PDCD1 and neoplasm: Similarly, CD24 / sialic‐acid‐binding Ig‐like lectin 10 (Siglec‐10) axis and programmed cell death protein 1 (PD‐1) / programmed death ligand‐1 (PD‐L1) axis also attenuate phagocytosis of macrophages and promote tumor cell escape.29, 30