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Importance The survival of patients with advanced non–small cell lung cancer (NSCLC) with epidermal growth factor receptor (EGFR) gene mutations has improved substantially in the last decade with the development of targeted tyrosine kinase inhibitors (TKIs). Osimertinib, a third-generation TKI that is approved by the US Food and Drug Administration for the treatment of patients who developEGFRT790M mutations, has recently shown improved clinical outcomes compared with gefitinib and erlotinib for treatment-naive patients. Objective The aim of this study was to assess the cost-effectiveness of osimertinib for the first-line treatment of patients withEGFR-mutated NSCLC. Design, Setting, and Participants For this cost-effectiveness analysis, we extracted individual patient data from the FLAURA randomized clinical trial and used findings of our earlier meta-analysis to develop a decision-analytic model and …