Open Question: My best friend has osephagus cancer, he has had chemo and radiotherapy.?

He always goes into consultations on his own. He only has mum and dad and us few friends, so nobody knows what prognosis is. He has lost lots of weight and can no longer eat solid foods, of any kind, and is on energy drinks and shakes now. He last resort is to have stent put in , but does not think he can tolerate the procedure. How long do you think he may have left as we want to make his life left as pleasant as possible.