Beyond Osimertinib: The Development of Third-Generation EGFR Tyrosine Kinase Inhibitors For Advanced EGFR+ NSCLC

Single-agent osimertinib is the standard of care for the first-line treatment of advancedEGFR+ NSCLC and remained the only marketed third-generation EGFR tyrosine kinase inhibitor (TKI) until March 2020 when almonertinib (HS-10296) was approved in the People's Republic of China for the treatment of advanced EGFR T790M+ NSCLC based on a phase 2 expansion study of a phase 1/2 trial. In this review, we profiled many of the third-generation EGFR TKIs in late-stage clinical development (e.g., almonertinib, lazertinib, alflutinib¹, rezivertinib, ASK120069, SH-1028, D-0316, and abivertinib) based on their interim results from phase 1 and phase 2 trials, and included the designs of the phase 3 trials and their chemical structures when publicly available. We also listed other third-generation EGFR TKIs in pipeline development based on the search of clinical trial registration websites. In addition, we summarized the results of clinical trials that previously reported third-generation EGFR TKIs (rociletinib, olmutinib, nazartinib, mavelertinib), including phase 3 results of rociletinib and naquotinib. We further profiled combination clinical trial design of the third-generation EGFR TKIs including FLAURA2 (NCT04035486), MARIPOSA (NCT04487080), ACROSS1 (NCT04500704), and ACROSS2 (NCT04500717) that if positive can potentially usher in the next standard of care for advanced EGFR+ NSCLC.