label>3.1</label><title>Ezetimibe</title>
<p>Ezetimibe, a selective inhibitor of intestinal cholesterol absorption, was first approved by the US Food and Drug Administration (FDA) in 2002 as a lipid-lowering agent, with indications that included adjunctive therapy to diet for reduction of elevated total cholesterol, LDL-C, and apolipoprotein B levels in patients with primary hyperlipidemia alone or in combination with a statin (<xref ref-type="bibr" rid="B23">23</xref>, <xref ref-type="bibr" rid="B24">24</xref>). Subsequently, lipid-lowering indications were further expanded, including for reduction of non&#x2013;high-density lipoprotein cholesterol levels alone or in combination with statins in patients with primary hyperlipidemia or in combination with fenofibrate in patients with mixed hyperlipidemia (<xref ref-type="bibr" rid="B23">23</xref>).</p>
<p>The landmark Improved Reduction of Outcomes: Vytorin Efficacy International Trial (IMPROVE-IT) was a double-blind, event-driven, randomized study of 18,144 patients aged 50 years or older who had been hospitalized for acute coronary syndrome (acute MI; high-risk unstable angina) within the prior 10 days (<xref ref-type="bibr" rid="B13">13</xref>). Patients on long-term lipid-lowering therapy were required to have an LDL-C level between 50&#x2005;mg per dL and 100&#x2005;mg per dL and patients not receiving long-term lipid-lowering therapy were required to have an LDL-C level between 50&#x2005;mg per dL and 125&#x2005;mg per dL. Patients were randomized to receive ezetimibe 10&#x2005;mg in combination with simvastatin 40&#x2005;mg vs. simvastatin 40&#x2005;mg and placebo to assess impact on CV outcomes over 7 years (<xref ref-type="bibr" rid="B13">13</xref>).</p>
<p>At 1 year, levels of LDL-C decreased from 93.8&#x2005;mg per dL at baseline (both groups) to 53.2&#x2005;mg per dL and 69.9&#x2005;mg per dL in the ezetimibe plus simvastatin group and the simvastatin monotherapy groups, respectively (significant difference between groups; <italic>P&#x2009;</italic>&#x003C;&#x2009;0.001) (<xref ref-type="bibr" rid="B13">13</xref>). These LDL-C reductions were maintained over the course of the 7-year study.</p>
<p>The combination treatment met its primary composite endpoint, which was assessed from randomization to the first occurrence of death from CVD, major coronary event (i.e., nonfatal MI, documented unstable angina requiring hospital admission, coronary revascularization occurring &#x2265;30 days after randomization), or nonfatal stroke (<xref ref-type="table" rid="T1">Table&#x00A0;1</xref>) (<xref ref-type="bibr" rid="B13">13</xref>). The event rate for the primary composite endpoint was 32.7&#x0025; in the combination ezetimibe and simvastatin group vs. 34.7&#x0025; in the simvastatin monotherapy group (HR 0.936; 95&#x0025; CI, 0.89&#x2013;0.99; <italic>P&#x2009;</italic>&#x003D;&#x2009;0.016) (<xref ref-type="bibr" rid="B13">13</xref>). Although ezetimibe met its primary composite endpoint of CV risk reduction, it is only approved by the US FDA for the reduction of lipid levels and is not approved for the reduction of CV risk (<xref ref-type="bibr" rid="B23">23</xref>).</p>
<table-wrap id="T1" position="float"><label>Table 1</label>
<caption><p>Overview of novel add-on therapies and cardiovascular risk reduction.</p></caption>
<table frame="hsides" rules="groups">
<colgroup>
<col align="left"/>
<col align="left"/>
<col align="center"/>
<col align="left"/>
<col align="left"/>
<col align="left"/>
</colgroup>
<thead>
<tr>
<th valign="top" align="left">Agent</th>
<th valign="top" align="center">Study (year)</th>
<th valign="top" align="center">Median duration</th>
<th valign="top" align="center">Primary composite CV endpoint<xref ref-type="table-fn" rid="table-fn2"><sup>a</sup></xref><sup>,</sup><xref ref-type="table-fn" rid="table-fn3"><sup>b</sup></xref></th>
<th valign="top" align="center">CV mortality endpoint<xref ref-type="table-fn" rid="table-fn3"><sup>b</sup></xref></th>
<th valign="top" align="center">Regulatory labeling for CV risk reduction</th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">Ezetimibe (<xref ref-type="bibr" rid="B13">13</xref>, <xref ref-type="bibr" rid="B23">23</xref>)</td>
<td valign="top" align="left">IMPROVE-IT (2015)</td>
<td valign="top" align="center">6 years</td>
<td valign="top" align="left">Significantly reduced in ezetimibe&#x2009;&#x002B;&#x2009;simvastatin vs simvastatin group</td>
<td valign="top" align="left">Tertiary endpoint; not significantly different between groups</td>
<td valign="top" align="left">Limitations of use: Effect on CV morbidity and mortality not yet determined</td>
</tr>
<tr>
<td valign="top" align="left">Alirocumab (<xref ref-type="bibr" rid="B9">9</xref>, <xref ref-type="bibr" rid="B15">15</xref>)</td>
<td valign="top" align="left">ODYSSEY OUTCOMES (2018)</td>
<td valign="top" align="center">2.8 years</td>
<td valign="top" align="left">Significantly reduced in alirocumab&#x2009;&#x002B;&#x2009;statin vs placebo&#x2009;&#x002B;&#x2009;statin group</td>
<td valign="top" align="left">Major secondary endpoint; not significantly different between groups</td>
<td valign="top" align="left">CV risk reduction-related indication: Reduce risk of MI, stroke, and unstable angina requiring hospital admission in adults with established CVD</td>
</tr>
<tr>
<td valign="top" align="left">Evolocumab (<xref ref-type="bibr" rid="B10">10</xref>, <xref ref-type="bibr" rid="B14">14</xref>)</td>
<td valign="top" align="left">FOURIER (2017)</td>
<td valign="top" align="center">2.2 years</td>
<td valign="top" align="left">Significantly reduced in evolocumab&#x2009;&#x002B;&#x2009;statin vs placebo&#x2009;&#x002B;&#x2009;statin group</td>
<td valign="top" align="left">Other secondary endpoint; not significantly different between groups</td>
<td valign="top" align="left">CV risk reduction-related indication: Adults with established CVD to reduce risk of MI, stroke, and coronary revascularization</td>
</tr>
<tr>
<td valign="top" align="left">Icosapent ethyl (<xref ref-type="bibr" rid="B11">11</xref>, <xref ref-type="bibr" rid="B16">16</xref>)</td>
<td valign="top" align="left">REDUCE-IT (2019)</td>
<td valign="top" align="center">4.9 years</td>
<td valign="top" align="left">Significantly reduced in IPE&#x2009;&#x002B;&#x2009;statin vs placebo&#x2009;&#x002B;&#x2009;statin group</td>
<td valign="top" align="left">Prespecified secondary endpoint; significantly reduced in IPE&#x2009;&#x002B;&#x2009;statin vs placebo&#x2009;&#x002B;&#x2009;statin group</td>
<td valign="top" align="left">CV risk reduction-related indication: Adjunct to maximally tolerated statin therapy to reduce risk of MI, stroke, coronary revascularization, and unstable angina requiring hospital admission in adults with elevated TG levels (&#x2265;150&#x2005;mg per dL) and either established CVD or diabetes mellitus with &#x2265;2 more risk factors for CVD</td>
</tr>
<tr>
<td valign="top" align="left">Bempedoic acid (<xref ref-type="bibr" rid="B12">12</xref>, <xref ref-type="bibr" rid="B17">17</xref>)</td>
<td valign="top" align="left">CLEAR Outcomes (2023)</td>
<td valign="top" align="center">3.4 years</td>
<td valign="top" align="left">Significantly reduced in bempedoic acid vs placebo group</td>
<td valign="top" align="left">Key secondary endpoint; not significantly different between groups</td>
<td valign="top" align="left">CV risk reduction is not mentioned</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn id="table-fn1"><p>CLEAR, Cholesterol Lowering via Bempedoic Acid, an ACL-Inhibiting Regimen; CV, cardiovascular; CVD, cardiovascular disease; FOURIER, Further Cardiovascular Outcomes Research With PCSK9 Inhibition in Subjects With Elevated Risk; IMPROVE-IT, Improved Reduction of Outcomes: Vytorin Efficacy International Trial; MI, myocardial infarction; NA, not applicable; PCSK9, proprotein convertase subtilisin/kexin type 9; REDUCE-IT, Reduction of Cardiovascular Events With Icosapent Ethyl&#x2013;Intervention Trial.</p></fn>
<fn id="table-fn2"><label><sup>a</sup></label><p>Components of the primary composite CV endpoints for each CV outcomes trial: IMPROVE-IT, death from CVD, major coronary event (i.e., nonfatal MI, documented unstable angina requiring hospital admission, coronary revascularization occurring &#x2265;30 d after randomization), or nonfatal stroke; ODYSSEY OUTCOMES, death from coronary heart disease, nonfatal MI, fatal/nonfatal ischemic stroke, or unstable angina requiring hospital admission; FOURIER, CV-related death, MI, stroke, hospital admission for unstable angina, or coronary revascularization; REDUCE-IT, CV-related death, nonfatal MI, nonfatal stroke, coronary revascularization, or unstable angina requiring hospitalization; CLEAR Outcomes, death from CV causes, nonfatal MI, nonfatal stroke, or coronary revascularization.</p></fn>
<fn id="table-fn3"><label><sup>b</sup></label><p>Intention-to-treat analysis.</p></fn>
</table-wrap-foot>
</table-wrap>
<p>Death from CV causes was a tertiary endpoint in IMPROVE-IT (<xref ref-type="bibr" rid="B13">13</xref>). When death from CV causes was separately considered from the primary composite endpoint, this component was not significantly different in the combination ezetimibe and simvastatin vs. statin monotherapy group (event rates of 6.9&#x0025; vs. 6.8&#x0025;, respectively; HR 1.0; 95&#x0025; CI, 0.89&#x2013;1.13; <italic>P&#x2009;</italic>&#x003D;&#x2009;1.00) (<xref ref-type="fig" rid="F1">Figure&#x00A0;1</xref>) (<xref ref-type="bibr" rid="B13">13</xref>).</p>
<fig id="F1" position="float"><label>Figure 1</label>
<caption><p>Hazard ratios of cardiovascular mortality for select lipid-lowering regimens from individual CV outcomes trials (<xref ref-type="bibr" rid="B13">13</xref>&#x2013;<xref ref-type="bibr" rid="B17">17</xref>). CV, cardiovascular; NR, not reported.</p></caption>
<graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="fcvm-11-1308695-g001.tif"/>
</fig>
</sec>
<sec id="s3b"><label>3.2</label><title>Proprotein convertase subtilisin/kexin type 9 inhibitors</title>
<sec id="s3b1"><label>3.2.1</label><title>Alirocumab</title>
<p>In 2015, the FDA approved the monoclonal antibody alirocumab, a PCSK9 inhibitor, as an adjunct to diet and maximally tolerated statin therapy for treatment of adults with heterozygous familial hypercholesterolemia or clinical atherosclerotic CVD who require additional LDL-C lowering (<xref ref-type="bibr" rid="B9">9</xref>, <xref ref-type="bibr" rid="B24">24</xref>). Subsequently, alirocumab received approval for CV risk reduction, specifically to reduce the risk of MI, stroke, and unstable angina requiring hospital admission in adults with established CVD (<xref ref-type="bibr" rid="B9">9</xref>). Approval of alirocumab for CV risk reduction was based on the pivotal, multicenter, event-driven, randomized, double-blind, placebo-controlled ODYSSEY OUTCOMES trial, which involved 18,924 patients aged 40 years or older hospitalized with acute coronary syndrome who were receiving maximally tolerated doses of either atorvastatin or rosuvastatin as well as add-on therapy with either alirocumab 75&#x2005;mg or placebo every 2 weeks over a median of 2.8 years (<xref ref-type="bibr" rid="B15">15</xref>).</p>
<p>Mean LDL-C levels in the alirocumab add-on group were markedly reduced from 92&#x2005;mg per dL at baseline to 40&#x2005;mg per dL at four months, and LDL-C levels in the alirocumab group increased to 66&#x2005;mg per dL by 48 months, remaining well below baseline levels; by contrast, LDL-C levels in the placebo add-on group increased to 103&#x2005;mg per dL over the same time period (<xref ref-type="bibr" rid="B15">15</xref>). The ODYSSEY OUTCOMES trial met its primary composite endpoint, which included death from coronary heart disease, nonfatal MI, fatal or nonfatal ischemic stroke, or unstable angina requiring hospital admission (<xref ref-type="table" rid="T1">Table&#x00A0;1</xref>). Event rates for the primary composite endpoint were 9.5&#x0025; in the alirocumab add-on group and 11.1&#x0025; in the placebo add-on group (HR 0.85; 95&#x0025; CI, 0.78&#x2013;0.93; <italic>P&#x2009;</italic>&#x003C;&#x2009;0.001). Death from CV-related causes, a major secondary endpoint in ODYSSEY OUTCOMES, did not significantly differ between the treatment groups. Event rates were 2.5&#x0025; in the alirocumab add-on group compared with 2.9&#x0025; in the placebo add-on group (HR 0.88; 95&#x0025; CI, 0.74&#x2013;1.05) (<xref ref-type="fig" rid="F1">Figure&#x00A0;1</xref>). No <italic>P</italic> value was reported for this CV mortality endpoint because hierarchical analysis was stopped after the first nonsignificant <italic>P</italic> value was observed for death from coronary heart disease (<italic>P&#x2009;</italic>&#x003D;&#x2009;0.38) (<xref ref-type="bibr" rid="B15">15</xref>).</p>
</sec>
<sec id="s3b2"><label>3.2.2</label><title>Evolocumab</title>
<p>The monoclonal antibody evolocumab, a PCSK9 inhibitor, received FDA approval in 2015 (<xref ref-type="bibr" rid="B10">10</xref>). Initial indications included use as an adjunct to diet added to (a) maximally tolerated statin therapy for treatment of adults with heterozygous familial hypercholesterolemia or clinical atherosclerotic CVD who require additional LDL-C lowering or (b) to other LDL-lowering therapies (e.g., statins, ezetimibe) in patients with homozygous familial hypercholesterolemia who require additional LDL-C lowering (<xref ref-type="bibr" rid="B10">10</xref>, <xref ref-type="bibr" rid="B24">24</xref>). In 2021, an indication of CV risk reduction was added for evolocumab in adults with established CVD to reduce the risk of MI, stroke, and coronary revascularization (<xref ref-type="bibr" rid="B10">10</xref>). Findings from the Further Cardiovascular Outcomes Research With PCSK9 Inhibition in Subjects With Elevated Risk (FOURIER) were instrumental in helping evolocumab receive regulatory approval for CV risk reduction (<xref ref-type="bibr" rid="B10">10</xref>, <xref ref-type="bibr" rid="B14">14</xref>).</p>
<p>FOURIER was a multinational, randomized, double-blind, placebo-controlled, event-driven CV outcomes trial that assessed add-on therapy with evolocumab (140&#x2005;mg every 2 weeks or 420&#x2005;mg monthly) vs. add-on placebo in 27,564 patients treated with statins who were aged between 40 and 85 years with clinically evident atherosclerotic CVD (i.e., diagnosis of MI or nonhemorrhagic stroke, symptomatic peripheral artery disease) as well as additional CV risk factors (e.g., age &#x2265;65 years at randomization, current cigarette use, diabetes) for a median follow-up of approximately 2.2 years (<xref ref-type="bibr" rid="B14">14</xref>). Patients were required to be receiving an &#x201C;optimized regimen&#x201D; of lipid-lowering therapy (i.e., high-intensity statin with or without ezetimibe). In the evolocumab add-on group, median LDL-C levels decreased substantially from 92&#x2005;mg per dL at baseline to 30&#x2005;mg per dL within the first 12 weeks of treatment, with maintenance of this LDL-C reduction over time. Levels of LDL-C were relatively unchanged in the placebo add-on group. The primary endpoint, a composite of CV-related death, MI, stroke, hospital admission for unstable angina, or coronary revascularization, had a significantly lower event rate of 9.8&#x0025; in patients in the evolocumab add-on group vs. 11.3&#x0025; in patients in the placebo add-on group (HR 0.85; 95&#x0025; CI, 0.79&#x2013;0.92; <italic>P&#x2009;</italic>&#x003C;&#x2009;0.001) (<xref ref-type="table" rid="T1">Table&#x00A0;1</xref>) (<xref ref-type="bibr" rid="B14">14</xref>).</p>
<p>However, the individual component of CV-related death, which was one of several secondary endpoints in FOURIER, was not significantly reduced, with event rates of 1.8&#x0025; in patients in the evolocumab add-on group vs. 1.7&#x0025; in the placebo add-on group (HR 1.05; 95&#x0025; CI, 0.88&#x2013;1.25; <italic>P&#x2009;</italic>&#x003D;&#x2009;0.62) (<xref ref-type="fig" rid="F1">Figure&#x00A0;1</xref>) (<xref ref-type="bibr" rid="B14">14</xref>).</p>
</sec>
</sec>
<sec id="s3c"><label>3.3</label><title>Icosapent ethyl</title>
<p>Icosapent ethyl is a highly purified form of the omega-3 fatty acid eicosapentaenoic acid (EPA) ethyl ester that initially received FDA approval in 2012 as an adjunct to diet to reduce triglyceride (TG) levels in adults with severe hypertriglyceridemia (<xref ref-type="bibr" rid="B11">11</xref>, <xref ref-type="bibr" rid="B24">24</xref>). Following the results of the Reduction of Cardiovascular Events With Icosapent Ethyl&#x2013;Intervention Trial (REDUCE-IT) (<xref ref-type="bibr" rid="B16">16</xref>) in 2019, IPE received FDA approval for an indication related to CV risk reduction: as an adjunct to maximally tolerated statin therapy to reduce the risk of MI, stroke, coronary revascularization, and unstable angina requiring hospital admission in adults with elevated TG levels (&#x2265;150&#x2005;mg per dL) and either established CVD or diabetes mellitus with at least 2 additional risk factors for CVD (<xref ref-type="bibr" rid="B11">11</xref>, <xref ref-type="bibr" rid="B16">16</xref>).</p>
<p>REDUCE-IT was a phase 3b, multicenter, event-driven, randomized, double-blind, placebo-control led trial that compared add-on therapy with IPE 4&#x2005;g vs. addition of placebo in 8179 patients treated with statins aged 45 years or older with established CVD (secondary prevention) or aged 50 or older years with diabetes and at least one additional risk factor (primary prevention) over a median of 4.9 years (<xref ref-type="bibr" rid="B16">16</xref>). Eligible patients had fasting TG levels 150 to 499&#x2005;mg per dL and LDL-C levels 41 to 100&#x2005;mg per dL while receiving a stable dose of statin for at least 4 weeks. The median LDL-C level at baseline was 75&#x2005;mg per dL. Overall, 71&#x0025; of the patient population had established CVD and 58&#x0025; had type 2 diabetes mellitus (<xref ref-type="bibr" rid="B16">16</xref>).</p>
<p>The primary composite endpoint was a time-to-event analysis, including CV-related death, nonfatal MI, nonfatal stroke, coronary revascularization, or unstable angina (<xref ref-type="bibr" rid="B16">16</xref>). Add-on therapy with IPE significantly reduced the occurrence of the primary composite endpoint vs. addition of placebo, with event rates of 17.2&#x0025; vs. 22&#x0025; (HR 0.75; 95&#x0025; CI, 0.68&#x2013;0.83; <italic>P&#x2009;</italic>&#x003C;&#x2009;0.001) (<xref ref-type="table" rid="T1">Table&#x00A0;1</xref>). Notably, IPE also significantly reduced the risk of CV-related death, a prespecified secondary endpoint, with event rates of 4.3&#x0025; in the IPE add-on group vs. 5.2&#x0025; in the placebo group (HR 0.80; 95&#x0025; CI, 0.66&#x2013;0.98; <italic>P&#x2009;</italic>&#x003D;&#x2009;0.03) (<xref ref-type="fig" rid="F1">Figure&#x00A0;1</xref>) (<xref ref-type="bibr" rid="B16">16</xref>).</p>
</sec>
<sec id="s3d"><label>3.4</label><title>Bempedoic acid</title>
<p>In 2020, the FDA approved the adenosine triphosphate citrate lyase inhibitor bempedoic acid as an adjunct to diet and maximally tolerated statin therapy for treatment of adults with heterozygous familial hypercholesterolemia or established atherosclerotic CVD who require additional lowering of LDL-C levels (<xref ref-type="bibr" rid="B12">12</xref>, <xref ref-type="bibr" rid="B25">25</xref>). Approval was based on results from 2 pivotal phase 3, randomized, double-blind, placebo-controlled clinical trials, namely Cholesterol Lowering via Bempedoic Acid, an ACL-Inhibiting Regimen [CLEAR] Harmony (<xref ref-type="bibr" rid="B26">26</xref>) and CLEAR Wisdom (<xref ref-type="bibr" rid="B27">27</xref>). CLEAR Harmony and CLEAR Wisdom included 2,230 and 779 patients, respectively, with atherosclerotic CVD, heterozygous familial hypercholesterolemia, or both, who were receiving stable doses of maximally tolerated lipid-lowering therapy (<xref ref-type="bibr" rid="B26">26</xref>, <xref ref-type="bibr" rid="B27">27</xref>). While these were lipid-lowering studies, both reported rates of CV-related deaths among their adverse events. No significant differences were found in CV-related mortality between the add-on bempedoic acid and placebo groups in either study (<xref ref-type="bibr" rid="B26">26</xref>, <xref ref-type="bibr" rid="B27">27</xref>).</p>
<p>Recently, a CV outcomes trial was conducted to evaluate whether bempedoic acid may reduce CV risk. In the 2023, event-driven, CLEAR Outcomes trial, 13,970 patients intolerant to statins were randomized to receive bempedoic acid 180&#x2005;mg or placebo daily over a median of 40.6 months (<xref ref-type="bibr" rid="B17">17</xref>). After 6 months of treatment, LDL-C levels were reduced from the mean baseline level of 139&#x2005;mg per dL to 107&#x2005;mg per dL in the bempedoic acid group, while LDL-C level was relatively unchanged at 136&#x2005;mg per dL in the placebo group. The primary composite endpoint included death from CV causes, nonfatal MI, nonfatal stroke, or coronary revascularization. The CLEAR Outcomes achieved its primary composite efficacy endpoint, with significantly lower event rates of 11.7&#x0025; in the bempedoic acid group vs. 13.3&#x0025; of patients in the placebo group (HR 0.87; 95&#x0025; CI, 0.79&#x2013;0.96; <italic>P&#x2009;</italic>&#x003D;&#x2009;0.004) (<xref ref-type="table" rid="T1">Table&#x00A0;1</xref>). By contrast, death from CV causes, a key secondary endpoint, was not significantly different between groups, with event rates of 3.8&#x0025; and 3.7&#x0025; in the bempedoic acid and placebo groups, respectively (HR 1.04; 95&#x0025; CI, 0.88&#x2013;1.24) (<xref ref-type="fig" rid="F1">Figure&#x00A0;1</xref>). No <italic>P</italic> value was reported for this CV mortality endpoint because hierarchical analysis was stopped after the first nonsignificant <italic>P</italic> value was observed for fatal or nonfatal stroke (<italic>P&#x2009;</italic>&#x003D;&#x2009;0.16) (<xref ref-type="bibr" rid="B17">17</xref>).</p>
</sec>
<sec id="s3e"><label>3.5</label><title>Ongoing CV outcomes trials</title>
<p>Clinical trials evaluating CV outcomes are currently underway for several novel add-on lipid-lowering agents. The ORION-4 and VICTORION-2 Prevent trials are ongoing to determine whether treatment with inclisiran, a small interfering ribonucleic acid that inhibits hepatic PCSK9 production, decreases the risk of CV events (<xref ref-type="bibr" rid="B28">28</xref>). The PREVAIL trial is currently investigating whether obicetrapib, a cholesteryl ester transfer protein inhibitor, lowers the risk of CV events in patients with CVD on maximally tolerated lipid-modifying therapy (<xref ref-type="bibr" rid="B29">29</xref>, <xref ref-type="bibr" rid="B30">30</xref>). The impact of a reduction in lipoprotein (a) on CV outcomes is being investigated in two clinical trials: Lp(a) Horizon assesses pelacarsen, an antisense oligonucleotide, among patients with established CVD, and OCEAN(a) investigates olpasiran, a small interfering ribonucleic acid, among patients with prior MI or percutaneous coronary intervention (<xref ref-type="bibr" rid="B31">31</xref>&#x2013;<xref ref-type="bibr" rid="B33">33</xref>).</p>
</sec>
</sec>
<sec id="s4" sec-type="discussion"><label>4</label><title>Discussion</title>
<p>For clinicians caring for patients with established atherosclerotic CVD or with CV risk factors, knowledge that one of their patients has succumbed to a CV event brings into focus the finality of death. This stark reminder serves as a motivator to continue to strive for prevention of CV-related death. A comprehensive approach is essential and should not only optimize CV risk factors such as lipid levels, glucose levels, and blood pressure, but it should also address residual CV risk using add-on therapies.</p>
<p>This review found that ezetimibe, evolocumab, alirocumab, and IPE are effective, add-on, lipid-modulating therapies that can address the residual CV risk that persists in patients treated with statins. Additionally, bempedoic acid reduces CV risk in patients intolerant to statins. Each of these therapies has demonstrated significant reduction in CV risk in their respective CV outcomes trials, as measured by primary composite CV endpoints (<xref ref-type="bibr" rid="B13">13</xref>&#x2013;<xref ref-type="bibr" rid="B17">17</xref>); however, when they are separately examined, the more patient-centric outcome of CV-related mortality was only significantly reduced by IPE (<xref ref-type="fig" rid="F1">Figure&#x00A0;1</xref>) (<xref ref-type="bibr" rid="B13">13</xref>&#x2013;<xref ref-type="bibr" rid="B17">17</xref>). The impact of IPE in total CVD event reduction in REDUCE-IT was substantial; for every 1,000 patients treated with IPE over 5 years, approximately 159 total primary endpoints could be prevented, including 12 CV deaths, 42 MIs, 14 strokes, 76 coronary revascularizations, and 16 hospitalizations for unstable angina (<xref ref-type="bibr" rid="B34">34</xref>). Unlike other add-on therapies that primarily exert LDL-C-lowering effects, it is thought that the mechanisms underlying CV risk reduction with IPE are due to pleiotropic effects of EPA that extend beyond cholesterol and TG lowering. These pleiotropic effects of EPA have been extensively reviewed and include anti-inflammatory, anti-oxidation, anti-arrhythmic, anti-thrombotic, and anti-platelet mechanisms and cell membrane stability/signaling effects (<xref ref-type="bibr" rid="B35">35</xref>, <xref ref-type="bibr" rid="B36">36</xref>). Their importance is supported by the finding in REDUCE-IT that changes in serum EPA levels were associated with most of the observed CV risk reduction, with only minimal contribution by changes in TG, LDL-C, high-density lipoprotein cholesterol (HDL-C), non-HDL-C, apolipoprotein B, high-sensitivity C-reactive protein, and remnant lipoprotein cholesterol (<xref ref-type="bibr" rid="B35">35</xref>, <xref ref-type="bibr" rid="B37">37</xref>, <xref ref-type="bibr" rid="B38">38</xref>). Risk reductions with IPE were also similar across baseline LDL-C level categories, confirming LDL-C independent pathways are involved in its mechanism of action, in contrast to the other statin add-on agents described in this review. Of note, IPE is the only omega-3 fatty acid drug approved by the FDA to reduce CV risk, with consistent CV benefit and trends observed across studies, including REDUCE-IT (<xref ref-type="bibr" rid="B11">11</xref>, <xref ref-type="bibr" rid="B16">16</xref>), the recent Randomized Trial for Evaluation in Secondary Prevention Efficacy of Combination Therapy&#x2013;Statin and Eicosapentaenoic Acid (RESPECT-EPA) (<xref ref-type="bibr" rid="B39">39</xref>), and in an earlier EPA trial, the Japan EPA Lipid Intervention Study (<xref ref-type="bibr" rid="B40">40</xref>). Utilizing REDUCE-IT US event rates, FDA eligibility criteria, and National Health and Nutrition Examination Survey data, an estimated 4.6 million US adults would be eligible for IPE and 27,377 CV deaths would be prevented over 4.9 years (<xref ref-type="bibr" rid="B41">41</xref>, <xref ref-type="bibr" rid="B42">42</xref>).</p>
</sec>
</body>
<back>
<sec id="s5" sec-type="author-contributions"><title>Author contributions</title>
<p>JRN: Writing &#x2013; review &#x0026; editing. VL: Writing &#x2013; review &#x0026; editing. JLA: Writing &#x2013; review &#x0026; editing. NC: Writing &#x2013; review &#x0026; editing.</p>
</sec>
<sec id="s6" sec-type="funding-information"><title>Funding</title>
<p>The author(s) declare that financial support was received for the research, authorship, and/or publication of this article.</p>
<p>This review was sponsored by Amarin Pharma, Inc.</p>
</sec>
<ack><title>Acknowledgments</title>
<p>Medical writing and editorial support were provided by Kulvinder Singh, PharmD, Noud van Helmond, MD, PhD, and Sherri Damlo, MS, ELS at Peloton Advantage, LLC, an OPEN Health company (Parsippany, NJ), and were funded by Amarin Pharma, Inc.</p>
</ack>
<sec id="s7" sec-type="COI-statement"><title>Conflict of interest</title>
<p>JRN&#x2014;Speakers bureau for Amarin and Amgen; stock shareholder for Amgen; advisory board for Amarin. VL&#x2014;Research grant paid to department from Janssen; consultant for Novartis. JLA&#x2014;Site investigator for the ongoing ORION studies of inclisiran and the HORIZON study of pelacarsen, sponsored by Novartis; past investigator for trials for Milestone and SomaLogic; member of the Data and Safety Monitoring Board for a Faraday Pharma trial (receives no personal income). NC&#x2014;Consultant for Novartis and Amarin; speaker for Amgen; speaker consultant for Regeneron.</p>
</sec>
<sec id="s8" sec-type="disclaimer"><title>Publisher&#x0027;s note</title>
<p>All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p>
</sec>
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