Portal de Periódicos da CAPES

Artigo Produção Nacional Revisado por pares

BIBTEX RIS

Polymorphisms of GSTP1 and GSTT1, but not of CYP2A6, CYP2E1 or GSTM1, modify the risk for esophageal cancer in a western population

2007; Oxford University Press; Volume: 28; Issue: 12 Linguagem: Inglês

10.1093/carcin/bgm222

1460-2180

Ana Rossini, Davy Rapozo, Sheila Coelho Soares-Lima, Denise Peixoto Guimarães, Maria Aparecida dos Santos Ferreira, Ricardo Henrique de Oliveira Braga Teixeira, Cleber Dario Pinto Kruel, Sérgio Gabriel Silva de Barros, Nelson Adami Andreollo, Rodolfo Acatauassu, H.J.de Matos, Rodolpho Mattos Albano, Luís Felipe Ribeiro Pinto,

Genomics, phytochemicals, and oxidative stress

Esophageal cancer is among the most common and fatal tumors in the world. Eighty percent of esophageal tumors are esophageal squamous cell carcinoma (ESCC). Brazil is one of the high incidence areas in the West, where tobacco and alcohol consumption have been associated with ESCC. However, polymorphisms in xenobiotic metabolizing genes may also contribute to the risk. Therefore, in this study, we analyzed the risk of ESCC associated with tobacco and alcohol consumption and with polymorphisms of CYP2A6 ( CYP2A6*2 ), CYP2E1 ( CYP2E1*5B , CYP2E1*6 ), GSTP1 (Ile105Val), GSTM1 and GSTT1 null genotypes in 126 cases and 252 age- and gender-matched controls. Data on the amount, length and type of tobacco and alcohol consumed were collected, and DNA was extracted from blood lymphocytes from all individuals. Polymorphisms were analyzed by polymerase chain reaction (PCR)–multiplex ( GSTM1 and T1 ), PCR–Restriction Fragment Length Polymorphism ( CYP2E1*5B and *6 and GSTP1 Ile105Val) or allele-specific PCR amplification ( CYP2A6*2 ). Risks were evaluated by multivariate conditional regression analysis. As expected, tobacco [odds ratio (OR) = 6.71, 95% confidence interval (95% CI) 3.08–14.63] and alcohol (OR = 16.98, CI 7.8–36.98) consumption, independently or together (OR = 26.91, CI 13.39–54.05) were risk factors. GSTP1 Ile105Val polymorphism was an independent risk factor (OR = 2.12, CI 1.37–3.29), whereas GSTT1 wild-type was an independent protective factor for ESCC (OR = 0.37, CI 0.16–0.79). There was ∼80% statistical power to detect both results. There was no risk associated with CYP2A6 , CYP2E1 and GSTM1 polymorphisms. In conclusion, this study suggests an opposite role of GSTP1 and GSTT1 polymorphisms for the risk for ESCC.