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Kaplan-Meier curve analyses of OS in all NSCLC patients with de novo brain metastases. Kaplan-Meier curve was stratified by EGFR mutation status (EGFR wild-type vs EGFR mutation) in A; EGFR mutation types (exon 21 L858R vs exon 19 deletion vs unknown mutation) in B. Abbreviations: OS, overall survival; NSCLC, non-small cell lung cancer; EGFR, epidermal growth factor receptor.
