目前已发现的抗癌药不下数百种,它们都能有效地杀伤癌细胞。但为什么临床化疗并不十分理想呢?这是因为这些药物都有以下两种缺点:一、敌我不分,既可杀伤癌细胞,也可杀伤正常细胞;二、多向分布,在癌内不能达到有效浓度而限制了治疗效果。因此,科学家们绞尽脑汁想寻找一种既能杀伤癌细胞而又不伤害正常细胞的理想方法。几经周折,国外科 At present, there are no fewer than hundreds of anti-cancer drugs that have been found. They can effectively kill cancer cells. But why clinical chemotherapy is not very ideal? This is because these drugs have the following two disadvantages: First, the enemy and I, can not only kill cancer cells, but also kill normal cells; Second, multi-directional distribution, in the cancer can not The effective concentration is limited and the therapeutic effect is limited. Therefore, scientists are racking their brains to find an ideal way to kill cancer cells without harming normal cells. After several setbacks, the national surgery