Osimertinib in Patients with T790M-Positive Advanced Non-small Cell Lung Cancer: Korean Subgroup Analysis from Phase II Studies

Cancer Res Treat. 2020 Jan;52(1):284-291. doi: 10.4143/crt.2019.200. Epub 2019 Jul 23.


Purpose: Osimertinib is a third-generation, irreversible, oral epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor (TKI) that potently and selectively inhibits both EGFR sensitizing mutation and EGFR T790M and has demonstrated efficacy in non-small cell lung cancer (NSCLC) central nervous system (CNS) metastases. We present results of a subgroup analysis of Korean patients from the pooled data of two global phase II trials: AURA extension (NCT01802632) and AURA2 (NCT02094261).

Materials and methods: Enrolled patients had EGFR T790M-positive NSCLC and disease progression during or after EGFR-TKI therapy. Patients received osimertinib 80 mg orally once daily until disease progression. The primary endpoint was objective response rate (ORR).

Results: In total, 66 Korean patients received osimertinib treatment with a median treatment duration of 19 months. In the evaluable-for-response population (n=62), ORR was 74% (95% confidence interval [CI], 61.5 to 84.5) and median duration of response was 9.8 months (95% CI, 7.1 to 16.8). In the full analysis set (n=66), median progression-free survival was 10.9 months (95% CI, 8.3 to 15.0; data cutoff November 1, 2016), and median overall survival was 29.2 months (95% CI, 24.8 to 35.7; data cutoff May 1, 2018). Eight patients with CNS metastases were evaluable for response, none of whom showed CNS progression. The most common adverse events were rash (53%), cough (33%), paronychia, diarrhea, and decreased appetite (each 32%).

Conclusion: Efficacy and safety profiles of osimertinib in this subgroup are consistent with the global phase II pooled population, which supports osimertinib as a recommended treatment for Korean patients with T790M positive NSCLC.

Keywords: Clinical trial; Epidermal growth factor receptor; Non-small-cell lung carcinoma; Phase II; South Korea; Tyrosine kinase inhibitor.

Publication types

  • Clinical Trial, Phase II

MeSH terms

  • Acrylamides / administration & dosage
  • Acrylamides / adverse effects
  • Acrylamides / therapeutic use*
  • Adult
  • Aged
  • Alleles
  • Amino Acid Substitution
  • Aniline Compounds / administration & dosage
  • Aniline Compounds / adverse effects
  • Aniline Compounds / therapeutic use*
  • Antineoplastic Agents / administration & dosage
  • Antineoplastic Agents / adverse effects
  • Antineoplastic Agents / therapeutic use
  • Carcinoma, Non-Small-Cell Lung / diagnosis
  • Carcinoma, Non-Small-Cell Lung / drug therapy*
  • Carcinoma, Non-Small-Cell Lung / genetics*
  • Carcinoma, Non-Small-Cell Lung / mortality
  • ErbB Receptors / genetics
  • Female
  • Humans
  • Kaplan-Meier Estimate
  • Lung Neoplasms / diagnosis
  • Lung Neoplasms / drug therapy*
  • Lung Neoplasms / genetics*
  • Lung Neoplasms / mortality
  • Male
  • Middle Aged
  • Mutation*
  • Prognosis
  • Protein Kinase Inhibitors / administration & dosage
  • Protein Kinase Inhibitors / adverse effects
  • Protein Kinase Inhibitors / therapeutic use
  • Republic of Korea
  • Treatment Outcome


  • Acrylamides
  • Aniline Compounds
  • Antineoplastic Agents
  • Protein Kinase Inhibitors
  • osimertinib
  • EGFR protein, human
  • ErbB Receptors

Associated data

  • ClinicalTrials.gov/NCT01802632
  • ClinicalTrials.gov/NCT02094261

Grant support