OUTLINE: This is an open-label, randomized, multicenter study. Patients are stratified according to study center, serum lactic dehydrogenase level (≤ upper limit of normal [ULN] vs > ULN), disease stage (I or II vs III or IV), ECOG performance status (0-1 vs 2-3), bulky disease, and extranodal involvement. Patients with initial bulky disease and/or qualifying extranodal involvement are randomized to 1 of 4 treatment arms. Patients with non-bulky disease are randomized to treatment arms I or III.