title: [Cytochrome P450IA1 and the genetic susceptibility to esophageal carcinoma].
abstract: OBJECTIVE
  To explore the susceptibility to esophageal carcinoma (EC) in different population with different cytochrome P450 IA1 (CYPIA1) genotype, and study the synergistic effects between CYPIA1 and smoking.
  
  
  METHODS
  A case-control study (case = 111, control = 114) was used to compare the frequency of CYPIA1 genotype between EC and controls with a PCR method.
  
  
  RESULTS
  The distribution of three genotypes of CYPIA1 in EC and controls was significantly different (chi(2) = 19.35, P < 0.01). There was a synergistic effect between the mutation of CYPIA1 4,889 site and smoking (SIA = 1.56), and a significant dose-response effect was observed. The risk of individual whose CYPIA1 4,889 site is mutated was 3 times higher than those not mutated.
  
  
  CONCLUSIONS
  The mutation of CYPIA1 ,89 site maybe one of important host susceptible factors of EC, and the risk would increase significantly in smokers.
authors.affiliation: Department of Epidemiology, the Fourth Military Medical University, Xi'an 710033, China.
authors.forename: H
authors.initials: H
authors.lastname: Zhang
authors.forename: C
authors.initials: C
authors.lastname: Sun
authors.forename: L
authors.initials: L
authors.lastname: Li
authors.forename: M
authors.initials: M
authors.lastname: Yan
mesh_terms: D000368:Aged; D016022:Case-Control Studies; D019363:Cytochrome P-450 CYP1A1 / Q000235:genetics*; D004938:Esophageal Neoplasms / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D009154:Mutation; D012907:Smoking / Q000009:adverse effects*
chemical_list: D019363:Cytochrome P-450 CYP1A1