title: Glu346Lys polymorphism in the methyl-CpG binding domain 4 gene and the risk of primary lung cancer.
abstract: BACKGROUND
  Methyl-CpG binding domain 4 (MBD4) protein functions as a DNA repair enzyme and minimizes mutations at 5-methylcytosine. Polymorphisms in the DNA repair gene MBD4 may be associated with differences in DNA repair capacity and thereby influence an individual's susceptibility to lung cancer. To test this hypothesis, we examined the potential association between the MBD4 Glu346Lys polymorphism and the risk of lung cancer in a Korean population.
  
  
  METHODS
  The MBD4 Glu346Lys genotypes were determined in 432 lung cancer patients and 432 healthy age- and gender-matched control subjects.
  
  
  RESULTS
  The distribution of the MBD4 Glu346Lys genotypes was not significantly different between the overall lung cancer cases and the controls. However, when the cases were categorized by tumor histology, the Lys346Lys genotype was associated with a significantly decreased risk of adenocarcinoma (AC) as compared with the Glu346Glu genotype [adjusted odds ratio (OR) = 0.50, 95% confidence interval (CI) = 0.26-0.97, P = 0.04]. On the stratification analysis, the protective effect of the Lys346Lys genotype against AC was statistically significant in older individuals and heavier smokers (adjusted OR = 0.08, 95% CI = 0.01-0.64, P = 0.02; and adjusted OR = 0.09, 95% CI = 0.01-0.72, P = 0.02, respectively).
  
  
  CONCLUSIONS
  Our findings suggest that the MBD4 Glu346Lys polymorphism could be used as a marker for genetic susceptibility to AC of the lung.
authors.affiliation: Department of Internal Medicine, Kyungpook National University, Daegu, Korea.
authors.forename: Moo Chul
authors.initials: MC
authors.lastname: Shin
authors.forename: Su Jeong
authors.initials: SJ
authors.lastname: Lee
authors.forename: Jin Eun
authors.initials: JE
authors.lastname: Choi
authors.forename: Sung Ick
authors.initials: SI
authors.lastname: Cha
authors.forename: Chang Ho
authors.initials: CH
authors.lastname: Kim
authors.forename: Won Kee
authors.initials: WK
authors.lastname: Lee
authors.forename: Sin
authors.initials: S
authors.lastname: Kam
authors.forename: Young Mo
authors.initials: YM
authors.lastname: Kang
authors.forename: Tae Hoon
authors.initials: TH
authors.lastname: Jung
authors.forename: Jae Yong
authors.initials: JY
authors.lastname: Park
mesh_terms: D044503:5-Methylcytosine / Q000378:metabolism; D000230:Adenocarcinoma / Q000235:genetics*; D000368:Aged; D014408:Biomarkers, Tumor / Q000235:genetics; D018288:Carcinoma, Small Cell / Q000235:genetics; D002294:Carcinoma, Squamous Cell / Q000235:genetics; D004260:DNA Repair / Q000235:genetics / Q000502:physiology; D004706:Endodeoxyribonucleases / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D005838:Genotype; D006801:Humans; D008175:Lung Neoplasms / Q000235:genetics*; D008297:Male; D016555:Matched-Pair Analysis; D008875:Middle Aged; D011110:Polymorphism, Genetic; D012306:Risk
chemical_list: D014408:Biomarkers, Tumor; D044503:5-Methylcytosine; D004706:Endodeoxyribonucleases; C118712:MBD4 protein, human