Tumor biopsy is a CT-guided puncture biopsy of the found mass, such as superficial lymph nodes, soft tissue mass in the skin, or occupying lesions in the lungs, or the lymph nodes will be completely stripped off and then submitted to the Department of Pathology for pathologic tissue biopsy. The purpose of the biopsy is to determine whether the soft tissue mass is malignant or not, the extent of tumor invasion, and whether it is combined with a gene mutation. At present, targeted drug therapy under the guidance of gene mutation is a very important therapeutic means for the treatment of tumor. Take lung cancer as an example, if there is EGFR gene mutation, targeted drugs such as gefitinib can be used, and if there is ALK gene mutation, targeted drugs such as crizotinib can be used. In breast cancer, targeted drugs such as trastuzumab can also be used to target the high expression of targeted drugs, so tumor biopsy is a key measure in the first step of clinical diagnosis of tumors.