众所周知,癌症的预防和治疗还是一个远未解决的问题。据统计癌症已占居民中各种死亡病因的第一、二位。其中90%以上死于上皮组织恶性肿瘤的转移。上皮恶性肿瘤从其发生到出现症状大约需要10—20年的漫长岁月。因此,如能找到控制癌前状态的药物,可能会收到良效。目前正在研究试用的维生素 A 及其合成类似物引起 As we all know, cancer prevention and treatment is still a far-reaching problem. According to statistics, cancer has accounted for the first and second places in the cause of death among residents. More than 90% of them died of epithelial malignant tumor metastasis. Epithelial malignancies require about 10-20 years long before they develop symptoms. Therefore, if you can find a drug that controls the precancerous state, you may receive good results. Currently investigating the trial of vitamin A and its synthetic analogues