CD274 and neoplasm: Flow cytometry analysis revealed that tumors from the UL23-MFC group had increased PD-L1 fluorescence intensity on the surface of tumor cells (MFI: 3,313 ± 240.5 in UL23-MFC vs. 2,666 ± 154.0 in Ctrl-MFC, P = 0.0468) (Fig. 7C-D).