CA in medical terms is an abbreviation of the English word cancer, which means cancer. In clinical practice, the writing of breast CA or colon CA, etc. refers to breast cancer and colon cancer. Generally speaking, if a malignant tumor, especially a cancer, is not fully diagnosed, it can only be called cancer if there is an occupying sign or a lump in a certain area, and then further pathological examination is taken to confirm the diagnosis of cancer cells. Sometimes abbreviated as CA, cancer is a generic term for a large group of malignant tumors, which may occur in various parts of the body. Those that can be treated surgically are relatively early or intermediate stage tumors. The survival period can be prolonged through a combination of radical surgery followed by adjuvant radiotherapy and chemotherapy.