If the patients who are at a high risk for FN can be distinguished appropriately before chemotherapy, efficient prevention of FN-induced serious infections can be feasible by precluding FN development via the administration of highly selective, prophylactic granulocyte colony-stimulating factor (G-CSF) to those at high risk for FN, as well as by avoiding unnecessary prescription of costly G-CSF and antibiotics to those at low risk for FN [4, 6, 7]. Here, CSF3 is linked to infection.