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purpose: A prospective, randomized study was conducted to determine if recombinant human granulocyte-macrophage colony-stimulating factor (rh-GMCSF) (Escherichia coli-derived) could improve response rates to antibiotic therapy and shorten the duration of neutropenia in cancer patients. patients and methods: A total of 107 febrile neutropenic cancer patients were randomly assigned to empiric therapy with ticarcillin-clavulanate (4 g ticarcillin + 0.1 g clavulanate IV every 4 hours) plus netilmicin (2 mg/kg IV every 8 hours) with or without rh-GMCSF (3 μg/kg per day IV). Clinical improvement, duration of neutropenia, and toxicity were monitored. results: Addition of rh-GMCSF to the antibiotics significantly improved the response rate (96% versus 82%, P = 0.03), but not the survival rate (93% versus 93%), in the evaluable patients. This difference in response rate was not significant when considering all patients in …