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Updated: Feb 14, 2026

Identification of EGFR and RAS Inhibitors using Caenorhabditis elegans
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Structural Studies of Fourth-Generation EGFR Inhibitors Reveal Insights into Selective T790M and C797S Targeting

Tahereh Damghani1, Shenghan Song2, Kaly S Lin1

  • 1Department of Chemistry, College of Arts and Sciences, The State University of New York at Buffalo, Buffalo, New York 14260, United States.

ACS Medicinal Chemistry Letters
|February 13, 2026
PubMed

Insights

Fourth-generation EGFR inhibitors, BI-8128 and BI-4732, show promise against non-small cell lung cancer with T790M and C797S mutations. BI-8128 exhibits enhanced binding to double mutations, addressing EGFR inhibitor drug resistance.

Area of Science:

  • Oncology
  • Molecular Biology
  • Drug Discovery

Background:

  • Drug resistance in non-small cell lung cancer (NSCLC) is a significant clinical challenge.
  • Epidermal growth factor receptor (EGFR) mutations, including T790M and C797S, drive tumor progression and treatment failure.
  • Targeting mutant EGFR remains a critical therapeutic strategy.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the efficacy of fourth-generation EGFR inhibitors against specific resistance mutations.
  • To determine the binding affinity and structural basis for inhibition of T790M and C797S mutations by BI-8128 and BI-4732.

Main Methods:

  • X-ray cocrystallography was employed to determine the structures of inhibitors bound to mutant EGFR.
  • Molecular dynamics and thermodynamic integration calculations were performed to assess binding.
  • Biochemical and cellular assays were utilized to validate findings.

Main Results:

  • BI-8128 demonstrated stronger binding to the EGFR T790M/C797S double mutation compared to individual mutations.
  • Structural analysis revealed key interactions contributing to inhibitor efficacy.
  • Computational and experimental data correlated well, supporting the observed binding characteristics.

Conclusions:

  • Fourth-generation EGFR inhibitors, exemplified by BI-8128, possess potent activity against complex resistance mutations in NSCLC.
  • The design of these inhibitors effectively addresses multiple oncogenic and drug-resistant EGFR variants.
  • These findings support the clinical development of novel EGFR inhibitors for overcoming treatment resistance.
Keywords:
EGFRcrystallographykinase inhibitorsmolecular dynamicsnon-small cell lung cancerstructural biologytargeted therapy

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