Summary Twenty patients with non-Hodgkin's lymphoma were treated with a combination of cyclophosphamide (750 mg m-2, day 1), epidoxorubicin (60 mg m-2, day 1), vincristine (1.4 mg m-2, day 1) and prednisone (100 mg m-2, days 1-5) every 14 days. Shortening of intervals was associated with the prophylactic employment of granulocyte colony-stimulating factor (G-CSF; specifically, filgrastim) administered at a dose of 300 gg subcutaneously from day 6 to day 11. The ratio between actually delivered dose intensity and planned dose intensity was 1.0 in 18 out the 20 patients. Toxicity was acceptable; response rate and survival are in the expected range. The present study demonstrated the feasibility of acceleration of chemotherapy cycles to obtain dose intensification in non-Hodgkin's lymphoma.