title: Genetic polymorphisms of the DNA repair gene and risk of nasopharyngeal carcinoma.
abstract: BACKGROUND
  X-ray repair cross-complementing groups 1 and 3 (XRCC1 and XRCC3) and xeroderma pigmentosum group D (XPD) are mainly involved in base excision repair, homologous recombination repair, and nucleotide excision repair of DNA repair pathways, respectively. Previous studies have demonstrated that their gene polymorphisms were associated with some cancer susceptibility.
  
  
  OBJECTIVE
  To investigate the effect of XPD Lys751Gln, XRCC1 Arg399Gln, Arg194Trp, Arg280His, and XRCC3 Thr241Met polymorphisms on the risk of nasopharyngeal carcinoma (NPC), a population-based case-control study of 153 NPC patients and 168 healthy controls among Sichuan population was conducted.
  
  
  RESULTS
  Our results showed that XRCC1 codon 194 Trp allele was associated with an increased risk of NPC (odds ratio [OR] = 1.828, 95% confidence interval [CI]: 1.286-2.598), and XPD codon 751Gln allele was associated with a borderline decrease of NPC (OR = 0.600, 95% CI: 0.361-1.000); combination analysis showed that individuals with both putative genotypes of XPD codon 751 Lys/Lys and XRCC1 codon 194 Arg/Trp or Trp/Trp have a significantly elevated risk of NPC (OR = 2.708, 95% CI: 1.338-5.478).
  
  
  CONCLUSIONS
  The results indicated that XRCC1 codon 194 Trp allele and XPD codon 751 Lys allele may be contributing factors in the risk of NPC.
authors.affiliation: Department of Forensic Biology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, Sichuan, China.
authors.forename: Zhi-Hui
authors.initials: ZH
authors.lastname: Yang
authors.forename: Bin
authors.initials: B
authors.lastname: Du
authors.forename: Ye-Sheng
authors.initials: YS
authors.lastname: Wei
authors.forename: Jun-Hui
authors.initials: JH
authors.lastname: Zhang
authors.forename: Bin
authors.initials: B
authors.lastname: Zhou
authors.forename: Wei-Bo
authors.initials: WB
authors.lastname: Liang
authors.forename: Jing
authors.initials: J
authors.lastname: Jia
authors.forename: Bei-Lei
authors.initials: BL
authors.lastname: Zhang
authors.forename: Lin
authors.initials: L
authors.lastname: Zhang
mesh_terms: D000328:Adult; D019943:Amino Acid Substitution; D004260:DNA Repair / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D006801:Humans; D008297:Male; D008875:Middle Aged; D009303:Nasopharyngeal Neoplasms / Q000453:epidemiology / Q000235:genetics* / Q000473:pathology; D009367:Neoplasm Staging; D011110:Polymorphism, Genetic; D012016:Reference Values; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012307:Risk Factors; D000076105:X-ray Repair Cross Complementing Protein 1; D014983:Xeroderma Pigmentosum / Q000235:genetics
chemical_list: D004268:DNA-Binding Proteins; D000076105:X-ray Repair Cross Complementing Protein 1; C000619371:XRCC1 protein, human