THE COST-EFFECTIVENESS OF RANIBIZUMAB COMPARED TO PDT-V AND BSC FOR THE TREATMENT OF AGE-RELATED MACULAR DEGENERATION IN CANADA

Author(s)

Heide E Hass, MSc, Associate Manager, Health Economics and Pricing1, Greta Lozano-Ortega, MSc, Statistician & Health Economist2, Robert WA Machuk, BSc, Research Associate2, Martin Barbeau, MSc, Director, Health Economics and Pricing1, Mathen K Mathen, MD, FRCSC, Head W.R.H.A. Ophthalmology31Novartis Pharmaceuticals Canada Inc, Dorval, QC, Canada; 2 Oxford Outcomes, Vancouver, BC, Canada; 3 Misericordia Health Centre, Winnipeg, MB, Canada

Objective: To evaluate the cost-effectiveness of ranibizumab versus photodynamic therapy with verteporfin (PDT-V) and best standard care (BSC) for the treatment of all wet age-related macular degeneration (AMD) lesion subtypes (predominantly classic (PC), minimally classic (MC) and occult lesions (OC)) in Canada. Methods: A ten-year Markov model with three-month cycles was adapted to the Canadian setting to simulate the evolution of visual acuity (VA) levels in subfoveal wet AMD patients according to Canadian guidelines. Analyses were performed from the perspective of the Ontario Ministry of Health with each AMD subtype modeled separately. The initial distribution of patients across VA levels followed the distribution observed in MARINA and ANCHOR (sham controlled phase III randomized multicentre clinical trials) at randomization. Transition probabilities were based on data from the same trials. Treatment with 0.5mg ranibizumab was assumed, with nine injections in year 1 and six injections in year 2. Treatment duration was assumed to be one year for PC and two years for MC and OC lesions. Five clinicians completed a resource use questionnaire from which therapy and adverse event costs were estimated (2007 CDN$). Quality-of-life estimates were obtained from a time trade-off study carried out in a sample of the UK general population. Outcomes were measured in terms of quality-adjusted-life-years (QALY) and discounted (along with costs) at 5% annually. One-way and probabilistic sensitivity analyses were performed to estimate uncertainty around incremental cost-effectiveness ratios (ICER). Results: Ranibizumab demonstrated cost-effectiveness relative to PDT-V and BSC in all lesion types assuming a $50,000 threshold. The ICER for PC lesions was $4,167/QALY and $21,857/QALY relative to PDT-V and BSC respectively. For MC and OC lesions the ICER was $37,363/QALY and $38,151/QALY respectively relative to BSC. Conclusion: Ranibizumab offers good value for money compared to current standard treatments for all wet AMD lesion types.

Conference/Value in Health Info

2008-05, ISPOR 2008, Toronto, Ontario, Canada

Value in Health, Vol. 11, No. 3 (May/June 2008)

Code

PSS7

Topic

Economic Evaluation

Topic Subcategory

Cost-comparison, Effectiveness, Utility, Benefit Analysis

Disease

Sensory System Disorders

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