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Pembrolizumab, as monotherapy in first-line recurrent or metastatic (R/M) head and neck squamous cell carcinoma (HNSCC) with a combined positive score (CPS) ≥1 and in combination with platinum and 5-fluorouracil (5-FU) in the overall R/M HNSCC population, received US FDA approval based on the KEYNOTE-048 trial. Using public drug prices, from a US payer perspective, we evaluated the cost-effectiveness of each pembrolizumab regimen  vs.  cetuximab + platinum+5-FU (EXTREME regimen, trial comparator), cisplatin + docetaxel + cetuximab (TPEx regimen), cisplatin + paclitaxel, and platinum+5-FU. A three-state partitioned-survival model was used to project costs and outcomes over 20 years with 3% annual discounting. Progression-free and overall survival were modeled using long-term extrapolation of KEYNOTE-048 data and, for alternative comparators, data from a network meta-analysis was used. Time-on-treatment was derived from KEYNOTE-048 or approximated using network meta-analysis progression-free survival estimates. Costs included first-line and subsequent treatments, disease management, adverse events, and terminal care costs. Utilities were derived from the KEYNOTE-048 Euro-QoL five-dimension data and using a US algorithm. In the CPS ≥1 R/M HNSCC population, pembrolizumab monotherapy was dominant  vs.  EXTREME and TPEx regimens, and cost-effective (at $100,000/QALY threshold)  vs.  platinum+5-FU ($86,827/QALY) and cisplatin + paclitaxel ($81,473/QALY). Pembrolizumab combination therapy in the overall R/M HNSCC population was dominant  vs.  TPEx regimen, and cost-effective  vs.  EXTREME regimen ($1769/QALY), platinum+5-FU ($81,989/QALY), and cisplatin + paclitaxel ($89,505/QALY). Sensitivity analyses showed a high cost-effectiveness probability for pembrolizumab at the $100,000/QALY threshold. First-line pembrolizumab monotherapy in patients with CPS ≥1, and pembrolizumab combination therapy in the overall R/M HNSCC population is cost-effective from the perspective of the US payers.

Cost-effectiveness of pembrolizumab for the first-line treatment of recurrent or metastatic head and neck squamous cell carcinoma in the United States