my dad had bowel and liver cancer. he survived for 3 years after the op to remove the bowel tumour and a brief course of chemo. he lived by himself and it was only the last week of his life that he became 'uncomfortable' (his words), his whole stomach area had swollen up due to fluid. he was admitted to the hospice where they tried to drain some of the fluid but were unsuccessful. he was pursuaded to have a little morphine, which up to that point he had refused. i don't believe he was in much pain at all, it seemed to be his distended stomach which caused the uncomfortableness. he slipped into a coma two days after morphine was started and died very peacefully two days later, six days after being admitted to the hospice.
i believe i could have managed him at home if he had wanted it. i'm sure as you go along and come to each decision you have to make, circumstances will dictate the right way to go both for you and your friend. all the best to you :)