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Early Clearance of Plasma Epidermal Growth Factor Receptor Mutations as a Predictor of Outcome on Osimertinib in Advanced Non-Small Cell Lung Cancer; Exploratory Analysis from AURA3 and FLAURA

  • Jhanelle E. Gray
  • , Myung Ju Ahn
  • , Geoffrey R. Oxnard
  • , Frances A. Shepherd
  • , Fumio Imamura
  • , Ying Cheng
  • , Isamu Okamoto
  • , Byoung Chul Cho
  • , Meng Chih Lin
  • , Yi Long Wu
  • , Margarita Majem
  • , Oliver Gautschi
  • , Michael Boyer
  • , Krishna C. Bulusu
  • , Aleksandra Markovets
  • , J. Carl Barrett
  • , Rachel Hodge
  • , Astrid McKeown
  • , Ryan J. Hartmaier
  • , Juliann Chmielecki
  • Vassiliki A. Papadimitrakopoulou, Suresh S. Ramalingam*
*Corresponding author for this work
  • University of South Florida
  • Sungkyunkwan University
  • Dana-Farber Cancer Institute
  • University Health Network
  • Osaka International Cancer Institute
  • Jilin Provincial Cancer Hospital
  • Kyushu University
  • Yonsei University
  • Chang Gung University
  • Guangdong Academy of Medical Sciences
  • Hosp Santa Creu & Sant Pau
  • University of Bern
  • Chris O'Brien Lifehouse
  • AstraZeneca
  • University of Texas Health Science Center at Houston
  • Emory University

Research output: Contribution to journalJournal Article peer-review

57 Scopus citations

Abstract

PURPOSE: Plasma circulating tumor DNA (ctDNA) analysis is used for genotyping advanced non-small cell lung cancer (NSCLC); monitoring dynamic ctDNA changes may be used to predict outcomes.

PATIENTS AND METHODS: This was a retrospective, exploratory analysis of two phase III trials [AURA3 (NCT02151981), FLAURA (NCT02296125)]. All patients had EGFR mutation-positive (EGFRm; ex19del or L858R) advanced NSCLC; AURA3 also included T790M-positive NSCLC. Osimertinib (FLAURA, AURA3), or comparator EGFR-tyrosine kinase inhibitor (EGFR-TKI; gefitinib/erlotinib; FLAURA), or platinum-based doublet chemotherapy (AURA3) was given. Plasma EGFRm was analyzed at baseline and Weeks 3/6 by droplet digital PCR. Outcomes were assessed by detectable/non-detectable baseline plasma EGFRm and plasma EGFRm clearance (non-detection) at Weeks 3/6.

RESULTS: In AURA3 (n = 291), non-detectable versus detectable baseline plasma EGFRm had longer median progression-free survival [mPFS; HR, 0.48; 95% confidence interval (CI), 0.33-0.68; P < 0.0001]. In patients with Week 3 clearance versus non-clearance (n = 184), respectively, mPFS (months; 95% CI) was 10.9 (8.3-12.6) versus 5.7 (4.1-9.7) with osimertinib and 6.2 (4.0-9.7) versus 4.2 (4.0-5.1) with platinum-pemetrexed. In FLAURA (n = 499), mPFS was longer with non-detectable versus detectable baseline plasma EGFRm (HR, 0.54; 95% CI, 0.41-0.70; P < 0.0001). For Week 3 clearance versus non-clearance (n = 334), respectively, mPFS was 19.8 (15.1 to not calculable) versus 11.3 (9.5-16.5) with osimertinib and 10.8 (9.7-11.1) versus 7.0 (5.6-8.3) with comparator EGFR-TKI. Similar outcomes were observed by Week 6 clearance/non-clearance.

CONCLUSIONS: Plasma EGFRm analysis as early as 3 weeks on-treatment has the potential to predict outcomes in EGFRm advanced NSCLC.

Original languageEnglish
Pages (from-to)3340-3351
Number of pages12
JournalClinical Cancer Research
Volume29
Issue number17
DOIs
StatePublished - 01 09 2023
Externally publishedYes

Bibliographical note

©2023 American Association for Cancer Research.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

  1. SDG 3 - Good Health and Well-being
    SDG 3 Good Health and Well-being

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