Your primary source of energy should be saturated fat. Cancer can only feed on sugar. Complex carbohydrates all get reduced down into simple sugars. Look into the Ketogenic diet.
Coconut oil is very good for you. Avoid all vegetable oil, canola oil, palm oil etc. which are all Omega 6 fatty acids. You need to increase your Omega 3 with things like fish and even algae like Spirolina are very beneficial.
All cells need oxygen the cause of cancer is inflammation caused by inflammatory foods. Things like gluten cause a lot of inflammation.
Also be careful with fish due to the amount of mercury in them, but you do need the Omega 3s somehow.