Abstract

The prognosis for patients with advanced epidermal growth factor receptor (EGFR)-mutated non-small cell lung cancer (NSCLC) has significantly improved with the use of EGFR-tyrosine kinase inhibitors (EGFR-TKIs), such as the widely used first-generation EGFR-TKI, Erlotinib. The association between EGFR exon 19 deletions (ex19del) and prolonged survival in EGFR-TKI-treated patients has previously been widely reported, with median overall survival (OS) of approximately 31 months. Molecular factors indicating prolonged survival are not defined.

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