1 November 2011
Last updated at 03:17
By James Gallagher
Health reporter, BBC News
The tumour glows under UV light
The idea of making brain cancers glow to help surgeons operate is being tested in the UK.
Patients will be given a drug, 5-amino-levulinic acid (5-ALA), which causes a build-up of fluorescent chemicals in the tumour.
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