A long-acting recombinant fusion protein incorporating human serum albumin (HSA)-derived and human granulocyte colony stimulating factor (G-CSF)-derived moieties with potential granulopoietic activity. G-CSF, a naturally occurring cytokine, stimulates the production of granulocytes and stem cells in the bone marrow and their release into the blood; it also stimulates the differentiation, function, and survival of neutrophil precursors and mature neutrophils. Albumin fusion may promote an increased serum half-life and bioavailability of the G-CSF moiety of this fusion protein. Check for active clinical trialsusing this agent.