A high-tech 'pink drink', swallowed hours before surgery, is helping surgeons spot aggressive brain cancers, by making tumours glow in the dark. The innovation, now being used by neurosurgeons across the UK, doubles the chances doctors will find – and remove – all the cancer, halting progression of the disease. The drink, called Gliolan or '5-ALA', uses a dye that reacts with a compound in the cancer which glows a ...