OUTLINE: This is a dose escalation study of yttrium Y 90 humanized anti-CD22 monoclonal antibody LL2 (Y90 MOAB hLL2). Patients receive filgrastim (G-CSF) subcutaneously daily for 5 days and undergo harvest of peripheral blood stem cells (PBSC) on 2 or more consecutive days. If an adequate number of CD34+ cells are not harvested, autologous bone marrow may be used. Chemotherapy-induced mobilization with filgrastim allowed. Patients undergo pretherapy imaging with indium In 111 humanized LL2 (In111 hLL2) for up to 40 minutes on day -7. Patients receive Y90 MOAB hLL2 for up to 40 minutes on day 0 plus In111 hLL2, followed by Y90 MOAB hLL2 alone on day 3. Patients receive ifosfamide IV over 1 hour, cisplatin IV over 2 hours, and cytarabine IV over 2 hours on days 1 and 4. Oral etoposide is given daily on days 1-7. PBSC or bone marrow is reinfused on days 9-14, depending on MOAB clearance. Cohorts of 3-6 patients receive escalating doses of Y90 MOAB hLL2 until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose preceding that at which 2 of 3 or 2 of 6 patients experience dose limiting toxicity. Patients are followed weekly for 2 months, monthly for 6 months, and then every 6 months for 5 years.