The impact of EBV infection and PD-L1 expression in GaC is also appreciated in another series of EBV-positive cases (n = 43), in which formalin-fixed paraffin-embedded (FFPE) tumor specimens were subjected to the estimation of the EBV copy number (EBV-CN) by qPCR. Here, CD274 is linked to Epstein-Barr virus infection.