Comparing the effects of afatinib with gefitinib or Erlotinib in patients with advanced-stage lung adenocarcinoma harboring non-classical epidermal growth factor receptor mutations

Lung Cancer. 2017 Aug;110:56-62. doi: 10.1016/j.lungcan.2017.06.007. Epub 2017 Jun 13.

Abstract

Objective: Approximately 10%-15% patients with epidermal growth factor receptor (EGFR) mutations harbor non-classical mutations. However, the effects of EGFR-tyrosine kinases (TKIs), particularly second-generation EGFR-TKI (afatinib) compared to first-generation EGFR-TKIs (gefitinib/erlotinib), in patients with non-classical EGFR mutations remain unknown.

Methods: We conducted this retrospective study at the China Medical University Hospital (Taichung, Taiwan) from June 2011 to July 2016. Specimens from 1632 patients were tested for EGFR mutations. We surveyed the effectiveness of afatinib and gefitinib/erlotinib in stage IIIb-IV lung adenocarcinoma patients with non-classical EGFR mutations.

Results: Fifty-six patients with advanced-stage (stage IIIB-IV) lung adenocarcinoma with non-classical mutations and receiving EGFR-TKI treatment had completed follow-up and were further analyzed. Afatinib versus gefitinib/erlotinib showed that the objective response rates were 62.5% versus 50.0% (p=0.35). Median progression-free survival (PFS) of 11.0 versus 3.6 months (p=0.03), respectively, was observed for the 51 non-classical EGFR mutated (excluding 5 patients with exon 20 insertions) lung adenocarcinomas. Subset analysis showed that PFS curves of afatinib were more easily distinguished in non-classical EGFR mutations lacking a combination with a classical mutation (non-classical with classical complex mutations group: median PFS, 11.0 versus 8.2 months, p=0.19; non-classical mutation alone or in combination with other non-classical mutations group: median PFS, 18.3 versus 2.8 months, p=0.07).

Conclusions: Afatinib may be a first-choice EGFR-TKI for patients with advanced-stage lung adenocarcinomas harboring non-classical mutations.

Keywords: Afatinib; EGFR; Erlotinib; Gefitinib; Lung adenocarcinoma; Non-classical EGFR mutation.

Publication types

  • Comparative Study

MeSH terms

  • Adenocarcinoma / drug therapy*
  • Adenocarcinoma / genetics*
  • Adenocarcinoma / mortality
  • Adenocarcinoma / pathology
  • Adenocarcinoma of Lung
  • Afatinib
  • Aged
  • Aged, 80 and over
  • Antineoplastic Combined Chemotherapy Protocols / therapeutic use*
  • DNA Mutational Analysis
  • ErbB Receptors / genetics*
  • Erlotinib Hydrochloride / administration & dosage
  • Female
  • Gefitinib
  • Humans
  • Kaplan-Meier Estimate
  • Lung Neoplasms / drug therapy*
  • Lung Neoplasms / genetics*
  • Lung Neoplasms / mortality
  • Lung Neoplasms / pathology
  • Male
  • Middle Aged
  • Mutation*
  • Neoplasm Staging
  • Quinazolines / administration & dosage
  • Retrospective Studies
  • Treatment Outcome

Substances

  • Quinazolines
  • Afatinib
  • Erlotinib Hydrochloride
  • ErbB Receptors
  • Gefitinib