该药并未以某个肿瘤细胞为靶点，而是激活免疫系统更好的对抗肿瘤细胞。

It doesn't target a specific part of the cell.Instead, it stimulates the patient's immune system to allow it to better fight the cancer.

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科学家们可能还没发现那种不老药，但一种叫雷帕霉素的药物，已用来抑制器官移植受体的免疫系统，很接近。

Scientists probably haven't stumbled on that drug yet, but a drug called rapamycin, already used to suppress the immune systems of organ transplant recipients, comes close.

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该药通过绑定并摧毁一种名为ctla4的蛋白质而起作用，CTLA4是在免疫系统表面发现得T细胞。

The drug works by binding to, and disabling, a protein called CTLA4, which is found on the surface of the immune system's T-cells.

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