title: [Polymorphisms in detoxification genes CYP1A1, CYP2E1, GSTT1 and GSTM1 in gastric cancer susceptibility].
abstract: Cytochrome P450 (CYP) and glutathione S-transferase (GST) enzymes are involved in activation and detoxification of many potential carcinogens. Genetic polymorphisms in those enzymes have been found to influence the interindividual susceptibility to cancer. Some polymorphisms of those enzymes have been associated specifically with susceptibility to gastric cancer. We conducted a study in a Costa Rican population, where gastric cancer incidence and mortality rates are among the highest in the world. We investigated whether such variations affected the risk of developing gastric cancer. Subjects included 31 with gastric cancer, 58 controls with gastric injures others than cancer and 51 normal controls confirmed by X-rays (double-contrast) or endoscopic diagnostic. DNA from peripheral white blood cell was obtained from all subjects. Deletion of GSTT1 and GSTM1 was assessed by multiplex PCR and genotyping of CYP2E1 was performed using a PCR-based restriction fragment length polymorphism assay with the restriction enzyme PstI and the gene CYP1A1 using the restriction enzyme MspI The prevalence of CYP1A1 Msp1 polymorphism, GSTT1 and GSTM1 null genotype was similar in the three groups of individuals (p = 0.73, p = 0.88 y p = 0.89 respectively). Our findings suggest that the polymorphism CYP2E1 PstI could be associated with a reduced risk of having gastric cancer (OR = 0.09, IC95%:0.01 - 0.83).
authors.affiliation: Instituto de Investigaciones en Salud, Universidad de Costa Rica, 2060, San José, Costa Rica. auxigv@costarricense.cr
authors.forename: Auxiliadora
authors.initials: A
authors.lastname: González
authors.forename: Vanessa
authors.initials: V
authors.lastname: Ramírez
authors.forename: Patricia
authors.initials: P
authors.lastname: Cuenca
authors.forename: Rafaela
authors.initials: R
authors.lastname: Sierra
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019883:Alkyl and Aryl Transferases / Q000235:genetics*; D001189:Aryl Hydrocarbon Hydroxylases / Q000235:genetics*; D014408:Biomarkers, Tumor / Q000235:genetics; D016022:Case-Control Studies; D019363:Cytochrome P-450 CYP1A1 / Q000235:genetics; D019392:Cytochrome P-450 CYP2E1 / Q000235:genetics; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics; D005838:Genotype; D005982:Glutathione Transferase / Q000235:genetics; D006801:Humans; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic / Q000235:genetics*; D012307:Risk Factors; D012720:Severity of Illness Index; D013274:Stomach Neoplasms / Q000201:enzymology / Q000235:genetics*
chemical_list: D019883:Alkyl and Aryl Transferases; D001189:Aryl Hydrocarbon Hydroxylases; D014408:Biomarkers, Tumor; D019363:Cytochrome P-450 CYP1A1; D019392:Cytochrome P-450 CYP2E1; D005982:Glutathione Transferase; C413545:glutathione S-transferase T1