- Courses 1, 3, and 5: Patients receive cyclophosphamide IV over 30 minutes, doxorubicin hydrochloride IV, and vincristine IV on day 1; oral prednisone once daily on days 1-5; and denileukin diftitox IV over 60 minutes on days 1 and 2. Treatment repeats every 21 days for 3 courses in the absence of disease progression or unacceptable toxicity.