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KRAS oncogene substitutions in Korean NSCLC patients: clinical implication and relationship with pAKT and RalGTPases

Eun Young Kim1, Arum Kim2, Se Kyu Kim1

  • 1Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea.

Lung Cancer (Amsterdam, Netherlands)
|May 28, 2014
PubMed
Abstract

Insights

This study investigated KRAS mutations in Korean non-small cell lung cancer (NSCLC) patients. KRAS mutation subtypes did not impact clinical outcomes or signaling mediator expression, differing from Western populations.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • KRAS mutations are common in non-small cell lung cancer (NSCLC).
  • Different KRAS mutations can lead to varied downstream signaling pathways.
  • Understanding KRAS mutation distribution and impact is crucial for targeted therapies.

Purpose of the Study:

  • To investigate the distribution and clinical impact of KRAS mutations in Korean NSCLC patients.
  • To analyze the association between KRAS mutation subtypes and downstream signaling mediators (RalA, RalB, pAKT-Ser473).
  • To compare findings with Western populations regarding KRAS mutation characteristics.

Main Methods:

  • Direct sequencing of KRAS codons 12 and 13 in 1420 Korean NSCLC patients.
  • Immunohistochemical evaluation of RalA, RalB, and pAKT-Ser473 expression in 30 KRAS-mutated tumors.
  • Statistical analyses including chi-squared test and multivariate analysis for clinical outcome and molecular marker association.

Main Results:

  • KRAS mutations were found in 5.8% of patients, with Gly12Asp being the most frequent subtype.
  • Transversion mutations were associated with male gender and smoking history.
  • No significant differences in overall survival, pAKT-Ser473, RalA, or RalB expression were observed among KRAS mutation subtypes.
  • Strong RalB expression was associated with advanced NSCLC stages.

Conclusions:

  • The frequency and distribution of KRAS mutation subtypes in Korean NSCLC patients differ from Western cohorts.
  • KRAS mutation subtypes do not appear to influence clinical outcomes or key signaling mediator expression in this population.
  • RalB expression may serve as a potential biomarker for advanced disease stages in NSCLC.
Keywords:
KRASNSCLCRalARalBRalGTPasespAKT

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