Asian Pacific Journal of Cancer Prevention

Asian Pacific Journal of Cancer Prevention (아시아태평양암예방학회)
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Allele and Genotype Frequencies of the Polymorphic Methylenetetrahydrofolate Reductase and Lung Cancer in ther Jordanian Population: a Case Control Study

  • Al-Motassem, Yousef (Department of Biopharmaceutics and Clinical Pharmacy, Faculty of Pharmacy, The University of Jordan) ;
  • Shomaf, Maha (Department of Pathology, Faculty of Medicine, The University of Jordan) ;
  • Said, Ismail (Department of Biochemistry, Molecular Biology Research Lab, Faculty of Medicine, The University of Jordan) ;
  • Berger, Sondra (Department of Pharmaceutical and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina) ;
  • Ababneh, Nidaa (Department of Biochemistry, Molecular Biology Research Lab, Faculty of Medicine, The University of Jordan) ;
  • Diab, Ola (Department of Biopharmaceutics and Clinical Pharmacy, Faculty of Pharmacy, The University of Jordan) ;
  • Obeidat, Nathir (Department of Internal Medicine, Faculty of Medicine, The University of Jordan) ;
  • Awidi, Abdallah (Thrombosis and Molecular Hematology Laboratory, Department of Medicine and Hematology, Faculty of Medicine, The University of Jordan)
  • Published : 2015.04.29
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Abstract

Background: Methylenetetrahydrofolate reductase (MTHFR) is involved in amino acid synthesis and DNA function. Two common polymorphisms are reported, C677T and A1298C, that are implicated in a number of human diseases, including cancer. Objective: The association between MTHFR C677T and A1298C genotype and haplotype frequencies in risk for lung cancer (LC) was investigated in the Jordanian population. Materials and Methods: A total of 98 LC cases were studied for MTHFR C677T and A1298C polymorphisms, compared to 89 controls taken from the general population, employing the PCR-RFLP technique. Results: The frequency of the genotypes of MTHFR C677T among Jordanians was: CC, 59.6%, CT, 33%; and TT, 7.4% among LC cases and 49.4%, 40.2% and 10.3% among controls. No significant association was detected between genetic polymorphism at this site and LC. At MTHFR A12987C, the genotype distribution was AA, 29.5%; AC, 45.3%, and CC 25.3% among LC cases and 36.8%, 50.6% and 12.6% among controls. Carriers of the CC genotype were more likely to have LC (OR=2.5; 95%CI: 1.04-6; p=0.039) as compared to AA carriers. Smokers and males with the CC genotype were 9.9 and 6.7 times more likely to have LC, respectively ($OR_{smokers}=9.9$; 95%CI: 1.2-84.5, p=0.018; $OR_{men}=6.6$; 95%CI: 1.7-26.2, p=0.005). Haplotype analysis of MTHFR polymorphism at the two loci showed differential distribution of the CC haplotype (677C-1298C) between cases and controls. The CC haplotype was associated with an increased risk for lung cancer (OR=1.6; 95% CI: 1.03-2.4, p=0.037). Conclusions: The genetic polymorphism of MTHFR at 1298 and the CC haplotype (risk is apparently lower with the C allele at position 677) may modulate the risk for LC development among the Jordanian population. Risk associated with the 1298C allele is increased in smokers and in males. The results indicate that a critical gene involved in folate metabolism plays a modifying role in lung cancer risk, at least in the Jordanian population.

Keywords

References

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