留美老师带你每日说英文第831期:癌症难以治疗的原因

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台湾籍旅美老师今天交给我们的句子是：

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.
常见的状况是：新药对实验室培养出的细胞有效，但对病患做临床实验时却失败。恶性肿瘤之所以复杂的其中一个原因，就是在于它能分裂增殖出许多仅有些微差异的癌细胞群。