The disease resists treatment with chemotherapy and radiation, and spreads so effectiely throughout the brain that a surgeon can no more remoe eery last cell than a picky eater could remoe eery bit of cheese from a casserole.

• 化疗和放疗对这种病效果不大，并且该病会迅速蔓延这个脑部，外科手术不可能将每个癌细胞都清除干净。