JOURNAL ARTICLE
REVIEW
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Can we define the optimal sequence of epidermal growth factor receptor tyrosine kinase inhibitors for the treatment of epidermal growth factor receptor-mutant nonsmall cell lung cancer?

PURPOSE OF REVIEW: The most common mechanism of resistance to epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKIs) is acquisition of the T790M gatekeeper mutation. Third-generation EGFR TKIs irreversibly inhibit EGFR mutants (EGFRm), especially T790M, while sparing wild-type EGFR. There are several third-generation EGFR TKIs under development, including osimertinib, CO-1686 (rociletinib), HM61713 (olmutinib), ASP8273, and EGF816. These third-generation EGFR TKIs have shown promising efficacy with favorable toxicity profiles in the management of advanced nonsmall cell lung cancer (NSCLC) with an acquired T790M mutation (EGFR). In the present review, we will discuss the evolving treatment landscape of EGFRm NSCLC.

RECENT FINDINGS: The LUX-Lung 7 study demonstrated superior progression-free survival, time-to-treatment failure, and objective response rate with afatinib versus gefitinib, but no significant overall survival improvement in TKI-naïve EGFRm NSCLC patients. In EGFRm NSCLC patients harboring T790M after treatment with first-generation or second-generation EGFR TKIs, third-generation EGFR TKIs showed robust efficacy with tolerable toxicity. The updated results of phase I studies have demonstrated encouraging activity of first-line osimertinib in patients with EGFRm NSCLC.

SUMMARY: Following progression with first-generation or second-generation EGFR TKIs, osimertinib was recently approved for the treatment of EGFR NSCLC. Encouraging early results with osimertinib have sparked interest in first-line treatment of EGFRm NSCLC, and head-to-head comparison studies of third-generation versus first-generation EGFR TKIs are being developed.

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