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Background: This study evaluated the cost-effectiveness of avelumab first-line (1L) maintenance therapy plus best supportive care (BSC) versus BSC alone for adults with locally advanced or metastatic urothelial carcinoma (la/mUC) that had not progressed following platinum-based chemotherapy in France., Methods: A three-state partitioned survival model was developed to assess the lifetime costs and effects of avelumab plus BSC versus BSC alone. Data from the phase 3 JAVELIN Bladder 100 trial (NCT02603432) were used to inform estimates of clinical and utility values considering a 10-year time horizon and a weekly cycle length. Cost data were estimated from a collective perspective and included treatment acquisition, administration, follow-up, adverse event-related hospitalization, transport, post-progression, and end-of-life costs. Health outcomes were measured in quality-adjusted life-years (QALYs) and life-years gained. Costs and clinical outcomes were discounted at 2.5% per annum. Incremental cost-effectiveness ratios (ICERs) were used to compare cost-effectiveness and willingness to pay in France. Uncertainty was assessed using a range of sensitivity analyses., Results: Avelumab plus BSC was associated with a gain of 2.49 QALYs and total discounted costs of €136,917; BSC alone was associated with 1.82 QALYs and €39,751. Although avelumab plus BSC was associated with increased acquisition costs compared with BSC alone, offsets of -€20,424 and -€351 were observed for post-progression and end-of-life costs, respectively. The base case analysis ICER was €145,626/QALY. Sensitivity analyses were consistent with the reference case and showed that efficacy parameters (overall survival, time to treatment discontinuation), post-progression time on immunotherapy, and post-progression costs had the largest impact on the ICER., Conclusions: This analysis demonstrated that avelumab plus BSC is associated with a favorable cost-effectiveness profile for patients with la/mUC who are eligible for 1L maintenance therapy in France., Competing Interests: F. Porte is an employee of Merck Santé S.A.S., Lyon, France, an affiliate of Merck KGaA, Darmstadt, Germany at the time of the project. A. Granghaud was an employee of Pfizer S.A.S., Paris, France at the time of the study. J. Chang is an employee of Pfizer and holds stock and other ownership interest with Bayer, Bristol Myers Squibb, and Pfizer. M. Kearney is an employee of Merck KGaA, Darmstadt, Germany, and holds stock in Merck KGaA, Darmstadt, Germany, Novartis and UCB. A. Morel is an employee of Pfizer S.A.S., Paris, France. I. Plessala was an employee of Amaris Consulting, Paris, France at the time of the study. H. Cawston is an employee of Amaris Consulting, Paris, France. J. Roiz is an employee of and reposts stocks and other ownership interest with Evidera. Y. Xiao is an employee of Evidera. M.-N. Solbes is an employee of Merck Santé S.A.S., Lyon, France, an affiliate of Merck KGaA, Darmstadt, Germany. P. Lambert is an employee of Pfizer S.A.S., Paris, France. A. Ravaud has received grants or contracts from Merck KGaA, Darmstadt, Germany, and Pfizer; has received travel and accommodation expenses from Ipsen Merck KGaA, Darmstadt, Germany, Merck & Co., Kenilworth, NJ, and Pfizer; and has participated in advisory boards for Esai, Ipsen, Merck KGaA, Darmstadt, Germany, and Pfizer. Y. Loriot has served in consulting or advisory roles for Astellas Pharma, Bristol Myers Squibb, Immunomedics, Janssen, Loxo/Lilly, Merck KGaA, Darmstadt, Germany, Merck & Co., Kenilworth, NJ, Pfizer, Roche, Seattle Genetics, and Taiho Pharmaceutical; has received travel and accommodations expenses from Astellas Pharma, Janssen Oncology, Merck & Co., Kenilworth, NJ, Roche, and Seattle Genetics; and has received institutional research funding from Astellas Pharma, Basilea, Bristol Myers Squibb, Exelixis, Gilead Sciences, Incyte, Janssen Oncology, Merck KGaA, Darmstadt, Germany, Merck & Co., Kenilworth, NJ, Nektar, Pfizer, Roche, Sanofi, Seattle Genetics, and Taiho Pharmaceutical. A. Thiery-Vuillemin has participated in advisory boards for Astellas Pharma, AstraZeneca, Bristol-Myers Squibb, Ipsen, Janssen, Merck & Co., Kenilworth, NJ, Novartis, Pfizer, Roche/Genentech and Sanofi; reports employment by Bristol Myers Squibb; has served on steering committees for AstraZeneca, Bristol-Myers Squibb and Novartis; has received institutional research funding from Bayer, Ipsen and Pfizer; has served as principal investigator for Astellas Pharma, AstraZeneca, Bristol-Myers Squibb, Excelixis, Incyte, Ipsen, Johnson & Johnson, Merck & Co., Kenilworth, NJ, Novartis, Pfizer, Roche, Sanofi, and UNICANCER/GETUG; has received travel and accommodation expenses from Astellas Pharma, AstraZeneca, Bristol-Myers Squibb, Ipsen, Johnson & Johnson, Merck & Co., Kenilworth, NJ, Pfizer and Roche; and is a member of ASCO and GETUG. P. Lévy has served in consulting or advisory role and had received honoraria from Merck KGaA, Darmstadt, Germany. This does not alter our adherence to PLOS ONE policies on sharing data and materials, (Copyright: © 2024 Porte et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)