OUTLINE: Randomized study. The following acronyms are used: CHOP CTX/DOX/VCR/PRDL CTX Cyclophosphamide, NSC-26271 DHAD Mitoxantrone, NSC-301739 DOX Doxorubicin, NSC-123127 MCOP DHAD/CTX/VCR/PRDL PRDL Prednisolone, NSC-9900 VCR Vincristine, NSC-67574 Arm I: 4-Drug Combination Chemotherapy. CHOP. Arm II: 4-Drug Combination Chemotherapy. MCOP.