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Epidermal growth factor receptor double activating mutations involving both exons 19 and 21 exist in Chinese

G-C Zhang1, J-Y Lin, Z Wang

  • 1Cancer Center, Sun Yat-Sen University, and Lung Cancer Research Institute, Guangdong Provincial People's Hospital, Dong Chuan Road, Guangzhou 510080, People's Republic of China.

Clinical Oncology (Royal College of Radiologists (Great Britain))
|June 1, 2007
PubMed
Abstract

Insights

EGFR double mutations in Chinese NSCLC patients respond well to tyrosine kinase inhibitors (TKIs). This double mutation enhances sensitivity to TKIs compared to single mutations, offering new treatment insights.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Epidermal Growth Factor Receptor (EGFR) mutations are key drivers in non-small cell lung cancer (NSCLC).
  • The emergence of double EGFR mutations can alter sensitivity to tyrosine kinase inhibitors (TKIs).
  • Previous studies identified EGFR double mutations in Asian populations, but their TKI sensitivity was uncharacterized.

Purpose of the Study:

  • To determine the prevalence of EGFR double mutations in Chinese NSCLC patients.
  • To characterize the biological properties and TKI sensitivity of these double mutations.
  • To investigate the specific delE746-A750+L858R double mutation.

Main Methods:

  • Sequencing of EGFR exons 18, 19, and 21 in 145 NSCLC tumor samples.
  • Identification of delE746-A750+L858R double mutations in five patients.
  • Construction of expression vectors and in vitro transfection in 293T cells.
  • Assessment of TKI sensitivity using immunoblotting.

Main Results:

  • The frequency of EGFR double mutations was 3.4% (5/145) in Chinese NSCLC patients.
  • All identified double mutations (delE746-A750+L858R) were on the same EGFR allele.
  • Patients with double mutations showed positive responses to gefitinib treatment.
  • The double mutant EGFR demonstrated enhanced sensitivity to TKIs at lower concentrations (0.1 microM) compared to single mutants.

Conclusions:

  • The delE746-A750+L858R double EGFR mutation is present in Chinese NSCLC patients.
  • This specific double mutation confers enhanced sensitivity to TKIs.
  • Further research is needed to understand downstream signaling alterations in double mutants.

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