title: CYP1A1 gene polymorphisms in modifying the association between passive smoking and primary dysmenorrhea.
abstract: OBJECTIVE
  This study investigated whether the association between passive smoking exposure and primary dysmenorrhea is modified by two susceptibility genes, cytochrome P450 1A1 (CYP1A1)MspI and CYP1A1HincII.
  
  
  METHODS
  We recruited 1645 female textile workers from 1997 to 2000 in Anqing, China, collecting information about passive smoking and status of primary dysmenorrhea and taking blood samples. We analyzed the association of CYP1A1 gene polymorphisms and passive smoking exposure with primary dysmenorrhea using multiple logistic regression.
  
  
  RESULTS
  In the passive smoking group, women who had the C/C6235 genotype (odds ratio [OR] = 1.8; 95% confidence intervals [CI] = 1.0-3.3) in CYP1A1MspI and Ile/Ile462 genotype (OR = 2.9; 95% CI = 1.1-7.7) in CYP1A1HincII had increased risk of dysmenorrhea. When stratified by genotype, the adjusted OR of dysmenorrhea was 1.6 (95% CI = 1.2-2.1) for the passive smoking group with the Ile/Ile462 genotype and 1.5 (95% CI = 1.0-2.1) with the C/C6235 genotype, compared with the nonpassive smoking group. The data further showed that there was a significant combined effect between passive smoking and the CYP1A1MspI C/C6235 and HincII Ile/Ile462 genotypes (OR = 2.4; 95% CI = 1.2-4.9).
  
  
  CONCLUSIONS
  CYP1A1MspI and HincII genotypes modified the association between passive smoking and primary dysmenorrhea.
authors.affiliation: Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China.
authors.forename: Na
authors.initials: N
authors.lastname: Li
authors.forename: Hong
authors.initials: H
authors.lastname: Liu
authors.forename: Changzhong
authors.initials: C
authors.lastname: Chen
authors.forename: Fan
authors.initials: F
authors.lastname: Yang
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Li
authors.forename: Zhian
authors.initials: Z
authors.lastname: Fang
authors.forename: Lihua
authors.initials: L
authors.lastname: Wang
authors.forename: Yonghua
authors.initials: Y
authors.lastname: Hu
authors.forename: Dafang
authors.initials: D
authors.lastname: Chen
mesh_terms: D000328:Adult; D002681:China; D019363:Cytochrome P-450 CYP1A1 / Q000235:genetics*; D004412:Dysmenorrhea / Q000209:etiology* / Q000235:genetics; D005260:Female; D006801:Humans; D016015:Logistic Models; D016273:Occupational Exposure; D011110:Polymorphism, Genetic / Q000235:genetics*; D011446:Prospective Studies; D013783:Textile Industry; D014028:Tobacco Smoke Pollution / Q000009:adverse effects*
chemical_list: D014028:Tobacco Smoke Pollution; D019363:Cytochrome P-450 CYP1A1