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A hospital-based case-control study was conducted to investigate the potential interaction between dietary factors and polymorphisms in phase II metabolic enzymes GSTM1 and GSTT1, associated with head and neck cancer risk. The study included 103 histologically confirmed incident cases and 101 controls. Food intake was estimated with a validated food frequency questionnaire. The gene polymorphisms were evaluated by PCR. Increased risk was observed in the highest tertile of beef consumption in the presence of the GSTM1 (OR = 10.79; 95%CI: 2.17-53.64) and GSTT1 null alleles (OR = 3.41; 95%CI: 0.43-27.21). Assessment of dietary intake considering the ratio between animal product and vegetable consumption showed OR = 2.35 (95%CI: 0.27-19.85) in the intermediate tertile and OR = 3.36 (95%CI: 0.41-27.03) in the highest tertile. The results suggest a possible interaction between meat intake and GSTM1/GSTT1 polymorphisms in modulating the risk of head and neck cancer, influenced by vegetable consumption.

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Interação entre consumo alimentar e polimorfismos da GSTM1 e GSTT1 no risco para o câncer de cabeça e pescoço: estudo caso-controle em São Paulo, Brasil