Tumors with 9p21 deletions and loss of MTAP expression were further characterized by low numbers of PD‐L1‐positive tumor cells (p < 0.0001 each) and macrophages (p = 0.0020 for MTA IHC; p < 0.0001 for 9p21 FISH; Table 5). Here, CD274 is linked to neoplasm.