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Treatment with EGFR-tyrosine kinase inhibitor (TKI) shows a durable response against NSCLC harboring EGFR mutation; however, treatment resistance occurs within 1-1.5 years following first-line EGFR-TKIs [first- and second-generation (G) TKIs]. When resistant NSCLC exhibits T790M mutations, osimertinib is the standard therapy. However, intratumoral heterogeneity and clonal evolution may occur in NSCLC. Afatinib may overcome tumor heterogeneity, leading to T790M colonal purity. We aimed to determine whether NSCLC treatment with afatinib followed by osimertinib (afatinib group) provides higher therapeutic efficacy than other 1st-G EFGR-TKIs followed by osimertinib (1st-G group).

Which Is Better EGFR-TKI Followed by Osimertinib: Afatinib or Gefitinib/Erlotinib?