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• W2116431379 endingPage "373" @default.
• W2116431379 startingPage "365" @default.
• W2116431379 abstract "Esophageal cancer represents one of the most common and lethal cancers around the World. Some areas of South America, including parts of Brazil, present the highest incidence of the disease in the West. The main etiological factors that have been associated with the disease in Brazil are alcohol consumption, tobacco smoking and, in the South, consumption of hot maté. Nitrosamines are the only carcinogens capable of inducing tumors in the esophagus of experimental animals, with the rat being the most susceptible species, mainly due to tissue specific metabolic activation by CYP enzymes. Studies of CYP2A expression in the esophagus of rodents suggest an association between CYP2A expression and esophageal susceptibility to tumor induction. CYP2A6 and CYP2E1, the main enzymes to activate nitrosamines in humans, are the only carcinogen activating CYP enzymes to be expressed in the esophagus of Brazilians. Patients who presented high levels of CYP2A6 expression could activate nitrosamines at rates comparable to the rat. This expression profile is different from those present in French patients. We investigated 34 Brazilian patients regarding the risk associated with polymorphisms in drug metabolizing enzymes and TP53 mutations. A GSTP1 polymorphism presented a clear risk to white and non-white patients to develop esophageal cancer. GSTM1 null polymorphism also seemed to be associated with an increased risk. CYP2A6, CYP2E1, SOD2, and GSTT1 polymorphisms were not associated with an increased risk of esophageal cancer. TP53 mutations occurred mostly in exon 7, differing from the mutation profile found in the IARC database. The preliminary results obtained with polymorphisms of drug metabolizing enzymes and TP53 mutations need to be confirmed in a larger number of samples in order to compare the mechanisms of esophageal cancer development in Brazilians with that of other populations." @default.
• W2116431379 created "2016-06-24" @default.
• W2116431379 creator A5073371102 @default.
• W2116431379 date "2003-11-01" @default.
• W2116431379 modified "2023-10-16" @default.
• W2116431379 title "Mechanisms of esophageal cancer development in Brazilians" @default.
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• W2116431379 doi "https://doi.org/10.1016/j.mrrev.2003.06.021" @default.
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