Cost-effectiveness of cholesterol-lowering drugs for secondary cardiovascular prevention in the UK: ezetimibe, evolocumab, and alirocumab

Background

Despite statin treatment, patients with elevated low-density lipoprotein cholesterol (LDL-C) levels remain at high risk for acute cardiovascular events. Ezetimibe, evolocumab, and alirocumab were consequently developed to reduce the risk of recurrent ischemic events in patients with established cardiovascular diseases by 6%, 15%, and 15%, respectively. However, these novel treatments must demonstrate both clinical efficacy and cost-effectiveness to promote long-term adoption by patients, physicians, and insurers.

Objective

To assess the cost-effectiveness of statins in combination with ezetimibe, evolocumab, and alirocumab for secondary cardiovascular prevention from the perspective of England's National Health Service (NHS).

Methods

The incidence of major adverse cardiovascular events, including, myocardial infarction, stroke, angina, and coronary revascularization, was simulated with a Markov cohort model. The model was populated with transition probabilities and hazard ratios derived from cardiovascular outcome trials for statin combinations with ezetimibe (IMPROVE-IT), evolocumab (FOURIER), and alirocumab (ODYSSEY). Costs and utilities were retrieved from previous literature. Principle outcomes of interest were the incremental cost-effectiveness ratios (ICER) per quality-adjusted life year (QALY) gained in 2021 Great Britain Pounds (£). Univariate, scenario, willingness-to-pay, and probabilistic sensitivity analyses were conducted to assess the robustness of results.

Results

For secondary cardiovascular prevention, ezetimibe in combination with statins increased QALYs gained by 0.60 at cost reductions of −£2,529 (ICER: −4,231 £/QALY) per patients compared to statin monotherapy. Proprotein convertase subtilisin/kexin type 9 (PCSK9) inhibitors provided incremental QALYs of 0.53 and 0.86 at costs of £45,279 and £46,375 for evolocumab (ICER: 75,283 £/QALY) and alirocumab (ICER: 40,708 £/QALY), respectively. At the NHS' willingness-to-pay threshold of 30,000 £/QALY, there is 100% probability for ezetimibe and 0% probability for PCSK9 inhibitors to be cost-effective in secondary prevention. Results remained robust under univariate, scenario, and probabilistic sensitivity analyses.

Conclusions

Ezetimibe is cost-effective for secondary cardiovascular prevention at an annual price of £346 in the UK. For PCSK9 inhibitors, discounts of −37% to −53% on alirocumab's (£4,412) and evolocumab's (£4,467) prices are necessary to achieve cost-effectiveness.

Funding Acknowledgement

Type of funding sources: None.

Cost-effectiveness of icosapent ethyl for primary and secondary cardiovascular prevention in the UK

Background

Treatment with icosapent ethyl reduces the risk of major adverse cardiovascular events by 25% in patients with hypertriglyceridemia compared to placebo as demonstrated by The Reduction of Cardiovascular Events with Icosapent Ethyl-Intervention Trial (REDUCE-IT).

Objective

To assess the cost-effectiveness of icosapent ethyl, the purified eicosapentaenoic acid ethyl ester, in combination with statins compared to statin monotherapy for primary and secondary cardiovascular prevention from the perspective of England's National Health Service (NHS).

Methods

A Markov model simulated the progression of cardiovascular diseases and acute events, including myocardial infarction, stroke, angina, and coronary revascularization, in dyslipidaemia patients. The model was populated with cardiovascular outcome data derived from the REDUCE-IT trial. Cost and utility data were extracted from peer-reviewed literature. The incremental cost-effectiveness ratio (ICER) is reported per quality-adjusted life year (QALY) gained in 2021 Great Britain Pounds (£). Univariate, scenario, willingness-to-pay, and probabilistic sensitivity analyses were conducted to assess the robustness of results.

Results

For primary cardiovascular prevention, icosapent ethyl increased QALYs gained by 0.79 and costs by £15,421 compared to statin monotherapy (ICER: 19,485 £/QALY). For secondary prevention, the omega-3 fatty acid, icosapent ethyl, extended QALYs by 0.98 for patients at costs of £12,981 (ICER: 13,285 £/QALY). At the NHS' willingness-to-pay threshold of 25,000 £/QALY, there is 98% and 100% probability icosapent ethyl is cost-effective in primary and secondary prevention, respectively. Results remained robust under univariate, scenario, and probabilistic sensitivity analyses.

Conclusion

Icosapent ethyl is cost-effective for primary and secondary cardiovascular prevention at an annual price of £2,064 in the UK.

Funding Acknowledgement

Type of funding sources: None.

Detection of invasive pulmonary aspergillosis in critically ill patients by combined use of conventional culture, galactomannan, 1-3-beta-D-glucan and Aspergillus specific nested polymerase chain reaction in a prospective pilot study

Invasive pulmonary aspergillosis (IPA) is an emerging and life-threatening infectious disease in patients admitted to the intensive care unit (ICU). Most diagnostic studies are conducted in hematological patients and results cannot readily be transferred to ICU patients lacking classical host factors. In a multicenter, prospective clinical trial including 44 ICU patients, hematological (n = 14) and non-hematological patients (n = 30), concurrent serum and bronchoalveolar lavage (BAL) samples were analyzed by conventional culture, galactomannan (GM), 1-3-beta-D-glucan (BDG) as well as an Aspergillus specific nested polymerase chain reaction (PCR). Nine patients (20%) had putative IPA according to AspICU classification. GM and PCR showed superior performance in BAL with sensitivity/specificity of 56%/94% and 44%/94% compared to 33%/97% and 11%/94% in serum. Despite better sensitivity of 89%, BDG showed poor specificity of only 31% (BAL) and 26% (serum). Combination of GM and PCR (BAL) with BDG (serum) resulted in 100% sensitivity, but also reduced specificity to 23%. Whereas mean GM levels were significantly higher in hematological patients BDG and PCR did not differ between hematological and non-hematological patients. Under present clinical conditions test combinations integrating both BAL and blood samples are advantageous. BDG might best serve as possible indicator for ruling out IPA.

TRIAL REGISTRATION

ClinicalTrials.gov Identifier: NCT01695499. First posted: September 28, 2012, last update posted: May 8, 2017.

Diagnostic Performance of Contrast Enhanced Pulmonary Computed Tomography Angiography for the Detection of Angioinvasive Pulmonary Aspergillosis in Immunocompromised Patients

Invasive pulmonary aspergillosis (IPA) is one of the major complications in immunocompromised patients. The mainstay of diagnostic imaging is non-enhanced chest-computed-tomography (CT), for which various non-specific signs for IPA have been described. However, contrast-enhanced CT pulmonary angiography (CTPA) has shown promising results, as the vessel occlusion sign (VOS) seems to be more sensitive and specific for IPA in hematologic patients. The aim of this study was to evaluate the diagnostic accuracy of CTPA in a larger cohort including non-hematologic immunocompromised patients. CTPA studies of 78 consecutive immunocompromised patients with proven/probable IPA were analyzed. 45 immunocompromised patients without IPA served as a control group. Diagnostic performance of CTPA-detected VOS and of radiological signs that do not require contrast-media were analyzed. Of 12 evaluable radiological signs, five were found to be significantly associated with IPA. The VOS showed the highest diagnostic performance with a sensitivity of 0.94, specificity of 0.71 and a diagnostic odds-ratio of 36.8. Regression analysis revealed the two strongest independent radiological predictors for IPA to be the VOS and the halo sign. The VOS is highly suggestive for IPA in immunocompromised patients in general. Thus, contrast-enhanced CTPA superior over non-contrast_enhanced chest-CT in patients with suspected IPA.

Identification of invasive fungal diseases in immunocompromised patients by combining an Aspergillus specific PCR with a multifungal DNA-microarray from primary clinical samples

The increasing incidence of invasive fungal diseases (IFD), most of all invasive aspergillosis (IA) in immunocompromised patients emphasises the need to improve the diagnostic tools for detection of fungal pathogens. We investigated the diagnostic performance of a multifungal DNA-microarray detecting 15 different fungi [Aspergillus, Candida, Fusarium, Mucor, Rhizopus, Scedosporium and Trichosporon species (spp.)] in addition to an Aspergillus specific polymerase chain reaction (PCR) assay. Biopsies, bronchoalveolar lavage and peripheral blood samples of 133 immunocompromised patients (pts) were investigated by a multifungal DNA-microarray as well as a nested Aspergillus specific PCR assay. Patients had proven (n = 18), probable (n = 29), possible (n = 48) and no IFD (n = 38) and were mostly under antifungal therapy at the time of sampling. The results were compared to culture, histopathology, imaging and serology, respectively. For the non-Aspergillus IFD the microarray analysis yielded in all samples a sensitivity of 64% and a specificity of 80%. Best results for the detection of all IFD were achieved by combining DNA-microarray and Aspergillus specific PCR in biopsy samples (sensitivity 79%; specificity 71%). The molecular assays in combination identify genomic DNA of fungal pathogens and may improve identification of causative pathogens of IFD and help overcoming the diagnostic uncertainty of culture and/or histopathology findings, even during antifungal therapy.