Sorry to break it to you guys, but if he actually ever even had brain cancer, taking him off his meds will probably not kill him any time soon. My guess because of the long period of time that has passed since the original announcement... is that they have been keeping him out of the public eye because he has Korsakoff syndrome, and is bat $hit crazy. But if he is currently more than a piece of decaying meat hooked to life support, he might even improve enough for his staff to prompt him through a recorded message bashing President Trump and praising the DEmoNcrats once again. They will probably cut out the part where he bites a staff or family member.
If he is near death with a glioma he is laying on his back gurgling at this point.