I’ve had 2 people in my life with brain tumors who were diagnosed in January and are already gone. If he has what they say he has....he’s not getting better (even temporarily).
I had a first cousin die from brain cancer at 41. He was a talkative, jovial sort of person and when I saw him alive the last time he was cracking jokes while sitting in a chair and could still walk to the bathroom alone. Six days later he was dead.