CD274 and neoplasm: Moreover, we detected anti-programmed death ligand 1 (PD-L1) expression in TIICs of the tissues in almost all patients (88/89, 98.9%), while PD-L1 expression in tumour cells (TCs) was observed in a limited number of cases (6/89, 6.7%) (Table 2 and Supplementary Table 1).