title: CYP2C19 polymorphisms in patients with gastric and colorectal carcinoma.
abstract: BACKGROUND
  It has been reported that up to 80% of human cancers arise as a consequence of environmental exposure and host susceptibility factors. Environmental carcinogens are predominantly metabolized by the cytochrome P450 (CYP) superfamily of drug- or xenobiotic-metabolizing enzymes. Genetic variations in these enzymes affect individuals' susceptibility to carcinogens.
  
  
  OBJECTIVE
  The aim of this study was to evaluate the relationship between CYP2C19 polymorphism and susceptibility to these cancers by means of CYP2C19 genotyping among Turkish subjects.
  
  
  METHODS
  DNAof subjects were isolated from leukocytes by high pure template preparation kit (Roche Diagnostics, GmbH, Mannheim, Germany) and genotypes were detected by LightCycler CYP2C19 Mutation Detection Kit by real-time PCR with LightCycler instrument (Roche Diagnostics, cat. no. 3113914).
  
  
  RESULTS
  Being male was associated with a 3.5-fold (OR: 4.27, CI: 2.27-8.05) and 4.27-fold (OR: 3.50, CI: 1.948-6.301) risk for colorectal and gastric carcinoma, respectively. The CYP2C19*3 heterozygote genotype was not found in either gastric or colorectal carcinoma patients. Although the frequency of CYP2C19*2 heterozygote genotype is high in patients with gastric and colorectal carcinoma, it is not significantly associated with cancer (OR: 1.79, CI: 0.829-3.865 and OR: 1.998, CI: 0.961-4.154, respectively).
  
  
  CONCLUSIONS
  Although the frequency of CYP2C19*2 heterozygote genotype is high in our patients with gastric and colorectal carcinoma, there is no the relationship between CYP2C19 polymorphism and susceptibility to these cancer.
authors.affiliation: Department of Biochemistry, Mersin University, Turkey. lutamer@yahoo.com
authors.forename: L
authors.initials: L
authors.lastname: Tamer
authors.forename: B
authors.initials: B
authors.lastname: Ercan
authors.forename: S
authors.initials: S
authors.lastname: Ercan
authors.forename: N
authors.initials: N
authors.lastname: Ateş
authors.forename: C
authors.initials: C
authors.lastname: Ateş
authors.forename: K
authors.initials: K
authors.lastname: Ocal
authors.forename: M
authors.initials: M
authors.lastname: Dirlik
authors.forename: S
authors.initials: S
authors.lastname: Aydin
authors.forename: U
authors.initials: U
authors.lastname: Atik
mesh_terms: D001189:Aryl Hydrocarbon Hydroxylases / Q000235:genetics* / Q000378:metabolism; D015179:Colorectal Neoplasms / Q000235:genetics*; D065731:Cytochrome P-450 CYP2C19; D004273:DNA, Neoplasm / Q000235:genetics / Q000302:isolation & purification; D005260:Female; D006580:Genetic Carrier Screening; D020022:Genetic Predisposition to Disease; D006801:Humans; D008297:Male; D006899:Mixed Function Oxygenases / Q000235:genetics* / Q000378:metabolism; D016017:Odds Ratio; D011110:Polymorphism, Genetic; D012727:Sex Characteristics; D013274:Stomach Neoplasms / Q000235:genetics*; D015262:Xenobiotics / Q000378:metabolism
chemical_list: D004273:DNA, Neoplasm; D015262:Xenobiotics; D006899:Mixed Function Oxygenases; D001189:Aryl Hydrocarbon Hydroxylases; C045793:CYP2C19 protein, human; D065731:Cytochrome P-450 CYP2C19