We screened tumor-containing tissue sections from 18 devils via IHC that were either naturally infected (n = 12) or experimentally inoculated (n = 5) with tumors as part of a different study (1) and found that PD-L1 was generally not expressed in DFT1 (Figure 8) or DFT2 (Figure 9) cells except for a few sporadic cells. This evidence concerns the gene CD274 and neoplasm.