The claim that “Shiitake mushrooms are successful in fighting cancer” is unscientific. Shiitake mushrooms are a common food, which has no therapeutic effect on the human body, so they do not have anti-cancer effects. Cancer usually refers to malignant tumors originating from epithelial tissues, and is the most common among malignant tumors. The occurrence of cancer is closely related to smoking, occupational exposure, environmental pollution, genetic factors and irrational diet. As a common food, shiitake mushroom does not belong to the category of medicine and food, so it has only nutritional value for human body, but no clear anti-cancer effect. The main nutrients in shiitake include carbohydrates, crude fiber, pantothenic acid and vitamin B6. Therefore, moderate consumption of shiitake mushrooms can provide energy and nutrients to cancer patients. If you are diagnosed with cancer, it is recommended that you go to a regular hospital as soon as possible for standardized treatment under the guidance of a doctor to avoid delaying your condition.