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Overall survival of non-small cell lung cancer patients according to timing of brain metastases. Overall survival from the time of diagnosis of brain metastases (BM-OS) by epidermal growth factor receptor (EGFR) mutational status among patients with synchronous (A) or metachronous (B) development of brain metastases. EGFR mutant type (MT, dashed line) vs. EGFR (WT, solid line).
