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Background and Objectives:Our previous study showed that nonsteroidal anti-inflamatory drug-activated gene (NAG-1) induced apoptosis in tongue cancer cels. However, the NAG-1 expression in tongue cancer and normal tisues was not studied. The aim of this study was to investigate the expression of NAG-1 in oral tongue cancer and normal tissues and to identify the as a valuable prognostic marker in tongue cancer. Subjects and Method:The medical records and pathologic reports of 42 tongue cancer patients who received surgery as primary treatment were surveyed. Tongue cancer and normal tissues, which were obtained during the operation, were stained with anti-NAG-1 antibody using the immunohistochemical method and the H-score was calculated. Results:As a result, the higher expression of NAG-1 was observed in the cancer tissues than in the normal tissues. por prognosis. A 5-year survival rate was significantly decreased in cases showing higher NAG-1 expresion in the cancer tissues than in the normal tisues. Conclusion:The higher NAG-1 expression in the cancer tissue suggests malignant changes in cancer tisue and poor prognosis. Therefore, NAG-1 may be a useful prognostic marker in tongue squamous cel carcinoma. (Korean J Otorhinolaryngol-Head Neck Surg 2007 ;50 :677-83)

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