Trastuzumab in adjuvant breast cancer therapy. A model based cost-effectiveness analysis

Abstract

Trastuzumab has shown activity in early breast cancer patients that overexpress HER2. Significant resources have to be allocated to finance this therapy, underlining the need for cost-effectiveness analysis. A model was set up, societal costs were calculated and the discount rate was 3%. Life expectancy data were based on the literature and prolonged according to qualified guess (10% and 20% absolute improvement in overall survival (OS)). The comparator was the FEC₁₀₀ regimen. The median additional health care cost per patient treated was €33 597. The yielding cost per life year gained (LYG) was €15 341 with a 20% improved OS and €35 947 with 10% improved OS. The corresponding net health care cost per quality adjusted life year (QALY) was €19 176 and €44 934. Including all resource use the figures were €8148 and €30 290 per LYG. Sensitivity analyses documented survival gain, price of trastuzumab, production gain and discount rate to be the major factors influencing cost-effectiveness ratio. Trastuzumab is indicated cost effective in Norway.