CD274 and colorectal cancer: In another recent study by Weissman's group, it was demonstrated that whereas PD‐1‐deficient macrophages engulf PD‐L1+ and PD‐L1 KO CT26 colorectal cancer cells equally well, PD‐1+ macrophages engulfed PD‐L1 KO tumor cells significantly better that PD‐LI‐expressing tumor cells.53