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Identification of EGFR and RAS Inhibitors using Caenorhabditis elegans
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EGFR-TKIs resistance via EGFR-independent signaling pathways

Qian Liu1, Shengnan Yu1, Weiheng Zhao1

  • 1Department of Oncology, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.

Molecular Cancer
|February 20, 2018
PubMed

Insights

Tyrosine kinase inhibitors (TKIs) benefit EGFR-mutated lung cancer patients but acquired resistance develops. Understanding resistance mechanisms like EGFR mutations and bypass signaling is key to developing new combination therapies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Tyrosine kinase inhibitors (TKIs) are effective for EGFR-mutated cancers, particularly lung cancer.
  • Acquired resistance limits the long-term efficacy of TKI treatments in most patients.
  • Resistance mechanisms include secondary EGFR mutations and activation of bypass signaling pathways.

Purpose of the Study:

  • To review the mechanisms of acquired resistance to EGFR-TKIs.
  • To discuss strategies for overcoming TKI resistance in cancer treatment.
  • To highlight the potential of combination therapies for improved clinical outcomes.

Main Methods:

  • Literature review of studies on TKI resistance in EGFR-mutated cancers.
  • Analysis of molecular mechanisms underlying acquired resistance.
  • Evaluation of ongoing and completed clinical trials for resistance-targeting agents.

Main Results:

  • Acquired resistance involves EGFR-dependent mechanisms (e.g., T790M mutation) and EGFR-independent mechanisms (e.g., RTK dysregulation, PI3K/Akt and MAPK pathway activation).
  • These mechanisms confer compensatory signaling, overriding EGFR inhibition.
  • Numerous clinical trials are investigating strategies to prevent or overcome TKI resistance.

Conclusions:

  • Combination therapies involving EGFR-TKIs and agents targeting resistance mechanisms offer a promising strategy.
  • This approach holds potential as a first-line treatment to improve patient outcomes in EGFR-mutated cancers.
  • Further research and clinical trials are essential to optimize these combination strategies.
Keywords:
Bypass signalingsDownstream compoundsDrug resistanceEGFRErbBRTKsTKIs

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