Malignant tumors are the leading cause of death in the world. In 2007, there were 11.3 million new malignant tumors and 7.9 million deaths worldwide, accounting for about 13% of the global deaths, of which about 72% of malignant tumor deaths occurred in low-and middle-income countries. The causes of death of malignant tumors in the world are lung cancer, gastric cancer, liver cancer, colorectal cancer, esophageal cancer and prostate cancer in the order of men; Women are breast cancer, lung cancer, stomach cancer, colorectal cancer, and cervical cancer in order. If necessary action is not taken, there will be 15.5 million new cases of malignant tumors and 11.5 million deaths by 2030[1]。