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Universal screening at age 1-2 years as an adjunct to cascade testing for familial hypercholesterolaemia in the UK: A
Ailsa J McKay1, Helen Hogan2, Steve E Humphries3
1London School of Hygiene and Tropical Medicine, London, UK; Department of Primary Care and Public Health, Imperial College London, London, UK.
Insights
Universal cholesterol screening followed by genetic testing and reverse cascade testing is a cost-effective strategy for diagnosing familial hypercholesterolaemia (FH) in the UK. This approach improves upon current methods for identifying individuals with FH.
Area of Science:
- Cardiovascular Medicine
- Genetics
- Public Health
Background:
- Familial hypercholesterolaemia (FH) remains significantly underdiagnosed globally.
- Cascade testing (CT) is effective but relies on identifying index cases.
- Recent studies show universal screening (US) in early childhood is feasible.
Purpose of the Study:
- To evaluate the cost-effectiveness of universal cholesterol screening (US) as an adjunct to cascade testing (CT) for familial hypercholesterolaemia (FH) in the UK.
- To compare various US strategies with no screening.
Main Methods:
- Seven cholesterol and/or mutation-based US strategies with or without reverse cascade testing (RCT) were compared against no US.
- A decision model estimated costs and outcomes, utilizing UK CT data for RCT case ascertainment.
- Probabilistic Markov models and Monte Carlo simulations (n=1000 per model) assessed lifetime costs and health outcomes.
Main Results:
- A strategy of cholesterol screening, diagnostic genetic testing, and RCT emerged as the most cost-effective.
- The incremental cost-effectiveness ratio (ICER) was £12,480 per quality-adjusted life year (QALY).
- Cost-effectiveness remained robust across sensitivity and threshold analyses.
Conclusions:
- Universal cholesterol screening followed by genetic testing and RCT is recommended for FH diagnosis in the UK.
- This strategy aligns with the UK's conventional willingness-to-pay threshold.
- Implementation of this comprehensive screening approach is supported by the findings.
Background And Aims:
Familial hypercholesterolaemia (FH) is widely underdiagnosed. Cascade testing (CT) of relatives has been shown to be feasible, acceptable and cost-effective in the UK, but requires a supply of index cases. Feasibility of universal screening (US) at age 1-2 years was recently demonstrated. We examined whether this would be a cost-effective adjunct to CT in the UK, given the current and plausible future undiagnosed FH prevalence.
Methods:
Seven cholesterol and/or mutation-based US ± reverse cascade testing (RCT) alternatives were compared with no US in an incremental analysis with a healthcare perspective. A decision model was used to estimate costs and outcomes for cohorts exposed to the US component of each strategy. RCT case ascertainment was modelled using recent UK CT data, and probabilistic Markov models estimated lifetime costs and health outcomes for the cohorts screened under each alternative. 1000 Monte Carlo simulations were run for each model, and average outcomes reported. Further uncertainty was explored deterministically. Threshold analysis investigated the association between undiagnosed FH prevalence and cost-effectiveness.
Results:
A strategy involving cholesterol screening followed by diagnostic genetic testing and RCT was the most cost-effective modelled (incremental cost-effectiveness ratio (ICER) versus no US £12,480/quality adjusted life year (QALY); probability of cost-effectiveness 96·8% at £20,000/QALY threshold). Cost-effectiveness was robust to both deterministic sensitivity analyses and threshold analyses that modelled ongoing case ascertainment at theoretical maximum levels.
Conclusions:
These findings support implementation of universal cholesterol screening followed by diagnostic genetic testing and RCT for FH, under a UK conventional willingness-to-pay threshold.
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