To analyze the tumor homing and in vivo survival ability, DXM/lactoferrin PMN-MDSCs, Con PMN-MDSCs, and tumor PMN-MDSCs were labeled with CFSE (2 μM; Fig. S8) and injected intravenously (i.v.)into B16 tumor-bearing mice, when the tumors were between 0.9 and 1.1 cm in diameter. The gene discussed is LTF; the disease is neoplasm.