Hello, cancer patients need surgery or radiotherapy and chemotherapy, and their diet aims at strengthening nutrition and supplementing vitamins. Spinach, leek, celery, shepherd's purse, kohlrabi, cauliflower, Chinese cabbage, lettuce, carrot, cucumber, loofah, bitter gourd, tomato, citrus, hawthorn, apple, apricot, pear, kiwi, watermelon and melon are all foods that help to prevent cancer and are rich in vitamins.