Tumors can occur in any part of the human body and in almost any tissue. According to the different tissues from which malignant tumors originate, malignant tumors that grow from epithelial (epidermal) tissues such as the skin and mucous membranes of the internal organs are called carcinomas, for example, gastric cancer, hepatocellular carcinoma, lung cancer, esophageal cancer, uterine cervix cancer, breast cancer, colon cancer, rectal cancer, nasopharyngeal carcinoma, ovarian cancer, renal carcinoma, bladder carcinoma, thyroid carcinoma, and skin carcinoma, and so on. Any malignant tumor that grows out of mesenchymal tissues such as muscle, fat, bone, blood vessels, lymph, etc. is called sarcoma, for example, rhabdomyosarcoma, smooth muscle sarcoma, fibrosarcoma, liposarcoma, osteosarcoma, chondrosarcoma, hemangiosarcoma, lymphangiosarcoma, and so on. There are also malignant tumors that have other names for certain historical reasons, such as leukemia, Hodgkin's disease, Wilm's tumor (nephroblastoma), melanoma, retinoblastoma, spermatocytoma, granulosa cell tumors, Kugenberg's tumors, Ewing's tumors, malignant vascular endothelial cell tumors, and Paget's disease of the breast. Since cancer is far more common than sarcoma (and other malignant tumors), it is about 9:1, which means that out of 10 patients with malignant tumors, 9 patients are suffering from cancer and 1 patient is suffering from sarcoma. Therefore, malignant tumors are generally referred to as cancer. There are more than 100 kinds of human cancers, and the highest incidence in our country is digestive tract cancers and respiratory tract cancers, such as stomach cancer, liver cancer, lung cancer, esophageal cancer, colorectal cancer, etc.