We had a neighbor die of Kennedy's cancer type, Malignant Glioma (sp?). She had several seizures which caused paralysis and that paralysis persisted until her death. It was actually quite a gruesome ordeal for her, and her family. That kind of cancer is quite insidious and unrelenting.
But when one goes into the brain with the intensive type of brain surgery he had along with the intense chemo [not sure if he had radiation] those seizures will only become worse which is what will cause his death.