Cancer, also known as malignant tumor, has the characteristic of unlimited growth and is not controlled by the body. Since it has unrestricted growth, it requires nutrients from the body and is locally invasive and distantly metastatic. Local invasiveness can cause damage to the surrounding organs, resulting in impaired function of the surrounding organs. Distant metastasis, such as liver metastasis, has the characteristic of unlimited growth, and then it will attack the function of normal liver, leading to liver failure and death. Cancer has the characteristic of unlimited growth and thus draws nutrients from the human body. The unlimited drawing of nutrients from the human body will produce unlimited consumption of the human body and lead to the death of the human body.