Clinical evidence of efficient tumor targeting based on single-chain Fv antibody selected from a combinatorial library

Nat Med. 1996 Sep;2(9):979-84. doi: 10.1038/nm0996-979.


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.

Publication types

  • Clinical Trial
  • Clinical Trial, Phase I
  • Clinical Trial, Phase II
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Antibodies, Neoplasm / genetics
  • Antibodies, Neoplasm / immunology
  • Antibodies, Neoplasm / metabolism*
  • Breast Neoplasms / metabolism*
  • Carcinoembryonic Antigen / immunology*
  • Colorectal Neoplasms / metabolism*
  • Drug Delivery Systems
  • Humans
  • Immunoglobulin Fragments / genetics
  • Immunoglobulin Fragments / immunology
  • Immunoglobulin Fragments / metabolism*
  • Middle Aged
  • Recombinant Proteins / genetics
  • Recombinant Proteins / immunology
  • Recombinant Proteins / metabolism
  • Tomography Scanners, X-Ray Computed


  • Antibodies, Neoplasm
  • Carcinoembryonic Antigen
  • Immunoglobulin Fragments
  • Recombinant Proteins
  • immunoglobulin Fv