Cancer is a generic term for malignant tumor, which is a major clinical threat to health. The gold standard for cancer diagnosis is pathological histology. CT, MRI, tumor markers, PET-CT and other tests are only indicators to assist in the diagnosis of cancer, but not to confirm the final diagnosis. Only after the diagnosis is confirmed can the patient be given effective cancer treatment based on the nature of the mass, the patient’s physical condition and the patient’s clinical stage, etc. Currently, the main treatment methods for cancer are surgery, radiotherapy, chemotherapy, targeted therapy and immunotherapy, etc.