Exploring Structural Parameters for Pretargeting Radioligand Optimization

J Med Chem. 2017 Oct 12;60(19):8201-8217. doi: 10.1021/acs.jmedchem.7b01108. Epub 2017 Sep 20.


Pretargeting offers a way to enhance target specificity while reducing off-target radiation dose to healthy tissue during payload delivery. We recently reported the development of an 18F-based pretargeting strategy predicated on the inverse electron demand Diels-Alder reaction as well as the use of this approach to visualize pancreatic tumor tissue in vivo as early as 1 h postinjection. Herein, we report a comprehensive structure: pharmacokinetic relationship study of a library of 25 novel radioligands that aims to identify radiotracers with optimal pharmacokinetic and dosimetric properties. This investigation revealed key relationships between molecular structure and in vivo behavior and produced two lead candidates exhibiting rapid tumor targeting with high target-to-background activity concentration ratios at early time points. We believe this knowledge to be of high value for the design and clinical translation of next-generation pretargeting agents for the diagnosis and treatment of disease.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Drug Discovery
  • Fluorine Radioisotopes
  • Humans
  • Neoplasms / diagnostic imaging*
  • Neoplasms / radiotherapy*
  • Positron-Emission Tomography
  • Radiometry
  • Radiopharmaceuticals / chemistry*
  • Radiopharmaceuticals / pharmacokinetics
  • Radiopharmaceuticals / pharmacology*
  • Rats
  • Small Molecule Libraries
  • Structure-Activity Relationship
  • Xenograft Model Antitumor Assays


  • Fluorine Radioisotopes
  • Radiopharmaceuticals
  • Small Molecule Libraries