However, the profile of expressed cytokine receptors differs between patients, and monocytic AML cells seem to express significantly higher levels of receptors for the hematopoietic growth factors GM-CSF (granulocyte-macrophage colony-stimulating factor) and Flt3 ligand and lower levels of SCF (stem cell factor) receptors [48]. This evidence concerns the gene CSF2 and acute myeloid leukemia.