Instead of replicating to an organised plan and forming normal tissue, cancer cells multiply madly.

癌细胞会疯狂的增殖，而不是按照预定好的程序复制并形成正常的组织。

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In non-invasive breast cancer, cells grow too much but haven't started to invade normal surrounding healthy tissue.

(在非侵袭式乳癌中，细胞过度生长但没有开始入侵周围的正常健康组织)。

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Laboratory studies showed that the new cells derived from foetal tissue behaved and functioned just like their normal ones in developing ears.

实验室内的研究表明这些源自胎儿组织生长出来的新细胞能够在发育中的耳朵里像其它正常细胞一样发挥功能与工作。

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Since the protein needed to transform 5-fluorocytosine could only be churned out by souped-up stem cells, only the gliomas were exposed to the poison, killing them but sparing normal tissue, which the stem cells ignored.

ECONOMIST: Cancer treatment

Tissue cells, instead of performing the normal self-repair of damaged tissue, begin laying down excessive layers of collagen to help build a scar.

FORBES: Scar Wars

"We're already using the fact that 5t4 is found in cancer cells, but not in normal tissue, to design immunotherapy against it and are testing two such systems in clinical trials, " said Professor Stern.

BBC: NEWS | Health | Molecule 'helps cancer to spread'