科学家10多年来试图创造出一种疫苗,其能刺激癌症病人的免疫系统来攻击肿瘤,但癌细胞灵敏地避免了这一攻击.用小鼠进行的研究现提示一种新方法来战胜肿瘤细胞的防御,而重整免疫系统攻击肿瘤的作用.先前用疫苗战胜肿瘤的防御的试图,都因激惹免疫系统不加区别地攻击正常细胞而引 Scientists have for over a decade attempted to create a vaccine that stimulates cancer patients’ immune systems to attack tumors, but cancer cells are immune to this attack. Studies in mice now suggest a new way to beat tumor cells Defense of the immune system to re-establish the role of the tumor in attacking the tumor. Previous attempts to defeat the defenses of tumors with vaccines have been directed at provoking indiscriminate attacks on normal cells by the immune system