Parotid gland cancer

Salivary gland cancer- a very close friend of mine has stage 4 Parotid gland cancer. He is single and does not have anyone who is looking out for him. Does anyone have experience with this type of cancer and recommendations of a good cancer center to consult. He is fairly convinced that it’s not looking good and is content that he has lived a good life. He is being very passive in his treatment.
I would pass on any suggestions with full knowledge that it is his life and his decision as to whether to pursue other options.