PRIOR CONCURRENT THERAPY: Biologic therapy: No prior radioimmunotherapy AND high dose chemotherapy Chemotherapy: No prior high dose chemotherapy AND radioimmunotherapy At least 4 weeks since other prior chemotherapy and recovered Endocrine therapy: At least 2 weeks since prior corticosteroids and recovered Radiotherapy: No prior radioimmunotherapy AND high dose chemotherapy At least 4 weeks since prior radiotherapy to index lesion No prior radiotherapy to greater than 25% of any critical organ (e.g., lung, liver, kidneys) No prior total body irradiation Surgery: At least 4 weeks since prior major surgery