Try fasting. Go 24 hours without food and little (water) or no drink. Do this once a month when you don't have cancer, and maybe more when you do. The theory behind it: Some cancers such as Chordoma are reliant on mTOR, which fasting inhibits or modulates. (This is also why Rapamycin is being researched for cancer treatment, though its mTOR effect is mild.) Theory part 2: tumors tend to have a lot of glycogen, which is unavailable when fasting. The body still needs it so it will pull some from tumors if necessary.