Fig. 1From: A real-world cohort study of first-line afatinib in patients with EGFR-mutant advanced non-small cell lung cancer in VietnamKaplan–Meier curve of the TTF of the study population (A), the TTF stratified by EGFR mutations (B) and the TTF stratified by brain metastasis at baseline. Abbreviations: TTF: time-to-failure treatment, EGFR: Epidermal Growth Factor ReceptorBack to article page