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XRCC3 Thr241Met polymorphism and ovarian cancer risk: a meta-analysis.

ABSTRACT:

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Genetic polymorphism of X-ray repair crosscomplementing group 3 (XRCC3) Thr241Met has been implicated to alter the risk of ovarian cancer, but the results are controversial. In order to get a more precise result, a meta-analysis was performed. All eligible studies were identified through an extensive search in PubMed, Excerpta Medica Database (Embase), Chinese National Knowledge Infrastructure database, and Chinese Biomedical Literature Database before August 2013. The association between the XRCC3 Thr241Met polymorphism and ovarian cancer risk was conducted by odds ratios (ORs) and 95% confidence intervals (95% CIs). Finally, a total of four publications including seven studies with 3,635 cases and 5,473 controls were included in our meta-analysis. Overall, there was no association between XRCC3 Thr241Met polymorphism and risk of ovarian cancer under all five genetic models in overall population (T vs. C: OR = 0.99, 95 % CI = 0.960-1.03, P = 0.752; TT vs. CC: OR = 1.00, 95% CI = 0.91-1.10, P = 0.943; TC vs. TT: OR = 0.97, 95% CI = 0.92-1.04, P = 0.396, Fig. 1; TT vs.

Tc/cc

OR = 1.00, 95% CI = 0.91-1.12, P = 0.874; TT/TC vs. CC: OR = 0.98, 95% CI = 0.94-1.03, P = 0.486). In the subgroup analysis according to ethnicity, the results suggested that XRCC3 Thr241Met polymorphism was not associated with the risk of ovarian cancer in Caucasians population. No significant association was found between the XRCC3 Thr241 Met polymorphism and the risk of ovarian cancer. Given the limited sample size and ethnicities included in the meta-analysis, further large scaled and well-designed studies are needed to confirm our results.

SUBMITTER: Yan Y

PROVIDER: S-EPMC3967082 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:BACKGROUND:The X-ray repair cross-complementing group 3 (XRCC3) is an efficient component of homologous recombination and is required for the preservation of chromosomal integrity in mammalian cells. The association between Thr241Met single-nucleotide polymorphism (SNP) in this gene and susceptibility to breast cancer has been assessed in several studies. Yet, reports are controversial. The present meta-analysis has been designed to identify whether this SNP is associated with susceptibility to breast cancer. METHODS:We performed a systematic review and meta-analysis for retrieving the case-control studies on the associations between T241?M SNP and the risk of breast cancer. Crude odds ratios (ORs) and 95% confidence intervals (CIs) were calculated to verify the association in dominant, recessive, and homozygote inheritance models. RESULTS:We included 55 studies containing 30,966 sporadic breast cancer cases, 1174 familial breast cancer cases and 32,890 controls in the meta-analysis. In crude analyses, no association was detected between the mentioned SNP and breast cancer risk in recessive, homozygote or dominant models. However, ethnic based analysis showed that in sporadic breast cancer, the SNP was associated with breast cancer risk in Arab populations in homozygous (OR (95% CI)?=?3.649 (2.029-6.563), p?=?0.0001) and recessive models (OR (95% CI)?=?4.092 (1.806-9.271), p?=?0.001). The association was significant in Asian population in dominant model (OR (95% CI)?=?1.296, p?=?0.029). However, the associations was significant in familial breast cancer in mixed ethnic-based subgroup in homozygote and recessive models (OR (95% CI)?=?0.451 (0.309-0.659), p?=?0.0001, OR (95% CI)?=?0.462 (0.298-0.716), p?=?0.001 respectively). CONCLUSIONS:Taken together, our results in a large sample of both sporadic and familial cases of breast cancer showed insignificant role of Thr241Met in the pathogenesis of this type of malignancy. Such results were more conclusive in sporadic cases. In familial cases, future studies are needed to verify our results.

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XRCC3 Thr241Met polymorphism and ovarian cancer risk: a meta-analysis.

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Tc/cc

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