“…Neutropenia remains the principal factor limiting the use of chemotherapy for the treatment of cancer and a major cause of morbidity following bone marrow transplantation (Pizzo, 1993;Strauss, 1993;. The discovery and clinical development of the colony-stimulating factors, namely granulocyte colony-stimulating factor (G-CSF) and granulocyte-macrophage colony-stimulating factor (GM-CSF), have had a major impact to reduce the duration and severity of neutropenia in these circumstances, but the problem of neutropenia has not been solved (Groopman et al, 1989;Weisbart et al, 1989;Demetri & Griffin, 1991;Lieschke & Burgess, 1992;Dale et al, 1995;Gasson, 1991;Crawford et al, 1991;Gisselbrecht et al, 1994;Gabrilove et al, 1988a, b;Maher et al, 1994;Neumanitis et al, 1991;deVries et al, 1991;Gerhartz et al, 1993;Ozer, 1994). G-CSF and GM-CSF are only effective if the patient has a sufficient population of responsive haemopoietic precursor cells.…”