Macrophage colony-stimulating factor (M-CSF) is a homodimeric glycoprotein which stimulates differentiation of progenitor cells to mature monocytes and enhances production of hemopoietic growth factors from mature monocytes such as granulocyte-macrophage CSF, granulocyte CSF and megakaryocyte potentiator, suggesting that M-CSF administration enhances production of monocytes, neutrophils and platelets. Since the commercial availability of M-CSF in 1991, serial M-CSF infusions at a daily dose of 8 million units have been performed in patients with acute myeloid leukemia in complete remission after combination chemotherapy. Although M-CSF infusion reduced the duration of neutropenia in 3 of 5 patients, it reduced the duration of pyrexia over 37°C in all patients, and that over 38°C in 4 of 5 patients. Average durations of pyrexia and parenteral antibiotic injections were significantly shorter in M-CSF than in control courses. Although M-CSF infusion reduced the duration of thrombopenia in 2 of 5 patients, it reduced total platelet units transfused in 4 of 5 patients. The average number of platelet units transfused after combination chemotherapy was significantly lower in M-CSF than in
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