CD274 and neoplasm: In contrast, animals injected with a 1:1 ratio of B16/F10scramble to B16/F10PDL1−/− cells developed tumors which were capable of expressing PDL1 on 46% of their tumor cells, while animals injected with a 1:9 ratio developed tumors capable of expressing PDL1 on 4.9% of their tumor cells(Fig. 1b).