If you are found to be eligible to take part in this study, you will receive 2 kinds of intensive chemotherapy regimens (hyper-CVAD therapy and methotrexate plus Ara-C) that will alternate for a total of 8 courses (4 courses each). One (1) course of therapy is between 21 and 28 days. All chemotherapy will be given through a large vein by a central venous catheter. A central venous catheter is a sterile flexible tube that will be placed into a large vein while you are under local anesthesia. Your doctor will explain this procedure to you in more detail, and you will be required to sign a separate consent form for this procedure.