Participants will receive [6,6-²H₂]-glucose orally at a dose of 0.75g per kg of body weight (maximum 60g), dissolved in 200-500mL of water. Approximately 45 minutes after ingestion, participants will undergo an MRI scan consisting of a 30-minute conventional MRI brain study followed by a 1-hour Deuterium Metabolic Imaging (DMI) study. A Gadolinium contrast agent may be administered if more than 4 weeks have passed since the last enhanced MRI scan.

[6,6-²H₂]-Glucose is a stable isotope-labeled glucose used as a metabolic tracer. It is administered orally to assess glucose metabolism using Deuterium Metabolic Imaging (DMI).

Progression-Free Survival (PFS) is defined as the time from the start of treatment until disease progression or death from any cause, whichever occurs first

Overall Survival (OS) is defined as the time from randomization until death from any cause.