title: Lack of Association between CYP1A1 M2 and M4 Polymorphisms and Breast Carcinoma in Jordanian Women: a Case-Control Study.
abstract: BACKGROUND
  CYP1A1 is a candidate gene for low-penetrance breast cancer susceptibility, as it plays an important role in the metabolism of carcinogens and estrogens.
  
  
  OBJECTIVE
  The objective of this study was to assess the association between M2 (A2455G, Ile462Val) and M4 (C2453A, Thr461Asn) polymorphisms in CYP1A1 and breast cancer risk among Jordanian women and in subgroups stratified by menopausal status and smoking history.
  
  
  METHODS
  Blood samples were collected from 112 breast cancer female patients and 115 age-matched controls who underwent breast cancer screening with imaging and showed negative results (BI- RADS I or BI-RADS II). Genotyping was performed using the PCR-RFLP technique.
  
  
  RESULTS
  No statistically significant overall association was found between breast cancer risk and CYP1A1 M2 genotypes (p-value = 0.55; OR = 0.77; 95% CI= 0.32 - 1.83) nor with the M4 polymorphism (p-value= 0.95; OR= 0.95; 95% CI= 0.51- 1.88). Analysis of subgroups defined by menopausal status or smoking history also revealed no association with these polymorphisms. Furthermore, the four identified haplotypes (AC; AA; GC and GA) were equally distributed among cases and controls, and haplotype analysis showed a strong linkage disequilibrium of both studied loci in either cases or controls (D'=1).
  
  
  CONCLUSIONS
  Based on the study results, CYP1A1 M2 and M4 polymorphisms do not seem to play a major role in breast cancer risk among Jordanian females.
authors.affiliation: Department of Pharmacy, Faculty of Medicine, University of Batna, Algeria E-mail : im.amrani@univ-batna.dz.
authors.forename: Iman
authors.initials: I
authors.lastname: Amrani
authors.forename: Nailya
authors.initials: N
authors.lastname: Bulatova
authors.forename: Abdalla
authors.initials: A
authors.lastname: Awidi
authors.forename: Al-Motassem
authors.initials: AM
authors.lastname: Yousef
authors.forename: Jamal Masad
authors.initials: JM
authors.lastname: Melhem
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Al-Masri
authors.forename: Laila Abu
authors.initials: LA
authors.lastname: Tahoun
mesh_terms: D001943:Breast Neoplasms / Q000235:genetics*; D016022:Case-Control Studies; D019363:Cytochrome P-450 CYP1A1 / Q000235:genetics*; D005260:Female; D005787:Gene Frequency / Q000235:genetics; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D006239:Haplotypes / Q000235:genetics; D006801:Humans; D007597:Jordan; D015810:Linkage Disequilibrium / Q000235:genetics; D008875:Middle Aged; D011110:Polymorphism, Genetic / Q000235:genetics*; D012307:Risk Factors
chemical_list: C569463:CYP1A1 protein, human; D019363:Cytochrome P-450 CYP1A1