After lung adenocarcinoma is removed, ki67 also has reference significance. Generally, ki67 is expressed as a percentage, and the higher the index is, the faster the tumor grows and reproduces. After lung adenocarcinoma is surgically resected, ki67 can be used to know the prognosis and treatment of patients, and at the same time, it can also be used to test the condition of the disease and timely detect the recurrence of the disease. Under normal circumstances, ki67 will decrease after lung adenocarcinoma surgery, but if it continues to increase, it indicates recurrence, and it can also understand the malignancy and invasiveness of the tumor, so as to take targeted treatment in time to improve the cure rate and prolong the survival time of the patients. Therefore, no matter before or after surgery, ki67 index is helpful to the condition, and it is recommended to follow the doctor’s instruction to check.