PRIOR CONCURRENT THERAPY: Biologic therapy: No prior murine monoclonal antibodies Chemotherapy: See Disease Characteristics At least 4 weeks since prior platinum based chemotherapy No concurrent chemotherapy Endocrine therapy: Not specified Radiotherapy: At least 6 months since prior limited field (i.e., abdominal or pelvic) radiotherapy No prior whole abdominal radiotherapy Surgery: At least 4 weeks since prior surgery No prior splenectomy Other: At least 4 weeks since prior immunosuppressive drugs No concurrent immunosuppressive drugs At least 30 days since other prior investigational drugs