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美国华盛顿州研究人员进行了一项病例对照研究，以调查摄入的硝酸盐与鼻咽癌的危险性之间的关系。硝酸盐通常是作为防腐剂而加入食物中的。鼻咽癌在世界大多数地方是很少见的，但在中国东南部却发病率很高。中国华南鼻咽癌高发可归因与大量食用广东风味的成鱼所致，因成鱼中含
Washington state researchers conducted a case-control study to investigate the relationship between nitrate intake and the risk of nasopharyngeal cancer. Nitrates are usually added to foods as preservatives. Nasopharyngeal cancer is rare in most parts of the world, but it is endemic in southeastern China. High incidence of nasopharyngeal carcinoma in southern China can be attributed to large quantities of Guangdong-induced adult fish due to adult fish containing