Pharmacology experiment set up high middle, low three dosages group to observe the three dosages group resist the tumour effect to little mouse S-180, the result showed, middle dosage was effectivest.

药理实验设高、中、低三个剂量组，观测三个剂量组对小鼠S-180的抗瘤效应，结果显示，苦参碱脂质体中剂量对小鼠S-180抗瘤效应最好。

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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