Objective： To evaluate the association of Glutathione S-transferase （GST） M1 and T1 genetic polymorphisms and susceptibility to nasopharyngeal carcinoma （NPC） in a high risk area of Guangxi Zhuang Autonomous Regi...Objective： To evaluate the association of Glutathione S-transferase （GST） M1 and T1 genetic polymorphisms and susceptibility to nasopharyngeal carcinoma （NPC） in a high risk area of Guangxi Zhuang Autonomous Region （province）, Southwest of China. Methods： A case-control study was conducted to investigate the genetic polymorphisms of these enzymes （GSTM1 and GSTT1 null genotypes）. A total of 127 NPC cases and 207 controls were recruited. Results： GSTM1 and GSTT1 null genotype frequencies were higher among NPC patients at a level of statistical significance （P〈0.005; P〈0.001 respectively）, and both GSTM1 and GSTT1 null genotype were even more significant （P〈0.001）. Conclusion： NPC is the most common cancer in Guangxi. GST enzymes are involved in the detoxification of many environmental carcinogens. Homozygous deletions of GSTM1 and GSTT1 have been associated with several types of cancer. The risk to develop NPC has been associated with environmental factors such as cigarette smoking and EB virus infection. The present results indicate that the GSTM1 and GSTT1 deletion polymorphisms are associated with an increase risk of susceptibility to NPC, and both detoxific enzyme genes deletion is more important than a single gene deletion for the susceptibility to NPC.展开更多
Objective： The purpose of this study was to evaluate cyclooxygenase-2 （COX-2） expression in nasopharyngeal carcinoma （NPC） and its correlation with clinicopathologic features, angiogenesis, and prognosis. Methods...Objective： The purpose of this study was to evaluate cyclooxygenase-2 （COX-2） expression in nasopharyngeal carcinoma （NPC） and its correlation with clinicopathologic features, angiogenesis, and prognosis. Methods： The expressions of COX-2 and vascular endothelial growth factor （VEGF） and microvascular density （MVD） were determined with immunohistochemical methods in eighty-six NPC patients followed up over 5 years. Results： Sixty-three tumors （73.3%） were classified as COX-2 positive. COX-2 expression was positively related to VEGF expression （r=0.438, P〈0.01） and correlated with the tumor pathological grade, extent of primary lesion, lymph node metastasis, distant metastasis and shorter survival. Conclusion： Our results suggest that COX-2, being highly expressed and strongly correlated with angiogenesis in nasopharyngeal carcinoma, is apt to be used as a predictor of prognosis, including local recurrence and distant metastasis.展开更多
文摘Objective： To evaluate the association of Glutathione S-transferase （GST） M1 and T1 genetic polymorphisms and susceptibility to nasopharyngeal carcinoma （NPC） in a high risk area of Guangxi Zhuang Autonomous Region （province）, Southwest of China. Methods： A case-control study was conducted to investigate the genetic polymorphisms of these enzymes （GSTM1 and GSTT1 null genotypes）. A total of 127 NPC cases and 207 controls were recruited. Results： GSTM1 and GSTT1 null genotype frequencies were higher among NPC patients at a level of statistical significance （P〈0.005; P〈0.001 respectively）, and both GSTM1 and GSTT1 null genotype were even more significant （P〈0.001）. Conclusion： NPC is the most common cancer in Guangxi. GST enzymes are involved in the detoxification of many environmental carcinogens. Homozygous deletions of GSTM1 and GSTT1 have been associated with several types of cancer. The risk to develop NPC has been associated with environmental factors such as cigarette smoking and EB virus infection. The present results indicate that the GSTM1 and GSTT1 deletion polymorphisms are associated with an increase risk of susceptibility to NPC, and both detoxific enzyme genes deletion is more important than a single gene deletion for the susceptibility to NPC.
文摘Objective： The purpose of this study was to evaluate cyclooxygenase-2 （COX-2） expression in nasopharyngeal carcinoma （NPC） and its correlation with clinicopathologic features, angiogenesis, and prognosis. Methods： The expressions of COX-2 and vascular endothelial growth factor （VEGF） and microvascular density （MVD） were determined with immunohistochemical methods in eighty-six NPC patients followed up over 5 years. Results： Sixty-three tumors （73.3%） were classified as COX-2 positive. COX-2 expression was positively related to VEGF expression （r=0.438, P〈0.01） and correlated with the tumor pathological grade, extent of primary lesion, lymph node metastasis, distant metastasis and shorter survival. Conclusion： Our results suggest that COX-2, being highly expressed and strongly correlated with angiogenesis in nasopharyngeal carcinoma, is apt to be used as a predictor of prognosis, including local recurrence and distant metastasis.
