Is that so bad?
Seems to me many or most cancer patients let doctors cut off pieces and/or inject them with poisons and/or radiate them, and for what?
They end up dying in a few painful years anyway.
Might as well let nature take its course from the get-go.
Try telling my grand daughter, (in her late teens), who is a lymphoma survivor.
Every time he goes to the doctor they keep telling him they are surprised he's still around. The only reason he beat the odds is that he was diagnosed and TREATED very early.
My kids were very young when he was diagnosed. At 13 and 17, they've been blessed with experiencing the special love and attention that a doting grandpa can give - and they know they're richer for it. Had "nature took its course" they would only "know" him second hand through stories and pictures.