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ZJUS-B
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology)  2013, Vol. 14 Issue (1): 47-57    DOI: 10.1631/jzus.B1200218
Articles     
Association of CASP9, CASP10 gene polymorphisms and tea drinking with colorectal cancer risk in the Han Chinese population
He Liu, Xia Jiang, Ming-wu Zhang, Yi-feng Pan, Yun-xian Yu, Shan-chun Zhang, Xin-yuan Ma, Qi-long Li, Kun Chen
Department of Epidemiology and Health Statistics, School of Medicine, Zhejiang University, Hangzhou 310058, China; Institute of Cancer Research and Prevention of Jiashan County, Jiashan 314100, China
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Abstract  The initiators caspase-9 (CASP9) and caspase-10 (CASP10) are two key controllers of apoptosis and play important roles in carcinogenesis. This study aims to explore the association between CASPs gene polymorphisms and colorectal cancer (CRC) susceptibility in a population-based study. A two-stage designed population-based case-control study was carried out, including a testing set with 300 cases and 296 controls and a validation set with 206 cases and 845 controls. A total of eight tag selected single nucleotide polymorphisms (SNPs) in CASP9 and CASP10 were chosen based on HapMap and the National Center of Biotechnology Information (NCBI) datasets and genotyped by restriction fragment length polymorphism (RFLP) assay. Multivariate logistic regression models were applied to evaluate the association of SNPs with CRC risk. In the first stage, from eight tag SNPs, three polymorphisms rs4646077 (odds ratio (OR)AA+AG: 0.654, 95% confidence interval (CI): 0.406–1.055; P=0.082), rs4233532 (ORCC: 1.667, 95% CI: 0.967–2.876; ORCT: 1.435, 95% CI: 0.998–2.063; P=0.077), and rs2881930 (ORCC: 0.263, 95% CI: 0.095–0.728, P=0.036) showed possible association with CRC risk. However, none of the three SNPs, rs4646077 (ORAA+AG: 1.233, 95% CI: 0.903–1.683), rs4233532 (ORCC: 0.892, 95% CI: 0.640–1.243; ORCT: 1.134, 95% CI: 0.897–1.433), and rs2881930 (ORCC: 1.096, 95% CI: 0.620–1.938; ORCT: 1.009, 95% CI: 0.801–1.271), remained significant with CRC risk in the validation set, even after stratification for different tumor locations (colon or rectum). In addition, never tea drinking was associated with a significantly increased risk of CRC in testing set together with validation set (OR: 1.755, 95% CI: 1.319–2.334). Our results found that polymorphisms of CASP9 and CASP10 genes may not contribute to CRC risk in Chinese population and thereby the large-scale case-control studies might be in consideration. In addition, tea drinking was a protective factor for CRC.

Key words： CASP9      CASP10      Colorectal cancer      Single nucleotide polymorphisms      Susceptibility to cancer      Tea drinking     
Received: 16 August 2012      Published: 08 January 2013
CLC:  R181.3+3  
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He Liu
Kun Chen
Ming-wu Zhang
Xia Jiang
Yi-feng Pan
Yun-xian Yu
Shan-chun Zhang
Xin-yuan Ma
Qi-long Li
Cite this article:

He Liu, Xia Jiang, Ming-wu Zhang, Yi-feng Pan, Yun-xian Yu, Shan-chun Zhang, Xin-yuan Ma, Qi-long Li, Kun Chen. Association of CASP9, CASP10 gene polymorphisms and tea drinking with colorectal cancer risk in the Han Chinese population. Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2013, 14(1): 47-57.

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http://www.zjujournals.com/xueshu/zjus-b/10.1631/jzus.B1200218     OR     http://www.zjujournals.com/xueshu/zjus-b/Y2013/V14/I1/47

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