title: Combined effect of CYP1B1 codon 432 polymorphism and N-acetyltransferase 2 slow acetylator phenotypes in relation to breast cancer in the Turkish population.
abstract: BACKGROUND
  Breast cancer (BC), is more prevalent in subjects who have had prolonged exposure to heterocyclic amines, aromatic amines and high levels of oestradiol. Cytochrome P450 1B1 (CYP1B1) and N-acetyltransferase2 (NAT2) have complementary role in metabolism of xenobiotics such as arylamines and heterocyclic amines, CYP1B1 also hyroxylates 17-beta oestradiol. CYP1B1*3 polymorphism and seven missense and four silent polymorphisms of NAT2 were investigated.
  
  
  METHODS
  Sixty Turkish female BC patients and 103 healthy controls were phenotyped by polymerase chain reaction (PCR) based restriction fragment length polymorphism (RFLP).
  
  
  CONCLUSIONS
  The distribution of NAT2 activity in the healthy control group was found to be correlated with that of healthy caucasians. Patients had slow acetylator phenotypes of NAT2, 1.8 times higher than controls but no statistical differences were found (p=0.07). In addition, the NAT2*5 alelle was more statistically correlated with breast cancer patients rather than the controls (p=0.02). Moreover, NAT2*5B was the most frequent haplotype of the NAT2*5 family (p=0.000). Breast cancer patients were detected to posses more CYP1B1*3 mutant alleles than the controls (p=0.043). The combined effect of CYP1B1*3 polymorphism and NAT2 slow acetylator genotype contributed to an increased risk for breast cancer in patients in this study (p=0.004).
authors.affiliation: Department of Molecular Medicine, Institute of Experimental Medicine (DETAE), Istanbul University, Vakif Gureba Cad Sehremini, Istanbul, Turkey.
authors.forename: Yasemin K
authors.initials: YK
authors.lastname: Ozbek
authors.forename: Tülin
authors.initials: T
authors.lastname: Oztürk
authors.forename: Bora M
authors.initials: BM
authors.lastname: Tüzüner
authors.forename: Zerrin
authors.initials: Z
authors.lastname: Calay
authors.forename: Sennur
authors.initials: S
authors.lastname: Ilvan
authors.forename: Fatih M
authors.initials: FM
authors.lastname: Seyhan
authors.forename: Halil I
authors.initials: HI
authors.lastname: Kisakesen
authors.forename: Oguz
authors.initials: O
authors.lastname: Oztürk
authors.forename: Turgay
authors.initials: T
authors.lastname: Isbir
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000483:Alleles; D001189:Aryl Hydrocarbon Hydroxylases; D001191:Arylamine N-Acetyltransferase / Q000235:genetics* / Q000378:metabolism*; D001943:Breast Neoplasms / Q000201:enzymology* / Q000235:genetics*; D016022:Case-Control Studies; D003062:Codon; D065633:Cytochrome P-450 CYP1B1; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics* / Q000378:metabolism; D005260:Female; D006801:Humans; D008875:Middle Aged; D009154:Mutation; D010641:Phenotype; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D012150:Polymorphism, Restriction Fragment Length; D014421:Turkey; D055815:Young Adult
chemical_list: D003062:Codon; D003577:Cytochrome P-450 Enzyme System; D001189:Aryl Hydrocarbon Hydroxylases; C585496:CYP1B1 protein, human; D065633:Cytochrome P-450 CYP1B1; D001191:Arylamine N-Acetyltransferase; C478900:NAT2 protein, human