Cost-utility of different treatment strategies after the failure of tumour necrosis factor inhibitor in rheumatoid arthritis in the Finnish setting

Abstract

Objective. To evaluate the cost–utility of different treatment strategies in severe RA after TNF-inhibitor failure. Methods. The cost-effectiveness of treatment strategies was compared in a group of hypothetical Finnish RA patients. Initially, the patients received either best supportive care (BSC) or one of the following treatments before BSC: adalimumab (ADAL), abatacept (ABAT), etanercept (ETAN), infliximab (INFL) or rituximab (RTX). Further treatments were added to the most cost-effective strategy in a stepwise manner. The analysis was performed on an Excel-based Markov state transition model using the probabilistic approach. The clinical outcomes related to treatments were estimated from published clinical trials. The gained quality-adjusted life-years (QALYs) were estimated based on Health Utilities Index (HUI-3) and disease severity scores (HAQ). The resource use and costs were obtained from the Finnish treatment practice, one published study, the Finnish Unit Cost list and Finnish Medicine Tariffs. Results. Treatment with RTX was more effective and less costly than treatment with ADAL, ABAT or ETAN after TNF-inhibitor failure. An additional QALY gained with RTX costs 30 248 euros compared with BSC. The incremental cost-effectiveness ratios (ICERs) are 50 941, 50 372, 36 121 and 67 003 euros per QALY gained for adding ADAL, ETAN, INFL and ABAT to the RTX strategy, respectively. According to the cost-effectiveness acceptability frontier (CEAF), only BSC or treatments with RTX or RTX followed by INFL should be considered after TNF-inhibitor failure, if willingness to pay is between 0 and 50 000 euros per QALY gained. Conclusions. Treatment with RTX is a cost-effective treatment strategy in RA patients in Finland.