CD274 and neoplasm: Among the 13 patients whose PD-L1 expression was detected, ≥ 50% of tumor cells exhibited PD-L1 expression in were observed in 3 patients (23.0%, 3/13), 5 patients (38.5%, 5/13) with PD-L1 expression 1-49%, while 5 patients (38.5%, 5/13) with PD-L1 expression ≤ 1%.