Osimertinib for Patients With Leptomeningeal Metastases Associated With EGFR T790M-Positive Advanced NSCLC: The AURA Leptomeningeal Metastases Analysis

Myung Ju Ahn, Chao Hua Chiu, Ying Cheng, Ji Youn Han, Sarah B. Goldberg, Alastair Greystoke, Jeffrey Crawford, Yanqiu Zhao, Xiangning Huang, Martin Johnson, Karthick Vishwanathan, James W.T. Yates, Andrew P. Brown, Ariadna Mendoza-Naranjo, Tony Mok

Research output: Contribution to journalArticlepeer-review

134 Citations (Scopus)

Abstract

Introduction: Osimertinib has shown promising activity in patients with leptomeningeal metastases (LMs) of EGFR-positive NSCLC at 160 mg once daily (qd) (BLOOM; NCT02228369). We report LM activity with osimertinib (80 mg qd) in a retrospective analysis of studies across the AURA program (AURA extension, AURA2, AURA17, and AURA3). Methods: Patients with EGFR T790M-positive advanced NSCLC and progression after previous EGFR-tyrosine kinase inhibitor therapy received osimertinib (80 mg qd). Patients with central nervous system (CNS) metastases (including LMs) were eligible if the lesions were neurologically asymptomatic and stable. Patients with evidence of LMs at the study entry were retrospectively included for the analysis; brain scans were assessed for radiologic LM response by neuroradiologically blinded, independent central review per the modified Response Assessment in Neuro-Oncology LM criteria. LM objective response rate, duration of response, progression-free survival, and overall survival were assessed. A longitudinal analysis was performed to investigate the relationship between changes from the baseline in non-CNS tumor sizes and LM responses at each visit of patients in AURA LM and BLOOM studies. Results: For the 22 patients included in the analysis, LM objective response rate was 55% (95% confidence interval [CI]: 32–76). Median LM duration of response was not reached (95% CI: 2.8–not calculable [NC]). Median LM progression-free survival and overall survival were 11.1 months (95% CI: 4.6–NC) and 18.8 months (95% CI: 6.3–NC), respectively. The longitudinal analysis revealed similar non-CNS and LM responses between the patients in AURA LM and BLOOM programs. Conclusions: Patients with EGFR T790M-positive NSCLC and radiologically detected LM obtained clinical benefit from osimertinib (80 mg qd).

Original languageEnglish
Pages (from-to)637-648
Number of pages12
JournalJournal of Thoracic Oncology
Volume15
Issue number4
DOIs
Publication statusPublished - Apr 2020
Externally publishedYes

Keywords

  • EGFR mutation
  • Leptomeningeal metastases
  • NSCLC
  • Osimertinib
  • T790M

ASJC Scopus subject areas

  • Oncology
  • Pulmonary and Respiratory Medicine

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