Asian Pacific Journal of Cancer Prevention

Asian Pacific Journal of Cancer Prevention (아시아태평양암예방학회)
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Methylenetetrahydrofolate Reductase Gene C677T Polymorphism and Lung Cancer: an Updated Meta-analysis

  • Hou, Xin-Heng (Department of Respiratory Medicine, the Affiliated Jiangyin Hospital of Southeast University Medical School) ;
  • Huang, Yu-Min (Nanjing Medical University) ;
  • Mi, Yuan-Yuan (The Third Affiliated Hospital of Nantong University)
  • Published : 2012.05.30
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Abstract

Objective: Methylenetetrahydrofolate reductase (MTHFR) catalyzes the metabolism of folate and nucleotides needed for DNA synthesis and repair. Variations in MTHFR functions likely play roles in the etiology of lung cancer (LC). So far, several studies between MTHFR C677T polymorphism and LC provide controversial or inconclusive results. Methods: To better assess the purported relationship, we performed a meta-analysis of 14 publications. Eligible studies were identified by searching the Pubmed, Embase, Web of Science and Google Scholar databases. Odds ratios (ORs) with 95% confidence intervals (CIs) were estimated to assess the association. Results: Overall, no significant association was detected between the MTHFR C677T polymorphism and LC risk, the same as in race subgroup. However, in the stratified analysis by histological type, significantly increased non-small-cell lung cancer (NSCLC) risk was indicated (T-allele vs. C-allele: OR = 1.11, 95%CI = 1.03-1.19; TT vs. CC: OR = 1.24, 95%CI = 1.09-1.41; TC vs. CC: OR = 1.11, 95%CI = 1.03-1.20 and TT+TC vs. CC: OR = 1.09, 95%CI = 1.03-1.15). At the same time, ever-smokers who carried T-allele (TT+TC) had a 10% decreased LC risk compared with CC genotype carriers. Conclusions: Our study provided evidence that the MTHFR 677T null genotype may increase NSCLC risk, however, it may protect ever-smokers against LC risk. Future studies with large sample sizes are warranted to further evaluate this association in more detail.

Keywords

References

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