Synthesis of Auger Electron-Emitting Radiopharmaceuticals

Targeted radiotherapy using Auger electron-emitting pharmaceuticals offers both advantages and challenges compared to alternative alpha - or beta -emitting agents. The low energy Auger electrons deposit their energy within the target cell thereby minimizing collateral damage. To achieve this effect, however, the radiopharmaceutical must incorporate the appropriate radionuclide, be efficiently synthesized, and once administered, be distributed selectively to its biological target. This review covers the synthesis of agents which have prepared over the past decade either as Auger electron-emitting radiopharmaceuticals or which have the potential as such. While not an exhaustive review, the major classes of agents, such as hormone receptor ligands, nucleoside analogs and intercalating agents are described.