Tumors can be divided into benign tumors and malignant tumors. The former grows slowly, has clear boundaries with surrounding tissues, does not transfer, and poses little harm to human health. The latter grows rapidly, transfers to other parts, produces harmful substances, destroys normal organ structure, makes the body dysfunctional, and threatens life. Malignant tumors, also called cancers, are currently the most serious type of diseases that endanger human health. In the United States, the mortality rate of malignant tumors is second only to cardiovascular diseases. The most common and severely harmful tumors in China are lung cancer, nasopharyngeal cancer, esophageal cancer, gastric cancer, colorectal cancer, liver cancer, breast cancer, cervical cancer, leukemia and lymphoma.
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