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锌、硒等是体内必不可少的微量元素，适当补充能提高自身的抵抗力及抗癌能力，我们国家大多数地方锌硒含量不高，癌前病变患者不少，如果在此阶段乃至于正常人群中适当补硒，将尽大可能延缓癌前病变的进程，减少恶性肿瘤的发生。锌、硒等微量元素与肿瘤发病率相关，消化道恶性肿瘤的病因、病理、病程发展和治疗等与微量元素有密切的关系，铁锌的缺乏是导致恶性肿瘤发生的因素之一。“,”Such as zinc, selenium is an essential trace element in the body and the appropriate supplement can improve their ability of resistance and anti-cancer, zinc, selenium content in most places in our country is not high, patients with precancerous lesions, if appropriate in this stage and normal crowd filling sele-nium, will do big may delay the process of precancerous lesions, reducing the occurrence of malignant tumor. Zinc, selenium and other trace elements, associated with the tumor incidence of digestive tract malignant tumor etiology, pathology, progression and treatment has close relation with trace elements, such as iron and zinc deficiency is one of the factors affect the occurrence of malignant tumor.