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Open Access Highly Accessed Research article

The association of APE1 −656T > G and 1349 T > G polymorphisms and cancer risk: a meta-analysis based on 37 case-control studies

Bin Zhou1, Hailin Shan1, Ying Su1, Kai Xia1, Xiaxia Shao2, Weidong Mao2 and Qing Shao13*

Author Affiliations

1 Department of General Surgery, Jiangyin People's Hospital, South-East University, Jiangyin, China

2 Department of Oncology, Jiangyin People's Hospital, South-East University, Jiangyin, China

3 Department of General Surgery, Jiangyin People's Hospital, 163 Shoushan Road, Jiangyin 214400, China

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BMC Cancer 2011, 11:521  doi:10.1186/1471-2407-11-521

Published: 18 December 2011

Abstract

Background

APE1 (apurinic/apyrimidinic endonuclease 1) is an important DNA repair protein in the base excision repair pathway. Polymorphisms in APE1 have been implicated in susceptibility to cancer; however, results from the published studies remained inconclusive. The objective of this study was to conduct a meta-analysis investigating the association between polymorphisms in APE1 and the risk for cancer.

Methods

The PubMed and Embase databases were searched for case-control studies published up to June, 2011 that investigated APE1 polymorphisms and cancer risk. Odds ratios (ORs) and 95% confidence intervals (CIs) were used to assess the strength of the associations.

Results

Two polymorphisms (−656 T > G, rs1760944 and 1349 T > G, rs1130409) in 37 case-control studies including 15, 544 cancer cases and 21, 109 controls were analyzed. Overall, variant genotypes (GG and TG/GG) of −656 T > G polymorphism were associated with significantly decreased cancer risk in homozygote comparison (OR = 0.81, 95%CI: 0.67-0.97), dominant model comparison (OR = 0.89, 95%CI: 0.81-0.97) and recessive model comparison (OR = 0.90, 95%CI: 0.82-0.98), whereas the 1349 T > G polymorphism had no effects on overall cancer risk. In the stratified analyses for −656 T > G polymorphism, there was a significantly decreased risk of lung cancer and among Asian populations.

Conclusions

Although some modest bias could not be eliminated, the meta-analysis suggests that APE1 −656 T > G polymorphism has a possible protective effect on cancer risk particularly among Asian populations whereas 1349 T > G polymorphism does not contribute to the development of cancer.

Keywords:
cAPE1; Single nucleotide polymorphism; Cancer risk; Meta-analysis