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Valuing Health Gain from Composite Response Endpoints for Multisystem Diseases
Sean P Gavan1, Ian N Bruce2, Katherine Payne1
1Manchester Centre for Health Economics, Division of Population Health, Health Services Research and Primary Care, School of Health Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester Academic Health Science Centre, Manchester, England, UK.
Estimating health gain in multisystem diseases is crucial. Achieving response criteria, like Major Clinical Response, significantly increases quality-adjusted life-years (QALYs) and provides substantial monetary benefits.
Area of Science:
- Health Economics
- Clinical Research
- Multisystem Diseases
Background:
- Composite response endpoints are increasingly used to assess treatment effectiveness in multisystem diseases.
- Quantifying the associated health gain is essential for health technology assessment and economic evaluations.
Purpose of the Study:
- To demonstrate a method for estimating the health gain experienced by patients with multisystem diseases upon achieving a condition-specific composite response endpoint.
- To evaluate the health utility values, quality-adjusted life-years (QALYs), and monetary benefits associated with achieving response criteria.
Main Methods:
- Utilized data from systemic lupus erythematosus patients in routine practice.
- Developed and applied two bespoke composite response endpoints: Major Clinical Response and Improvement.
- Employed difference-in-differences regression to compare health utility values (EQ-5D) between responders and non-responders over 6 months.
- Used bootstrapped regression to estimate incremental QALYs, probability of QALY gain, and population monetary benefit.
Main Results:
- At 6 months, 18.2% achieved Major Clinical Response and 49.1% achieved Improvement.
- Incremental health utility values were 0.0923 for Major Clinical Response and 0.0454 for Improvement.
- Expected incremental QALY gain was 0.020 for Major Clinical Response and 0.012 for Improvement, with probabilities of QALY gain at 77.6% and 72.7%, respectively.
- Population monetary benefits were substantial: £1,106,458 for Major Clinical Response and £649,134 for Improvement.
Conclusions:
- Composite response endpoints can be effectively linked to measurable health utility gains.
- This methodology enhances the utility of composite endpoints for health technology assessment, decision-making, and economic evaluations.
- Quantifying health gain associated with response criteria is vital for understanding the true value of treatments for multisystem diseases.
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