CSF3 and acute myeloid leukemia: Most patients with acute myeloid leukemia are in serious condition and have a dangerous prognosis and high mortality rate.3,4 CAG regimen (cytarabine + aclacinomycin + granulocyte colony stimulating factor) is the main chemotherapeutic regimen for acute myeloid leukemia, which has been widely used in clinic, but its effect is not very satisfactory, which is mainly because of the weak body function, poor tolerance and decline of hematopoietic function of bone marrow in elderly patients.5,6