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Published on: August 28, 2018
Serious adverse events and deaths in PCSK9 inhibitor trials reported on ClinicalTrials.gov: a systematic review
F H van Bruggen1, G B J Nijhuis1, S U Zuidema1
1University of Groningen, University Medical Center Groningen, Department of General Practice and Elderly Care Medicine , Groningen, The Netherlands.
Background:
Previous reviews of PCSK9 inhibitor trials are limited by a focus on composite cardiovascular outcomes. ClinicalTrials.gov provides trial results for individual clinical outcomes. Aim of this systematic review was to assess the effect of PCSK9 inhibitors on the risk of myocardial infarction, stroke/TIA, heart failure, diabetes mellitus, neurocognitive events, all-cause serious adverse events (SAE), and all-cause deaths as registered on ClinicalTrials.gov.
Methods:
PubMed, regulatory reports, ClinicalTrials.gov, and company websites were used to search studies. Randomized trials comparing PCSK9 inhibitor with placebo in participants with hypercholesterolemia were eligible. Study characteristics, risk of bias, and numbers of participants with the outcomes of interest were collected.
Results:
We identified 33 lipid-lowering and 4 clinical outcomes trials with results on ClinicalTrials.gov (n = 16,958 and n = 73,836, respectively). Risk of bias was generally high. PCSK9 inhibitors did not affect the risk of any of the investigated outcomes in either type of trial. However, in clinical outcomes studies, alirocumab decreased the risk of all-cause SAE (OR 0.92; 95% CI 0.86-0.98), and evolocumab probably increased the risk of mortality (OR 1.12; 95% CI 1.00-1.25).
Conclusions:
Our meta-analysis of clinical events registered on ClinicalTrials.gov did not show that PCSK9 inhibitors improve cardiovascular health. Evolocumab increased the risk of all-cause mortality.
Insights
PCSK9 inhibitors did not improve cardiovascular health in trials. Evolocumab, a PCSK9 inhibitor, was associated with an increased risk of all-cause mortality, necessitating further investigation.
Area of Science:
- Cardiovascular Medicine
- Pharmacology
Background:
- Previous reviews on PCSK9 inhibitors focused on composite outcomes.
- ClinicalTrials.gov offers data on individual clinical outcomes.
Purpose of the Study:
- To assess PCSK9 inhibitors' effect on myocardial infarction, stroke/TIA, heart failure, diabetes, neurocognitive events, SAEs, and deaths.
- To analyze individual clinical outcomes registered on ClinicalTrials.gov.
Main Methods:
- Systematic review of randomized trials comparing PCSK9 inhibitors with placebo.
- Searched PubMed, regulatory reports, ClinicalTrials.gov, and company websites.
- Collected data on study characteristics, risk of bias, and participant outcomes.
Main Results:
- 33 lipid-lowering and 4 clinical outcomes trials identified (n=16,958 and n=73,836).
- High risk of bias noted in studies.
- PCSK9 inhibitors did not impact investigated outcomes; however, alirocumab reduced SAEs, and evolocumab possibly increased mortality.
Conclusions:
- Meta-analysis of ClinicalTrials.gov data indicates PCSK9 inhibitors do not enhance cardiovascular health.
- Evolocumab use was linked to a higher risk of all-cause mortality.
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