**Chemical Carcinogenesis and Nasopharyngeal Carcinoma**

Faqing Tang1, Xiaowei Tang2, Daofa Tian3 and Ya Cao4 *1Zhuhai Hospital, Jinan University, Guang Dong, 2Metallurgical Science and Engineering, Central South University, Changsha, Hunan, 3The First Affiliated Hospital, The Hunan University of Traditional- Chinese, Changsha, Hunan, 4Cancer Research Institute of Xiangya School of Medicine, Central South University, Changsha, Hunan, P.R. China* 
