CTLA-4 +49A>G polymorphism is associated with the risk but not with the progression of colorectal cancer in Chinese

  • Peng Qi
  • Can-ping Ruan
  • Hao Wang
  • Fei-guo Zhou
  • Xin-yun Xu
  • Xing Gu
  • Yun-peng Zhao
  • Tong-hai Dou
  • Chun-fang Gao
Original Article

Abstract

Purpose

Colorectal cancer (CRC) is one of the most common malignancies in the world and a multipathway disease. Cytotoxic T-lymphocyte antigen-4 (CTLA-4) is a potent immunoregulatory molecule that suppresses antitumor response by down-regulating T-cell activation. The most studied +49A>G polymorphism of CTLA-4 gene has been associated with several autoimmune or cancer diseases. Our aim was to investigate the association between this genetic variant and the risk as well as progression of colorectal cancer in Chinese.

Methods

We conducted a case–control study of 124 colorectal cancer cases and 407 healthy controls. DNA was extracted from blood specimens, and +49A>G polymorphism in the CTLA-4 gene was genotyped by polymerase chain reaction–ligation detection reaction (PCR–LDR).

Results

In our study group, the frequency of AG or GG or carrying at least one G allele at position +49 was significantly different in colorectal cancer patients and the control group, indicating that the risk of CRC was significantly higher among subjects with the AG or GG genotype or carrying at least one G allele at position +49 than among the subjects with the AA genotype. However, we observed no association between CTLA-4 +49A>G polymorphism and the progression of CRC. Interestingly, the CTLA-4 +49A allele was in non-significantly higher numbers in CRC patients with distant metastasis.

Conclusions

Our results suggested that CTLA-4 +49A>G polymorphism was associated with an increased risk of colorectal cancer, but this polymorphism did not play an important role in the progression of CRC in Chinese.

Keywords

Colorectal cancer Cytotoxic T-lymphocyte antigen-4 Single-nucleotide polymorphism Individual susceptibility Case–control study 

Notes

Acknowledgements

The research in the author's laboratory was supported by the National Natural Science Foundation of China, No. 30770994.

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Peng Qi
    • 1
  • Can-ping Ruan
    • 2
  • Hao Wang
    • 3
  • Fei-guo Zhou
    • 4
  • Xin-yun Xu
    • 2
  • Xing Gu
    • 1
  • Yun-peng Zhao
    • 1
  • Tong-hai Dou
    • 5
  • Chun-fang Gao
    • 1
  1. 1.Department of Laboratory Medicine, Eastern Hepatobiliary HospitalSecond Military Medical UniversityShanghaiChina
  2. 2.Department of General Surgery, Changzheng HospitalSecond Military Medical UniversityShanghaiChina
  3. 3.Department of Laboratory Medicine, Changzheng HospitalSecond Military Medical UniversityShanghaiChina
  4. 4.Department of Hepatic Surgery, Eastern Hepatobiliary HospitalSecond Military Medical UniversityShanghaiChina
  5. 5.Institute of GeneticsFudan UniversityShanghaiChina

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