众所周知,人类许多癌症的发病率和死亡率与其环境因素密切相关,而环境中某些元素缺乏可能是其重要因素之一。早在1915年就有人提出过硒可作为抗癌药物的推测。经过几十年来的共同努力,人们在流行病学、实验研究等方面积累了大量数据,越来越多的资料表明,硒缺乏和许多癌症发 It is well-known that the morbidity and mortality of many cancers in mankind are closely related to their environmental factors, and the lack of certain elements in the environment may be one of the important factors. As early as 1915, it was suggested that selenium can be used as an anti-cancer drug speculation. After decades of joint efforts, people have accumulated a large amount of data in epidemiology, experimental research and other fields, and more and more data indicate that selenium deficiency and many cancers