（Stage 1A (malignant) tumors have limited lesions and can be eradicated after surgical resection, so chemotherapy is not necessary and is usually decided in the light of the specific condition. Malignant tumors are common diseases that endanger human life and can be caused by genetic, gene mutation, environmental factors, etc. Stage 1A is one of the clinical stages, which is mostly in the early stage of the disease. For example, stage 1A of cervical cancer is the tumor limited to the uterus, invasive cancer that can only be diagnosed by microscope; no lymph node metastasis; no distant metastasis, while stage IA lung cancer has a tumor diameter of 3cm or less, with no regional lymph node and distant metastasis. In this period, the lesions are limited, and good curative effect can be achieved after radical surgical resection, which does not need to be supplemented by postoperative chemotherapy.