据某些生化学家报道,服用维生素A、C和E可大大降低患癌症的危险,这是由于:维生素A其基本作用是促进上皮细胞分化,故具有抑制癌症发生的作用,另外还具有改变癌细胞生长的能力,使癌组织转变为正常组织,维生素A不足可引起细胞分化和上皮组织化生。实验证明,维生素A不足的动物易患癌瘤,如缺乏维生素A的大鼠,对黄曲霉毒素B_1所致的结肠癌,3-甲基胆蒽所致的肺癌及亚硝酸盐所致的膀胱淋巴瘤作用较为敏感。维生素A不足的人群中癌症发生率较正常人群高2.2倍,因此有人把血清维生素A水平视为人类癌症发病的一项监测指标。英国M.Kicks博士据实验认为如果膀胱癌患者投给维生素 According to some biochemists, taking vitamins A, C, and E can greatly reduce the risk of cancer. This is due to the fact that: Vitamin A’s basic role is to promote epithelial cell differentiation, so it has a role in inhibiting the occurrence of cancer, but also has changed The ability of cancer cells to grow turns cancerous tissue into normal tissue. Insufficient vitamin A can cause cell differentiation and epithelial metaplasia. Experiments have shown that animals with vitamin A deficiency are prone to cancer, such as rats lacking vitamin A, colon cancer caused by aflatoxin B_1, and lung cancer caused by 3-methylcholanthrene and urinary bladder caused by nitrite. The role of lymphoma is more sensitive. The incidence of cancer in people with vitamin A deficiency is 2.2 times higher than that of the normal population. Therefore, the level of serum vitamin A is considered as a monitoring indicator of the incidence of human cancer. Dr. M.Kicks, UK, according to the experiment that if bladder cancer patients give vitamins