大量资料证明,鼻咽癌高发病率是在中国和东南亚的一些国家。许多研究指出:吸烟、咸鱼、EB病毒和遗传因素作为致癌物是高发区的重要危险因素。在加利福尼亚州由Henderson等研究的几个种族组所揭示的与鼻咽癌相关的高危险因素:职业接触的烟雾、吸烟、化学物和过去的耳鼻喉病史。 虽然吸烟已涉及到呼吸道各种癌症,但是吸烟与鼻咽癌关系的证据,一般认为是不确切的。Lin等在台湾的报告,吸烟者患鼻咽癌的相对危险性显著增高。在美国两个重要的前瞻性调查中,没有证实关于 A large number of data prove that the high incidence of nasopharyngeal cancer is in some countries in China and Southeast Asia. Many studies have pointed out that smoking, salted fish, Epstein-Barr virus and genetic factors are important risk factors for high-risk areas as carcinogens. High risk factors associated with nasopharyngeal cancer revealed by several ethnic groups studied by Henderson et al. in California: Occupational exposure to smoke, smoking, chemicals, and past history of ENT disease. Although smoking has involved various types of cancer in the respiratory tract, evidence of the relationship between smoking and nasopharyngeal cancer is generally considered inaccurate. Lin et al. reported in Taiwan that the relative risk of smokers suffering from nasopharyngeal cancer was significantly higher. In two important forward-looking surveys in the United States, there was no confirmation about