<qa>  What is the name of the type of chemotherapy that patients receive on day 1?- Arm I closed to accrual as of 7252005: Patients receive standard CHOP chemotherapy comprising cyclophosphamide IV, doxorubicin IV, and vincristine IV on day 1 and oral prednisone on days 1-5. Patients also receive filgrastim G-CSF subcutaneously once daily on days 6-12 of each CHOP course. Treatment repeats every 2 weeks for 6 courses. 