PRIOR CONCURRENT THERAPY: Biologic therapy: At least 4 weeks since prior immunotherapy No prior murine, chimeric or humanized antibody and/or antibody fragment Chemotherapy: See Disease Characteristics At least 4 weeks since prior chemotherapy (6 weeks for nitrosoureas and mitomycin) Endocrine therapy: No concurrent systemic corticosteroids (except for acute management of allergic-type events) No concurrent immunosuppressive agents Radiotherapy: See Disease Characteristics Surgery: See Disease Characteristics Recovered from surgery Other: At least 4 weeks since other prior investigational agents