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Thanks To A New Technique, Brain Cancer, Especially The Most Common Form, Glioblastoma , Can Now Be More Safely Removed And With Fewer Complications. The Fluorescent Marker, 5-aminolevulinic acid or 5-ALA, After A Patient Drinks It, Makes It Easy For Surgeons To Identify The Tumors Via The Marker’s Pinkish Glow Under Light.

Brain cancer: drink that makes tumours glow could make surgery more effective | Science | The Guardian

https://www.theguardian.com/science/2018/nov/04/brain-cancer-tumour-glow-surgery

Fluorescent marker accumulates in the fastest-growing cells, helping surgeons pinpoint tumours and leave healthy tissue alone