title: MspI and Ile462Val polymorphisms in CYP1A1 and overall cancer risk: a meta-analysis.
abstract: BACKGROUND
  Cytochrome P450 1A1 (CYP1A1) is a member of the CYP1 family, which is a key enzyme in the metabolism of many endogenous substrates and exogenous carcinogens. To date, many studies have examined the association between CYP1A1 MspI and Ile462Val polymorphisms and cancer risk in various populations, but their results have been conflicting rather than consistent.
  
  
  METHODS
  To assess this relationship more precisely, a meta-analysis based on 198 publications was performed. Odds ratios (OR) and corresponding 95% confidence intervals (CIs) were used to assess the association. The statistical heterogeneity across studies was examined with a chi-square-based Q-test.
  
  
  RESULTS
  Overall, a significant elevated risk of cancer was associated with CYP1A1 MspI and Ile462Val polymorphisms for all genetic models studied. Further stratified analysis by cancer types revealed that the MspI polymorphism may increase the risk of lung cancer and cervical cancer whereas the Ile462Val polymorphism may contribute to a higher risk of lung cancer, leukemia, esophageal carcinoma, and prostate cancer. In the subgroup analysis by ethnicity, obvious associations were found in the Asian population for the MspI polymorphism while an increased risk of cancer was observed in Asians and Caucasians for the Ile462Val polymorphism.
  
  
  CONCLUSIONS
  The results of this meta-analysis suggest that CYP1A1 MspI and Ile462Val polymorphisms contribute to increased cancer susceptibility among Asians. Additional comprehensive system analyses are required to validate this association and other related polymorphisms.
authors.affiliation: Department of Urology, The Affiliated Jiangyin Hospital of Southeast University Medical College, Wuxi, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Wu
authors.affiliation: Department of Urology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China.
authors.forename: Kang
authors.initials: K
authors.lastname: Liu
authors.affiliation: The First Clinical Medical College, Nanjing Medical University, Nanjing, China.
authors.forename: Huaxing
authors.initials: H
authors.lastname: Huang
authors.affiliation: Department of Urology, The Affiliated Jiangyin Hospital of Southeast University Medical College, Wuxi, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Yuan
authors.affiliation: Department of Orthopedics, The Affiliated Hospital of Medical College, Qingdao University, Qingdao, China.
authors.forename: Wanqing
authors.initials: W
authors.lastname: Yuan
authors.affiliation: Department of Urology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China.
authors.forename: Shangqian
authors.initials: S
authors.lastname: Wang
authors.affiliation: Department of Urology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China.
authors.forename: Tingting
authors.initials: T
authors.lastname: Chen
authors.affiliation: Department of Urology, The Affiliated Jiangyin Hospital of Southeast University Medical College, Wuxi, China.
authors.forename: Hu
authors.initials: H
authors.lastname: Zhao
authors.affiliation: Department of Urology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China.
authors.forename: Changjun
authors.initials: C
authors.lastname: Yin
mesh_terms: D044466:Asian People / Q000235:genetics*; D019363:Cytochrome P-450 CYP1A1 / Q000235:genetics*; D019003:Deoxyribonuclease HpaII / Q000378:metabolism; D056726:Genetic Association Studies; D006801:Humans; D008957:Models, Genetic; D020125:Mutation, Missense / Q000235:genetics; D009369:Neoplasms / Q000235:genetics*; D016017:Odds Ratio; D011110:Polymorphism, Genetic / Q000235:genetics*; D015183:Restriction Mapping
chemical_list: C569463:CYP1A1 protein, human; D019363:Cytochrome P-450 CYP1A1; D019003:Deoxyribonuclease HpaII