My grandmother, who died a few years ago at the age of 90 was diagnosed at 75 with advanced colon cancer and doctors gave her a year max to live. She had an extreme will to live and went full raw diet and very low calories as soon as she was diagnosed. For 15 years she only raw foods, lost a ton of weight and shocked the doctors. Prior to her change, she did not have a bowel movement for over 6 months, soon after her lifestyle change things went back to normal, her cancer shrunk and she was able to pull through another 15 years without medical intervention.
My point with this is, if there is a true will, incredible things are possible.