A ki67 of 80% indicates a high proliferative activity of tumor cells. Ki-67 of 80% refers to the proliferative activity of tumor cells, Ki-67 is the cell proliferation index, and 80% refers to the prognostic index, which represents the splitting index of tumor cells above 80%, suggesting that the proliferative activity of tumor cells is very high, and the tumor deterioration is high, and it is very likely to recur, metastasize, and has a poor prognosis. This index is one of the deciding conditions for chemotherapy, but it also needs to be combined with other pathological examination results and immunocombination results, etc. to decide the treatment plan. For example, the adjuvant treatment of breast cancer and lung cancer after surgery mainly also depends on the stage and size of the tumor, the absence of vascular cancer embolism, nerve invasion, etc., to decide whether the treatment plan is chemotherapy or radiotherapy. If this indicator appears in patients with advanced malignant tumors, systemic chemotherapy, targeted therapy, immunotherapy, etc. should be given to actively fight against cancer and control the development of the disease.