This study is being done to answer the following question: Can a patient’s life be extended by adding a type of radiation therapy called whole-brain radiation therapy that avoids the hippocampus to preserve memory plus the medication memantine that is FDA approved to treat dementia to the usual treatment?
This study aims to find out if adding Hippocampal-Avoidant Whole Brain Radiotherapy and memantine is better or worse than the usual approach for your brain cancer.