- Patients receive the CODOX-M chemotherapy regimen (as above) alternating with the IVAC chemotherapy regimen (as defined below) for a total of 4 courses given in the following sequence: CODOX-M, IVAC, CODOX-M, and IVAC. The IVAC chemotherapy regimen comprises ifosfamide (IFF) IV over 1 hour and etoposide IV over 1 hour on days 1-5 and ARA-C IV over 3 hours on days 1 and 2. Patients over age 65 receive reduced-dose IFF and ARA-C. Patients also receive G-CSF SC once daily beginning on day 7 and continuing until blood counts recover.