CD274 and neoplasm: We found that while there were similar frequencies of the monocyte (CD11b+) populations in both tumor models (Supplemental Figure 3B and not shown), CD11b+ cells in both 66cl4 and E0771 tumors implanted during mammary gland involution had higher average levels of PD-L1 (Figures 1H,I and Supplemental Figure 3C).