title: Methylenetetrahydrofolate reductase 677C>T polymorphism and gastric cancer susceptibility in Mexico.
abstract: This study investigated whether methylenetetrahydrofolate reductase MTHFR 677C>T polymorphism modified gastric cancer (GC) risk independently as well as in combination with folate intake and alcohol consumption. A hospital-based case-control study of 201 cases and 427 controls was conducted in three geographical areas of Mexico, between 1994 and 1996. The MTHFR 677T allele frequency was 51.0% in cases compared with 45.3% in controls. After controlling for dietary sources of folate, alcohol intake and other selected variables, a significant increase in GC risk was found among carriers of the 677TT genotype compared with those with the 677CC genotype (odds ratio (OR) 1.62, 95% confidence interval (CI) 1.00-2.59), with a significant trend (P = 0.048). There were no significant interactions between the MTHFR polymorphism and consumption of folate and alcohol. Our results suggest that the high prevalence of MTHFR 677T allele may be a contributor to the high rate of morbidity and mortality in GC in Mexico.
authors.affiliation: Center for Population Health Research, National Institute of Public Health, Av. Universidad No. 655, Col. Santa Ma. Ahuacatitlán, 62508 Cuernavaca, Morelos, Mexico.
authors.forename: Marina
authors.initials: M
authors.lastname: Lacasaña-Navarro
authors.forename: Marcia
authors.initials: M
authors.lastname: Galván-Portillo
authors.forename: Jia
authors.initials: J
authors.lastname: Chen
authors.forename: Malaquías
authors.initials: M
authors.lastname: López-Cervantes
authors.forename: Lizbeth
authors.initials: L
authors.lastname: López-Carrillo
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000428:Alcohol Drinking / Q000453:epidemiology; D005260:Female; D005492:Folic Acid / Q000008:administration & dosage; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D005838:Genotype; D006801:Humans; D008297:Male; D042965:Methylenetetrahydrofolate Reductase (NADPH2) / Q000235:genetics*; D008800:Mexico / Q000453:epidemiology; D008875:Middle Aged; D011110:Polymorphism, Genetic / Q000235:genetics*; D012307:Risk Factors; D013274:Stomach Neoplasms / Q000201:enzymology / Q000453:epidemiology / Q000235:genetics*
chemical_list: D005492:Folic Acid; D042965:Methylenetetrahydrofolate Reductase (NADPH2)