A 1-year per-patient cost of therapy administration analysis of mosunetuzumab and tisagenlecleucel in relapsed or refractory follicular lymphoma patients receiving two or more lines of systemic therapy.

Objective: A per-patient cost of therapy administration model was developed to estimate the cost of mosunetuzumab vs. tisagenlecleucel in patients with relapsing or refractory follicular lymphoma (R/R FL) receiving two or more lines of systemic therapy (3L+) from both the Italian hospital and societal perspectives. Methods: A per-patient total cost of therapy administration model was developed to compare the resource consumption of two treatments - mosunetuzumab and tisagenlecleucel. The model considered direct costs such as healthcare labor costs for drug preparation and administration, non-drug consumable costs, and drug purchase. Indirect costs such as patient and caregiver's loss of productivity, transportation, and relocation were also considered. The unit costs and resource use data were retrieved from literature and standard Italian tariffs. To appraise the impact of patients' residency on access-to-care and out-of-pocket expenses, three scenario analyses were conducted. Results: Over 1 year, mosunetuzumab costs approximately one-fourth of tisagenlecleucel per patient. The base-case scenario showed a hospital cost reduction of €158,870 per patient with mosunetuzumab, increasing to €161,974 when including societal costs. Scenario analyses for the societal perspective estimated cost differences of -€161,170, -€166,507, and -€166,811 for scenarios A, B, and C, respectively. Sensitivity analysis indicated that tisagenlecleucel's price had the greatest impact on cost differences, followed by mosunetuzumab's price. Conclusions: This analysis identifies mosunetuzumab as an accessible therapeutic option for 3L+ R/R FL patients in Italy. Future research should collect real-time data and evaluate long-term outcomes.