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Updated: Jul 18, 2025

Establishment and Characterization of Three Afatinib-resistant Lung Adenocarcinoma PC-9 Cell Lines Developed with Increasing Doses of Afatinib
Published on: June 26, 2019
Taking early preventive interventions to manage the challenging issue of acquired resistance to third-generation EGFR
1Department of Hematology and Medical Oncology, Emory University School of Medicine and Winship Cancer Institute of Emory University, Atlanta, GA 30322, USA.
Abstract:
Although the clinical efficacies of third-generation epidermal growth factor receptor (EGFR)-tyrosine kinase inhibitors (TKIs) such as osimertinib in the treatment of non-small cell lung cancer (NSCLC) with EGFR-activating mutations are promising, drug-acquired resistance inevitably occurs whether they are used as first-line or second-line treatment. Therefore, managing the acquired resistance to third-generation EGFR-TKIs is crucial in the clinic for improving patient survival. Great efforts have been made to develop potentially effective strategies or regimens for the treatment of EGFR-mutant NSCLC patients after relapse following these TKIs therapies with the hope that patients will continue to benefit from treatment through overcoming acquired resistance. Although this approach, which aims to overcome drug-acquired resistance, is necessary and important, it is a passive practice. Taking preventive action early before disease progression to manage the unavoidable development of acquired resistance offers an equally important and efficient approach. We strongly believe that early preventive interventions using effective and tolerable combination regimens that interfere with the process of developing acquired resistance may substantially improve the outcomes of EGFR-mutant NSCLC treatment with third-generation EGFR-TKIs. Thus, this review focuses on discussing the scientific rationale and mechanism-driven strategies for delaying and even preventing the emergence of acquired resistance to third-generation EGFR-TKIs, particularly osimertinib.
Insights
Preventing acquired resistance to third-generation epidermal growth factor receptor (EGFR)-tyrosine kinase inhibitors (TKIs) is crucial for non-small cell lung cancer (NSCLC) patients. Early preventive strategies may improve outcomes for EGFR-mutant NSCLC treated with these TKIs.
Area of Science:
- Oncology
- Pharmacology
- Molecular Biology
Background:
- Third-generation epidermal growth factor receptor (EGFR)-tyrosine kinase inhibitors (TKIs), like osimertinib, show promise for non-small cell lung cancer (NSCLC) with EGFR-activating mutations.
- Acquired drug resistance to these TKIs is an inevitable challenge in both first-line and second-line treatment settings.
- Managing acquired resistance is critical for enhancing patient survival in EGFR-mutant NSCLC.
Purpose of the Study:
- To explore strategies for managing acquired resistance to third-generation EGFR-TKIs in EGFR-mutant NSCLC.
- To emphasize the importance of proactive, preventive interventions over passive resistance management.
- To discuss the scientific rationale and mechanism-driven approaches for delaying or preventing acquired resistance to third-generation EGFR-TKIs, particularly osimertinib.
Main Methods:
- Review of existing literature on EGFR-TKI resistance mechanisms.
- Analysis of clinical data regarding treatment outcomes for EGFR-mutant NSCLC.
- Exploration of combination regimens and preventive strategies.
Main Results:
- Current approaches to overcome acquired resistance are often passive and reactive.
- Early preventive interventions using tolerable combination regimens hold significant potential.
- Delaying or preventing resistance can substantially improve treatment outcomes for EGFR-mutant NSCLC.
Conclusions:
- Proactive strategies are essential to combat acquired resistance to third-generation EGFR-TKIs.
- Developing and implementing preventive measures can enhance the long-term efficacy of these targeted therapies.
- Further research into mechanism-driven preventive interventions is warranted to improve patient survival in EGFR-mutant NSCLC.
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