However, some anti-phagocytic signals also exist on the surface of tumor cells, including CD47, PD-L1, β 2-microglobulin (B2M), an unidentified ligand that binds to leukocyte immunoglobulin-like receptor-2 (LILRB2), and the recently discovered CD24 (6, 92–95). Here, CD24 is linked to neoplasm.