留美老師帶你每日說英文第831期:癌症難以治療的原因

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臺灣籍旅美老師今天交給我們的句子是：

It's frequently the case that new drugs, which work on these lab-grown cells, will fail in clinical trials with real patients. One of the complexities of aggressive tumors is that they can have multiple populations of slightly different cancerous cells.
常見的狀況是：新藥對實驗室培養出的細胞有效，但對病患做臨牀實驗時卻失敗。惡性腫瘤之所以複雜的其中一個原因，就是在於它能分裂增殖出許多僅有些微差異的癌細胞羣。