Figure 4

Representative pictures and data of each PD-L1 expression level (0, 1+, 2+ and 3+) (a), immunohistochemical staining for CD8, CD4, Foxp3, and PD-1 (b), four mononucleotide repeat microsatellite targets (BAT26, NR27, NR21 and CAT25) (c) and electrophoresis for EBV (d). The original gel was presented in Supplementary Fig. S3.