MKI67 and neoplasm: A total of 32.5% of patients had brain metastasis, and among those who underwent surgery, 90.2% underwent lobectomy, 29.9% of patients received whole brain radiation therapy (WBRT), and 4% received prophylactic cranial irradiation (PCI), positive PD-L1 expression (Tumor Cell Proportion Score (TPS) ≥ 1%) in 18.2% (14/77) of patients, Ki-67 expression was up to 50% and above in 67.5% (52/77) of patients.