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Osimertinib (AZD9291) increases radio‑sensitivity in EGFR T790M non‑small cell lung cancer

Nannan Wang1, Linlin Wang2, Xiangjiao Meng2

  • 1Department of Oncology, School of Medicine and Life Sciences, University of Jinan‑Shandong Academy of Medical Sciences, Jinan, Shandong 250022, P.R. China.

Oncology Reports
|October 27, 2018
PubMed

Insights

Osimertinib enhances radiation therapy for EGFR T790M non-small cell lung cancer. This combination therapy inhibits cancer cell growth, DNA repair, and improves antitumor effects, showing promise for clinical use.

Area of Science:

  • Oncology
  • Molecular Biology
  • Radiotherapy

Background:

  • Osimertinib is a third-generation EGFR tyrosine kinase inhibitor effective for EGFR-mutated lung cancers.
  • The combination of osimertinib with ionizing radiation (IR) for EGFR T790M non-small cell lung cancer (NSCLC) lacks comprehensive understanding.

Purpose of the Study:

  • To investigate the therapeutic effects of combining osimertinib with IR in EGFR T790M NSCLC.
  • To evaluate the impact of this combination on cancer cell proliferation, DNA damage repair, and signaling pathways.

Main Methods:

  • In vitro studies using NCI-H1975 lung cancer cells (EGFR T790M positive).
  • In vivo studies using tumor-bearing nude mice models.
  • Assays included proliferation, clonogenic survival, cell cycle analysis, DNA damage assessment, and Western blotting for signaling proteins.

Main Results:

  • Osimertinib inhibited proliferation and clonogenic survival post-irradiation.
  • Osimertinib delayed DNA damage repair and reduced G2/M phase arrest in irradiated cells.
  • The combination therapy blocked EGFR and downstream signaling pathways (AKT, ERK) and enhanced antitumor activity in vivo.

Conclusions:

  • Osimertinib acts as a potent radiation-sensitizer in EGFR T790M mutated NSCLC.
  • This study provides a strong rationale for the clinical combination of osimertinib and IR in this patient population.

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