OUTLINE: This is a prospective, multicenter study. Patients are stratified according to risk category (low-risk vs high-risk). Patients with low-risk disease receive 3 courses of R-CODOX-M chemotherapy as described below. Patients with high-risk disease receive 4 alternating courses of R-CODOX-M/IVAC chemotherapy as described below in an A/B/A/B sequence.* Courses repeat every 21-28 days in the absence of disease progression or unacceptable toxicity.