Patients with aggressive brain tumours could benefit from improved surgery outcomes by drinking a substance that makes their cancer glow pink, a trial suggests. For the trial, scientists gave patients with suspected glioma (a type of tumor that occurs in the brain and spinal cord) a drink containing 5-ALA, a substance that accumulates in fast-growing cancer cells and makes them glow pink. The hope is that the glowing tumours will be easier for surgeons to safely remove, as they can be more easily distinguished from healthy brain tissue. Glioma is the most common type of brain cancer and treatment usually involves removing as much of the tumour as possible. The prognosis for patients, however, is usually poor. Speaking about the trial, Dr Kathreena Kurian, study author and associate professor in brain tumour research at the University of Bristol, said: “There's an urgent need to have something while the patient is on the table, while the neurosurgeon is operating, which will guide them to find the worst bits. “The beauty of 5-ALA is that they can see where high-grade glioma is, while they're operating.” The results of the trial have not yet been published, but were presented at the 2018 NCRI Cancer Conference in Glasgow over the weekend. The next step, the researchers say, is to test 5-ALA in children with brain tumours.