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Open Access Research

RAD51 Gene 135G/C polymorphism and the risk of four types of common cancers: a meta-analysis

Dan Cheng12, Huimin Shi12, Kan Zhang12, Lingling Yi12 and Guohua Zhen12*

Author Affiliations

1 Department of Respiratory and Critical Care Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China

2 Key Laboratory of Respiratory Diseases, Ministry of Health, Wuhan, Hubei, China

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Diagnostic Pathology 2014, 9:18  doi:10.1186/1746-1596-9-18

Published: 23 January 2014

Abstract

Objectives

RAD51 gene plays an important role in the pathogenesis of squamous cell carcinoma of the head and neck (SCCHN), colorectal cancer, ovarian cancer and acute leukaemia. A number of studies assessed the association between RAD51 135G/C polymorphism and the risk of these cancers in different population. However, the results have been inconclusive. We performed a systematic meta-analysis to evaluate the association between RAD51 135G/C polymorphism and the risk of these four types of cancer.

Methods

Pubmed, Cochrane library and Chinese Biomedical Literature Database (CBM) were searched for case-control studies on RAD51 135G/C polymorphism and the risk of SCCHN, colorectal cancer, ovarian cancer and acute leukaemia published up to Oct 31, 2013. Odds ratios (ORs) with 95% confidence intervals (CIs) were used to assess the strength of association.

Results

A total of twenty-two published studies, with 6836 cases and 8507 controls were included. Overall, no significant association was found between RAD51 135G/C polymorphism and the risk of the four types of cancers (G/G vs. C/C: OR = 0.83, 95% CI: 0.43-1.59, P = 0.57). However, there was a significant association between this polymorphism and SCCHN risk in the subgroup analysis by cancer type (G/G vs. C/C: OR = 2.46, 95% CI: 1.08-5.61, P = 0.03).

Conclusion

The RAD51 135G/C polymorphism was associated with the risk of SCCHN.

Virtual slides

The virtual slide(s) for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs/1383180234106945 webcite.

Keywords:
RAD51; Single nucleotide polymorphism; Cancer risk; Meta-analysis