This helps the cancer build up genetic diversity between cells within the tumour.

这就帮助癌症在肿瘤细胞之间建立基因的多样化。

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Acute and chronic hypoxia might lead to different biology within the tumour and this might have a direct effect on the design of new therapies for the treatment of hypoxic tumours.

急性和慢性乏氧可能在肿瘤中导致不同的生物学效应，并且其可能对于乏氧肿瘤治疗的新疗法设计直接产生影响。

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The Chicago team overcame this problem by activating the production of a body chemical called LIGHT within a tumour.

BBC: NEWS | Health | Immune boost 'widens cancer fight'

Cancer cells can differ hugely within a tumour - it helps them develop ways to resist drugs and spread round the body.

BBC: Thriving cancer's 'chaos' explained

They reasoned that if stem cells were resistant in people as well as mice, then the proportion of stem cells within a tumour would increase as more vulnerable cells were killed off in disproportionate numbers.

ECONOMIST: Cancer therapy