granulocyte colony-stimulating factor (G-CSF)

A substance that stimulates the bone marrow to develop granulocytes (a type of white blood cell). Granulocytes help defend the body against bacteria, viruses and types of fungus.

G-CSF is a cytokine found naturally in the body. It can also be made in a lab.

G-CSF is a type of biological therapy used in cancer treatment to lower the risk of infection and the need for antibiotics.