CD274 and neoplasm: identified a subgroup of Chemokine (C‐X‐C motif) ligand (Cxcl) 10‐producing CNS‐resident macrophages that can recruit immunoregulatory VISTA+PD‐L1 (programmed cell death ligand 1)‐resident TAMs, thereby promoting tumor evasion in patients with brain metastases [164].