硒是生物体中唯一受基因调控的微量元素,而癌症的发生与基因休戚相关。因此,硒的防癌抗癌作用很早就被广泛地研究。目前已有大量的资料表明,硒具有抗癌、抗氧化、增强机体免疫力、保护心血管等广泛的生物学作用,对癌症、心血管疾病、慢性疾病等有良好的预防和治疗效果。癌症防控不可缺“硒”流行病学调查证实,不同人群中癌症的发生率与硒的摄入量有关,癌症患者血清中的硒水平明显低于健康人群,并且硒水平与消化道肿瘤、胆道肿瘤、泌尿系统肿瘤、胰腺癌、乳腺癌、卵巢癌等癌前病变密切相关。同时,环境中硒的水平 Selenium is the only gene in the organism regulated by trace elements, and the occurrence of cancer and genes are related. Therefore, anti-cancer effect of selenium has long been widely studied. At present, a large amount of data shows that selenium has a wide range of biological effects such as anti-cancer, antioxidation, immunity enhancement and cardiovascular protection, and has good preventive and curative effects on cancer, cardiovascular diseases and chronic diseases. Cancer prevention and control indispensable “Selenium ” epidemiological survey confirmed that the incidence of cancer in different populations and selenium intake, serum selenium levels in cancer patients was significantly lower than healthy people, and selenium levels and gastrointestinal Tumors, biliary tumors, urinary tract tumors, pancreatic cancer, breast cancer, ovarian cancer and other precancerous lesions are closely related. At the same time, the level of selenium in the environment