Answer
Gliolan (5-aminolevulinic acid) is metabolised to fluorescent protoporphyrin IX (PPIX), which accumulates more in malignant glioma tissue than normal brain and fluoresces red or pink under blue light, allowing visualisation through a suitably modified neurosurgical microscope.
Sources for this answer
- Gliolan 30mg/ml powder for oral solutionmedac Pharma LLP · emc · SmPC §5.1 Pharmacodynamic properties · Version 9Document updated
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