it depends stage of your cancer, if its under stage 3 which is 1 and 2 you could take herbs.
do a healthy diet. Avoid red meat (beef, goat, pork), replace cow milk with soy milk, multiply eating oat grain and tuber crops. do not eat seafood except salmon, tuna, or mackerel. eat lots of green vegetables and spices such as ginger, garlic, onion, turmeric.
Treatment will be useless if you do not maintain your diet.