My dad 72 was diagnosed with a gbm grade 4 in July. He has some of the tumour removed but no further treatment other than 10 sessions of palliative radiation. He has poor quality of life. How long can he survive without treatment? He is currently in a hospice for respite. He suffers lots of confusion, legs are getting weaker, speech is bad, eyesight nearly gone, appetite very poor and in last 2 weeks sleeping a lot more yet doctors say he has another 2 to 3 months to live!!! Can he possibly survive this long?