Metcalf studied medicine at the
University of Sydney, and had his first experience of medical research in the laboratory of Professor Patrick de Burgh. In 1954 Metcalf was awarded a Carden Fellowship from the
Anti-Cancer Council of Victoria at the
Walter and Eliza Hall Institute of Medical Research. There he initially studied
virology and
leukemia, later transitioning to
hematology. Metcalf's pioneering research revealed the control of
blood cell formation and the role of hematopoietic
cytokines. In the 1960s he developed techniques to culture blood cells, which led to the discovery of
colony-stimulating factors (CSFs), including
macrophage colony-stimulating factor,
granulocyte colony-stimulating factor and
granulocyte macrophage colony-stimulating factor. CSFs are
cytokines that control
white blood cell formation and are responsible for resistance to infection. CSFs are now widely used to boost the immune system for patients receiving chemotherapy, and to mobilise blood stem cells for transplants. ==Awards and honours==