PRIOR CONCURRENT THERAPY: Biologic therapy: At least 4 weeks since prior immunotherapy No prior murine, chimeric, or humanized antibody and/or antibody fragment Chemotherapy: At least 4 weeks since prior chemotherapy Endocrine therapy: No concurrent systemic corticosteroids except for acute management of allergic type events Radiotherapy: See Disease Characteristics Surgery: See Disease Characteristics Recovered from prior surgery Other: At least 4 weeks since other prior investigational agents No concurrent immunosuppressive agents