Cost-effectiveness of Pembrolizumab for Patients with Advanced, Unresectable, or Metastatic Urothelial Cancer Ineligible for Cisplatin-based Therapy

Background: There is an unmet need for effective therapies for patients with advanced or metastatic urothelial cancer who cannot tolerate cisplatin-based chemotherapy. Cisplatinineligible patients experience a high frequency of adverse events from the most commonly used standard of care treatment, carboplatin plus gemcitabine, or alternative treatment with gemcitabine monotherapy. Pembrolizumab is a potent, highly selective humanised monoclonal antibody that releases checkpoint inhibition of the immune response system, and provides a new alternative for these patients. Objective: To assess the cost-effectiveness of pembrolizumab for first-line treatment of urothelial carcinoma ineligible for cisplatin-based therapy in patients with strongly PD-L1– positive tumours in Sweden. Design, setting, and participants: Parametric survival curves were fitted to overall survival, progression-free survival, and time on treatment data from KEYNOTE-052 to extrapolate clinical outcomes. A simulated treatment comparison and a network meta-analysis were conducted to estimate the comparative efficacy of pembrolizumab versus carboplatin plus gemcitabine and gemcitabine monotherapy. EQ-5D data from KEYNOTE-052 were used to estimate utility, while resource use and cost inputs were estimated using Swedish regional pricing lists and clinician opinion. Outcome measurements and statistical analysis: The model reported costs, life years, and quality-adjusted life years (QALYs), and results were tested using deterministic and probabilistic sensitivity analysis. Results and limitations: We estimated that pembrolizumab would improve survival by 2.11 and 2.16 years and increase QALYs by 1.71 and 1.75 compared to carboplatin plus gemcitabine and gemcitabine monotherapy, respectively. Pembrolizumab was associated with a cost increase of s90 520 versus carboplatin plus gemcitabine and s95 055 versus gemcitabine, with corresponding incremental cost-effectiveness ratios of s53 055/QALY and s54 415/QALY. Conclusions: At a willingness-to-pay threshold of s100 000/QALY, pembrolizumab is a costeffective treatment versus carboplatin plus gemcitabine and versus gemcitabine. Patient summary: This is the first analysis to show that pembrolizumab is a cost-effective option for first-line treatment of cisplatin-ineligible patients with locally advanced or metastatic urothelial carcinoma in Sweden.

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