表皮生长因子受体通常促进细胞的生长发育，一旦发生基因变异，会使细胞不受控制地生长。细胞不受控制地生长，这正是癌症的特征。

EGFR normally promotes cell growth and development, and when mutated, allows the uncontrolled growth of cells that is the hallmark of cancer.

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癌症的一个定义特征是快速产生异常细胞，这些细胞超越其通常边界生长并可侵袭身体的毗邻部位和扩散到其它器官。

One defining feature of cancer is the rapid creation of abnormal cells that grow beyond their usual boundaries, and which can then invade adjoining parts of the body and spread to other organs.

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当然，他当年只看到了癌症致命的一面，并没有认识到癌症的其他特征。

But, of course, he was looking only at cancers that killed. He never saw the others.

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