PRIOR CONCURRENT THERAPY: Biologic therapy: At least 2 months since prior packed red blood cell transfusion No prior murine or human antibody therapy No prior murine protein No other concurrent immunotherapy Chemotherapy: At least 4 weeks since prior chemotherapy and recovered No concurrent chemotherapy Endocrine therapy: See Disease Characteristics Concurrent gonadotropin releasing hormone analogs required for patients who have not undergone surgical orchiectomy No other concurrent hormonal therapy Radiotherapy: See Disease Characteristics At least 4 weeks since prior radiotherapy and recovered No prior diagnostic scintigram (e.g., ProstaScint, Myoscint, or Oncoscint) No prior radiotherapy to more than the sternum alone OR No primary radiotherapy to the prostate and one other site OR No prior radiotherapy to more than 25% of the skeleton No prior treatment with strontium chloride Sr 89 or Samarium Sm 153 lexidronam pentasodium No concurrent radiotherapy to localized sites (e.g.,bone) used as indicator lesions Surgery: No concurrent surgery to sole site of measurable disease Other: At least 4 weeks since investigational anticancer therapeutic drugs and recovered No concurrent aspirin, nonsteroidal antiinflammitory agents, anticoagulants, or other drugs that may induce or exacerbate a bleeding tendency