Osimertinib making a breakthrough in lung cancer targeted therapy
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Updated: Mar 14, 2026

Establishment and Characterization of Three Afatinib-resistant Lung Adenocarcinoma PC-9 Cell Lines Developed with Increasing Doses of Afatinib
Published on: June 26, 2019
1Department of Oncology, Zhongda Hospital, Medical School, Southeast University, Nanjing, People's Republic of China.
Abstract:
Epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKIs) are the evidence-based first-line treatment for advanced non-small-cell lung cancer that harbors sensitizing EGFR mutations (EGFRm(+)) such as exon 19 deletions and L858R substitutions in exon 21. However, acquired resistance to EGFR TKIs is mostly driven by a second-site EGFR T790M mutation, which negates their inhibitory activity. Osimertinib (AZD9291, Tagrisso™), an oral, third-generation EGFR TKI, has been designed to target the EGFR T790M mutation, while sparing wild-type EGFR. In this up-to-date review, focus is not only on the structure, mechanisms, and pharmacokinetics of osimertinib but also on summarizing clinical trials and making recommendations of osimertinib for patients with non-small-cell lung cancer.
Insights
Osimertinib is a targeted therapy for non-small cell lung cancer with EGFR mutations. It effectively treats T790M resistance mutations, offering a new treatment option for patients.
Area of Science:
- Oncology
- Pharmacology
- Molecular Biology
Background:
- Epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKIs) are standard first-line treatment for advanced non-small-cell lung cancer (NSCLC) with sensitizing EGFR mutations.
- Acquired resistance to EGFR TKIs, often due to the EGFR T790M mutation, limits treatment efficacy.
Purpose of the Study:
- To review the structure, mechanisms, pharmacokinetics, and clinical trial data of osimertinib.
- To provide recommendations for osimertinib use in NSCLC patients.
Main Methods:
- Literature review of osimertinib's properties and clinical studies.
- Analysis of clinical trial outcomes and resistance mechanisms.
Main Results:
- Osimertinib is a third-generation EGFR TKI designed to target the T790M resistance mutation while sparing wild-type EGFR.
- Clinical trials demonstrate osimertinib's efficacy in patients with EGFRm(+) NSCLC who have developed T790M resistance.
Conclusions:
- Osimertinib represents a significant advancement in treating EGFR-mutated NSCLC, particularly in cases of acquired resistance.
- This review synthesizes current knowledge to guide clinical decision-making regarding osimertinib therapy.
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