CD274 and neoplasm: The subgroup analysis revealed no association between stromal (HR = 0.53; 95% Cl: [0.23, 1.21]; p = 0.13) or tumour (intra-tumour) (HR = 2.24; 95% Cl: [0.83, 6.02]; p = 0.11) expression of PD-L1 and OS in OSCC patients (Figure 5B).