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This study evaluates the cost-effectiveness of daratumumab (D) in combination with lenalidomide and dexamethasone (Rd) for treatment of relapsed and/or refractory multiple myeloma in patients who have received at least one prior therapy in Singapore. A 3-state partitioned survival model was developed to evaluate the cost-effectiveness of lenalidomide and dexamethasone with or without daratumumab from a healthcare system perspective over 10 years. Clinical inputs were obtained from the POLLUX trial. Health state utilities were derived from the literature and direct medical costs obtained from public healthcare institutions. Sensitivity and scenario analyses were conducted to explore uncertainties. DRd was associated with a high base-case incremental cost-effectiveness ratio (ICER) of US$576,247 per quality-adjusted life year (QALY) gained, compared with Rd. According to one-way sensitivity analysis, ICER was most heavily influenced by time horizon, discount rate for outcomes, progression-free utility and cost of daratumumab. Regardless of the variation, DRd remained not cost-effective. Even when the cost of both daratumumab and lenalidomide dropped by 20% and 80%, the ICERs remained high at US$470,400 and US$152,860 per QALY gained. At current prices, the addition of daratumumab to lenalidomide and dexamethasone does not represent cost-effective use of healthcare resources in Singapore.

Cost-effectiveness of daratumumab in combination with lenalidomide and dexamethasone for relapsed and/or refractory multiple myeloma