癌症干细胞（Cancer Stem Cell，CSC），又称癌干细胞、肿瘤干细胞，是指具有干细胞(Stem cell)性质的癌细胞，也就是具有“自我复制”(self-renewal)以及“具有多细胞分化”(differentiation)等能力。
更令人困惑的是癌症干细胞的隐藏能力。
More disconcerting is the ability of a cancer stem cell to hide.
设计出一个可以区分癌症干细胞和组成健康组织细胞的药物虽非易事，但是却颇有希望。
And there is the problem of designing drugs that can distinguish between cancer stem cells and those that spin off healthy tissues. But it all looks promising.
最后，研究者们将这些癌症干细胞注射到免疫低下的小鼠脑部并检测生成的肿瘤中的血管。
Finally, the researchers injected these cancer stem cells into the brains of mice with weakened immune systems and then examined the blood vessels within the resulting tumors.
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