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Kaplan–Meier plot of survival times stratified byepidermal growth factor receptor (EGFR) mutation status. (a) Overall survival of patients treated with gefitinib. (b) Progression‐free survival of patients treated gefitinib. MPFS, median progression‐free survival time; MST, median survival time; Mut, EGFR mutation; Wt, EGFR wild‐type. P‐values were calculated using the log‐rank test.
