Abstract
The discovery of "driver" genomic alterations in patients with non-small cell lung cancer (NSCLC) has dramatically changed the field of thoracic oncology in recent years. The best understood of these molecular drivers are those involving the epidermal growth factor receptor (EGFR), which when aberrantly activated are integral to the development of a subset of NSCLC tumors. First-generation and second-generation tyrosine kinase inhibitors (TKIs) specific to the activated EGFR have shown significant efficacy and have brought about the era of targeted therapy for NSCLC. The most common resistance mechanism is a threonine-to-methionine substitution (T790M) in exon 20 of the EGFR gene. Although the previous standard of care in patients with EGFR-mutated NSCLC that progressed on initial TKI therapy was chemotherapy, third-generation EGFR TKIs have now been developed and have yielded promising results for this population of patients with NSCLC. This article reviews the emerging data regarding third-generation agents in the treatment of patients with advanced NSCLC.
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