MKI67 and neoplasm: The median OS was determined to be lower in patients at the age of 65 years and above, in tumors located in the right lung, in patients with T4 tumor, with N2-3 disease, in patients in the metastatic stage at the diagnosis, with a Ki-67 index of 65% and above, in patients who did not receive chemotherapy, and with a comorbid disease (p>0.05) (Table 2).