RecruitingPhase 2Drug trialOptimizing Neurocognition With Whole Brain Radiation Therapy (WBRT) Using Upfront Pulsed Reduced Dose-Rate (PRDR) TechniqueStudy patients will receive Whole-brain radiation therapy (WBRT) - pulsed reduced dose rate (PRDR) within 14 days of registration. All patients will receive single daily fractions using 3D conformal radiotherapy. A dose of 30 Gy in 10 fractions will be delivered using the PRDR technique.