title: Clinical evidence of efficient tumor targeting based on single-chain Fv antibody selected from a combinatorial library.
abstract: We present a system for cancer targeting based on single-chain Fv (scFv) antibodies selected from combinatorial libraries, produced in bacteria and purified by using an engineered tag. Combinatorial libraries of scFv genes contain great diversity, and scFv antibodies with characteristics optimized for a particular task can be selected from them using filamentous bacteriophage. We illustrate the benefits of this system by imaging patients with carcinoembryonic antigen (CEA)-producing cancers using an iodine-123 labeled scFv anti-CEA selected for high affinity. All known tumor deposits were located, and advantages over current imaging technology are illustrated. ScFvs are produced in a cloned form and can be readily engineered to have localizing and therapeutic functions that will be applicable in cancer and other diseases.
authors.affiliation: Department of Clinical Oncology, Royal Free Hospital, School of Medicine, London, UK.
authors.forename: R H
authors.initials: RH
authors.lastname: Begent
authors.forename: M J
authors.initials: MJ
authors.lastname: Verhaar
authors.forename: K A
authors.initials: KA
authors.lastname: Chester
authors.forename: J L
authors.initials: JL
authors.lastname: Casey
authors.forename: A J
authors.initials: AJ
authors.lastname: Green
authors.forename: M P
authors.initials: MP
authors.lastname: Napier
authors.forename: L D
authors.initials: LD
authors.lastname: Hope-Stone
authors.forename: N
authors.initials: N
authors.lastname: Cushen
authors.forename: P A
authors.initials: PA
authors.lastname: Keep
authors.forename: C J
authors.initials: CJ
authors.lastname: Johnson
authors.forename: R E
authors.initials: RE
authors.lastname: Hawkins
authors.forename: A J
authors.initials: AJ
authors.lastname: Hilson
authors.forename: L
authors.initials: L
authors.lastname: Robson
mesh_terms: D000328:Adult; D000368:Aged; D000912:Antibodies, Neoplasm / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D001943:Breast Neoplasms / Q000378:metabolism*; D002272:Carcinoembryonic Antigen / Q000276:immunology*; D015179:Colorectal Neoplasms / Q000378:metabolism*; D016503:Drug Delivery Systems; D006801:Humans; D007128:Immunoglobulin Fragments / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D008875:Middle Aged; D011994:Recombinant Proteins / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D015898:Tomography Scanners, X-Ray Computed
chemical_list: D000912:Antibodies, Neoplasm; D002272:Carcinoembryonic Antigen; D007128:Immunoglobulin Fragments; D011994:Recombinant Proteins; C055966:immunoglobulin Fv