Background: The landscape of treatment strategies for relapsed/refractory multiple myeloma (RRMM) has dramatically changed due to the emergence of chimeric antigen receptor T (CAR-T) cell therapy. The aim of this study was to evaluate the cost-effectiveness of two CAR-T cell treatments for RRMM patients from the perspective of the Chinese healthcare system.
Methods: A Markov model was used to compare currently available salvage chemotherapy with Idecabtagene vicleucel (Ide-cel) and Ciltacabtagene autoleucel (Cilta-cel) for treatment of patients with RRMM. The model was developed based on data from three studies: CARTITUDE-1, KarMMa, and MAMMOTH. The healthcare cost and utility of RRMM patients were collected from a provincial clinical center in China.
Results: In the base case analysis, 3.4% and 36.6% of RRMM patients were expected to be long-term survivors after 5 years of Ide-cel and Cilta-cel treatment, respectively. Compared to salvage chemotherapy, Ide-cel and Cilta-cel were associated with incremental QALYs of 1.19 and 3.31, and incremental costs of US$140,693 and $119,806, leading to ICERs of $118,229 and $36,195 per QALY, respectively. At an ICER threshold of $37,653/QALY gained, the probability that Ide-cel and Cilta-cel are cost-effective were estimated to be 0% and 72%, respectively. With younger target people entering the model, and a partitioned survival model in scenario analysis, the ICERs of Cilta-cel and Ide-cel changed rather mildly and their cost-effectiveness results were the same as base analysis.
Conclusions: Based on the willingness-to-pay of 3-times China's per capita GDP in 2021, Cilta-cel was considered to be a more cost-effective option compared to salvage chemotherapy for RRMM in China, while Ide-cel was not.
Keywords: CAR-T therapy; D; D4; D40; Markov model; O; O5; O53; Relapsed/refractory multiple myeloma; cost effectiveness analysis; partitioned survival model.