Tumor Biology

, Volume 33, Issue 3, pp 591–600 | Cite as

Pretargeting: taking an alternate route for localizing radionuclides

  • Robert M. Sharkey
  • Chien-Hsing Chang
  • Edmund A. Rossi
  • William J. McBride
  • David M. Goldenberg
Research Article


Bispecific antibody pretargeting is a two-step procedure for selectively delivering radionuclides to tumors. The procedure was developed to solve a number of problems encountered when radionuclides are directly coupled to an IgG, such as slow blood clearance and delayed tumor accretion. While various forms of antibody fragments can reduce blood pool activity and provide faster tumor localization, tumor uptake is reduced considerably. In pretargeting procedures, the radionuclide is attached to a small molecule that quickly traverses the vascular barrier to reach the tumor cells, achieving maximum accretion within 0.5 to 1.0 h. Just as quickly, it is eliminated from the body, thereby minimizing tissue exposure and developing high tumor/tissue ratios very early. In order to capture the radionuclide in the tumor, a bispecific antibody (bsMAb) that binds to the tumor and to the isotope carrier (e.g., a hapten-peptide) is pre-administered some time earlier. The pretargeting procedure has been shown repeatedly to improve tumor localization as compared to directly radiolabeled antibodies, thereby enhancing both imaging and therapy. In this article, we review the progress our group has made toward developing and testing bsMAb pretargeting systems for cancer detection and therapy.


Bispecific antibody Cancer detection Cancer therapy Pretargeting Radioimmunodetection Radioimmunotherapy 



We thank Dr. Habibe Karacay, Dr. Jacques Barbet, Prof Otto Boerman, Dr. Shankar Vallabhajosula, and Dr. Pat Zanzonico for their assistance in the preclinical studies.

Conflict of interest

C-H Chang, EA Rossi, WJ McBride, and DM Goldenberg are employed or have financial interests in IBC Pharmaceuticals, Inc., and/or Immunomedics, Inc. RM Sharkey has no disclosure.


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Copyright information

© International Society of Oncology and BioMarkers (ISOBM) 2012

Authors and Affiliations

  • Robert M. Sharkey
    • 1
  • Chien-Hsing Chang
    • 2
  • Edmund A. Rossi
    • 3
  • William J. McBride
    • 2
  • David M. Goldenberg
    • 1
  1. 1.Garden State Cancer Center at the Center for Molecular Medicine and ImmunologyMorris PlainsUSA
  2. 2.Immunomedics, Inc.Morris PlainsUSA
  3. 3.IBC Pharmaceuticals, Inc. and Immunomedics, Inc.Morris PlainsUSA

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