I recommend getting a juicer, and juicing large amounts of Kale, Broccoli, Carrots, Lemons (w/skin), oranges (w/skin).
Get only organic and wash them in Ozone water. Breville sells a nice unit for under $300.
I recommend cutting out all Dairy, Sugar, Wheat and Red meat.
Do not eat fried foods.
Go for things like Raw Cashews, Raw Almonds, Eggs - make omelette's with onion and green pepper. Try a protein smoothy for breakfast, take Living Protein and mix it with a banana and frozen berry mix, it is delicious and nutritious. Do not use any protein containing Casein, it is a carcinogen. Avoid all Dairy derived products!! Keep away from Soy protein, its junk. I'd stick with Egg Protein powder, or Living Protein type.
Do not drink soda or any sweetened beverages. Try to eat raw fresh veggies and nuts, with light proteins like eggs or chicken. Avoid sugar, it really suppresses the immune system.
Juicing is such a powerful tool to get nutrients into the body. Some of the most successful cancer treatments use it, like the Gerson therapy. It trumps ALL vitamin supplements because it provides hundreds of different phytonutrients and vital plant compounds scientists have yet to discover.