Cadernos de Saúde Pública
On-line version ISSN 1678-4464
Print version ISSN 0102-311X
MARCHIONI, Dirce Maria Lobo; GATTAS, Gilka Jorge Figaro; CURIONI, Otavio A. and CARVALHO, Marcos Brasilino de. Interaction between dietary intake and GSTM1 and GSTT1 polymorphisms in head and neck cancer risk: a case-control study in São Paulo, Brazil. Cad. Saúde Pública [online]. 2011, vol.27, n.2, pp.379-387. ISSN 1678-4464. http://dx.doi.org/10.1590/S0102-311X2011000200019.
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.
Keywords : Glutathione Transferase; Genetic Polymorphism; Head and Neck Neoplasms.