PRIOR CONCURRENT THERAPY: Biologic therapy: At least 4 weeks since biologic therapy Chemotherapy: At least 4 weeks since prior chemotherapy and recovered No greater than 240 mg/m2 doxorubicin total for combination therapy with doxorubicin but no greater than 550 mg/m2 doxorubicin if radioimmunotherapy alone No prior failure on doxorubicin therapy for combination therapy but not radioimmunotherapy alone Endocrine therapy: Prior synthroid (T4) allowed Radiotherapy: See Disease Characteristics At least 4 weeks since prior radiotherapy to index lesion and recovered No prior radiotherapy to greater than 35% of red marrow Surgery: At least 4 weeks since prior major surgery