Hi and welcome to HCM,thank you for your query.
It seems like this is terminal stage of malignant disease unfortunately. I suppose that he is not a candiadate for surgical procedure anymore and he is probably too weak for chemotherapy
so the tretament is paliative and it is hard to predict his life expectancy. it is most important now to fight against pain an dinfections and give him emotional support.
Wish you good health. Regards