A biologic therapy that acts as a colony-stimulating factor, a substance made in the body that helps the bone marrow make white blood cells. Colony-stimulating factors may be given after chemotherapy to help prevent infections. They may also be used after bone marrow and stem cell transplantation to help bone marrow recover.

Brand name, Leukine. A drug used to treat neutropenic patients (those with a decreased white blood cell count).

A colony-stimulating factor that stimulates the production of white blood cells, especially granulocytes and macrophages, and cells (in the bone marrow) that are precursors of platelets. It is a cytokine that belongs to the family of drugs called hematopoietic (blood-forming) agents. Also called granulocyte-macrophage colony-stimulating factor (GM-CSF).