A Phase 1/2 Study of Lazertinib 240 mg in Patients With Advanced EGFR T790M-Positive NSCLC After Previous EGFR Tyrosine Kinase Inhibitors

J Thorac Oncol. 2022 Apr;17(4):558-567. doi: 10.1016/j.jtho.2021.11.025. Epub 2021 Dec 24.

Abstract

Introduction: This integrated analysis of a phase 1/2 study (NCT03046992) evaluated the efficacy and safety of lazertinib, a third-generation EGFR tyrosine kinase inhibitor (TKI), in patients with advanced EGFR T790M-positive NSCLC after previous EGFR TKI therapy.

Methods: Adults with EGFR mutation-positive NSCLC that progressed after prior EGFR-directed TKIs received once daily oral lazertinib 240 mg continuously until disease progression. Prior TKIs to treat T790M-positive NSCLC were prohibited. Primary endpoints were safety and objective response rate (ORR). Secondary endpoints included progression-free survival, overall survival, and intracranial ORR.

Results: A total of 78 patients received lazertinib 240 mg at 17 centers in South Korea. Among patients with T790M-positive tumors at baseline (N = 76), one (1.3%) had a complete response and 41 (53.9%) had partial responses, giving an ORR of 55.3% (95% confidence interval [CI]: 44.1-66.4). Median progression-free survival was 11.1 months (95% CI: 5.5-16.4). Median overall survival was not reached (median follow-up = 22.0 mo). In patients with measurable intracranial lesions (n = 7), one (14.3%) had a complete intracranial response and five (71.4%) had partial responses, giving an intracranial ORR of 85.7% (95% CI: 59.8%-100.0%). The most common treatment-emergent adverse events were rash (37.2%), pruritus (34.6%), and paresthesia (33.3%); most were mild to moderate in severity. Serious drug-related adverse events occurred in three patients (gastritis, pneumonia, pneumonitis). The major mechanism of resistance was EGFR T790M loss.

Conclusions: Lazertinib 240 mg/d has a manageable safety profile with durable antitumor efficacy, including brain metastases, in patients with advanced T790M-positive NSCLC after previous EGFR TKI therapy.

Keywords: EGFR T790M-positive non-small cell lung cancer (NSCLC); Epidermal growth factor receptor (EGFR); Lazertinib; Tyrosine kinase inhibitor (TKI).

Publication types

  • Clinical Trial, Phase I
  • Clinical Trial, Phase II
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Carcinoma, Non-Small-Cell Lung* / chemically induced
  • Carcinoma, Non-Small-Cell Lung* / drug therapy
  • Carcinoma, Non-Small-Cell Lung* / genetics
  • ErbB Receptors / genetics
  • Humans
  • Lung Neoplasms* / chemically induced
  • Lung Neoplasms* / drug therapy
  • Lung Neoplasms* / genetics
  • Morpholines
  • Mutation
  • Protein Kinase Inhibitors / pharmacology
  • Protein Kinase Inhibitors / therapeutic use
  • Pyrazoles
  • Pyrimidines

Substances

  • Morpholines
  • Protein Kinase Inhibitors
  • Pyrazoles
  • Pyrimidines
  • lazertinib
  • EGFR protein, human
  • ErbB Receptors

Associated data

  • ClinicalTrials.gov/NCT03046992