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Epidermal growth factor receptor and KRAS mutations in Brazilian lung cancer patients

Carlos E Bacchi1, Heloísa Ciol, Eduardo M Queiroga

  • 1Consultoria em Patologia, Botucatu, SP, Brazil. bacchi@conspat.com.br

Clinics (Sao Paulo, Brazil)
|June 6, 2012
PubMed
Abstract

Insights

This study found epidermal growth factor receptor (EGFR) and KRAS mutations in 30.4% and 14.6% of Brazilian non-small cell lung cancer patients, respectively. EGFR mutations were linked to non-smokers and adenocarcinoma, while KRAS mutations were associated with smoking.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Epidermal growth factor receptor (EGFR) and KRAS mutations are key in non-small cell lung cancer (NSCLC) pathogenesis.
  • EGFR is a significant target for molecular therapies in NSCLC.

Purpose of the Study:

  • To determine the frequency of EGFR and KRAS mutations in Brazilian NSCLC patients.
  • To investigate associations between these mutations and clinicopathological features.

Main Methods:

  • Analysis of 207 Brazilian NSCLC patient specimens for EGFR and KRAS somatic mutations.
  • Examination of associations with age, gender, ethnicity, smoking habits, and histological subtype.

Main Results:

  • EGFR mutations detected in 30.4% (63/207) and KRAS mutations in 14.6% (30/207) of patients.
  • Most common EGFR mutations: exon 19 deletion (60.3%) and L858R (27%). KRAS mutations primarily in codon 12.
  • EGFR mutations associated with non-smokers and adenocarcinoma; KRAS mutations associated with smoking and higher in non-Asian patients.

Conclusions:

  • This study provides the first prevalence data for EGFR and KRAS mutations in a Brazilian NSCLC cohort.
  • Findings highlight distinct mutation profiles and associations within this population, informing targeted therapy strategies.

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