EGFR intron 1 polymorphism in Asian populations and its correlation with EGFR gene expression and amplification in breast tumor tissues

Qingyu Zhou, Bun Cheung Yin, Srinivasa Rao Jada, Teck Lim Wan, Wen Lin Kuo, Joe Gray, Ann S G Lee, Balram Chowbay

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Aim: The purpose of this study was to test the hypothesis if longer CA dinucleotide repeats are more common in the Asian population and also to gain insights into the interplay between the CA dinucleotide repeats and the frequencies of EGFR gene expression and amplifications as this might have therapeutic implications with regards to treatment with tyrosine kinase inhibitors. Materials and Methods: The EGFR intron 1 polymorphism was analysed in three distinct healthy Asian subjects, namely, Chinese (N = 96), Malays (N = 98) and Indians (N = 100). Comparative genomic hybridisation was performed to investigate for changes in DNA copy number in relation to the polymorphic CA dinucleotide repeats in breast tumor tissues (N = 22). Results: The frequency of short alleles with 14 and 15 CA repeats were most common in the Asian populations and significantly higher than those reported for Caucasians. The frequency of 20 CA repeats was 5%, almost 13-fold lower than previous reports. EGFR amplifications were detected in 23% and 11% of breast tumor tissues harboring short and long CA repeats, respectively. Conclusion: Our results show that the frequency of alleles encoding for short CA dinucleotide repeats is common in Asian populations. EGFR expression and amplification levels were also higher in Asian breast tumor tissues with short CA dinucleotide repeats. These findings suggest that the EGFR intron 1 polymorphism may influence response to treatment with tyrosine kinase inhibitors in breast cancer patients and further studies are warranted.

Original languageEnglish (US)
Pages (from-to)1445-1449
Number of pages5
JournalCancer Biology and Therapy
Volume5
Issue number11
StatePublished - Nov 2006
Externally publishedYes

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Dinucleotide Repeats
erbB-1 Genes
Gene Amplification
Introns
Breast Neoplasms
Gene Expression
Population
Gene Frequency
Protein-Tyrosine Kinases
DNA Copy Number Variations
Comparative Genomic Hybridization
Healthy Volunteers
Therapeutics

Keywords

  • Asian population
  • Breast cancer
  • CA dinucleotide repeats
  • EGFR
  • Polymorphism
  • RT-PCR

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

EGFR intron 1 polymorphism in Asian populations and its correlation with EGFR gene expression and amplification in breast tumor tissues. / Zhou, Qingyu; Yin, Bun Cheung; Jada, Srinivasa Rao; Wan, Teck Lim; Kuo, Wen Lin; Gray, Joe; Lee, Ann S G; Chowbay, Balram.

In: Cancer Biology and Therapy, Vol. 5, No. 11, 11.2006, p. 1445-1449.

Research output: Contribution to journalArticle

Zhou, Qingyu ; Yin, Bun Cheung ; Jada, Srinivasa Rao ; Wan, Teck Lim ; Kuo, Wen Lin ; Gray, Joe ; Lee, Ann S G ; Chowbay, Balram. / EGFR intron 1 polymorphism in Asian populations and its correlation with EGFR gene expression and amplification in breast tumor tissues. In: Cancer Biology and Therapy. 2006 ; Vol. 5, No. 11. pp. 1445-1449.
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AU - Jada, Srinivasa Rao

AU - Wan, Teck Lim

AU - Kuo, Wen Lin

AU - Gray, Joe

AU - Lee, Ann S G

AU - Chowbay, Balram

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