The indications for chemotherapy are also the indications for cancer chemotherapy, which are clinically classified as follows: 1. malignant tumors of the hematopoietic system, such as malignant lymphoma, leukemia, etc. 2. solid tumors with good chemotherapeutic effect, such as skin cancer, seminoma, small cell lung cancer, ovarian cancer, etc. 3. solid tumors with extensive metastases that are not suitable for surgical resection or radiotherapy. 4. solid tumors that have recurred and spread after surgery or radiotherapy. 5. The treatment of recurrence and dissemination of solid tumor after surgery or radiotherapy. 6. Chemotherapy for sensitization before radiotherapy. 7. Chemotherapy to shrink tumor for excellent surgery. 8. Cancerous effusion, such as cancerous pleural effusion and cancerous peritoneal effusion. 9. Superior vena cava compression syndrome caused by tumor is also an indication for chemotherapy.