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That's used to shrink the cancer, to try and keep it at bay for longer.
Scientists reckon a new treatment regime for patients with the deadliest type of brain tumour could potentially extend their lives.
A breakthrough in research by a team at Imperial College London have found a way to drain amino acid and make GBM tumours more susceptible to radiotherapy.
That's used to shrink the cancer, to try and keep it at bay for longer.