微量元素硒是一种新发现的具有多种功能的人类生命活动过程中必不可少的微量元素。在缺硒的情况下，少量化学致癌剂能导致实验动物具有很高的死亡率。如给动物补充硒元素，能使某些化学致癌剂和致癌作用显著降低。如乳腺癌、宫颈癌。白血病等的死亡率，均与人体内硒的水平有着? Trace element selenium is an indispensable microelement found in newly discovered human life activities with multiple functions. In the absence of selenium, a small amount of chemical carcinogens can lead to high mortality in experimental animals. The addition of selenium to animals can significantly reduce certain chemical carcinogens and carcinogenic effects. Such as breast cancer, cervical cancer. Mortality such as leukemia is related to the level of selenium in the human body?