Improved in vivo stability of actinium-225 macrocyclic complexes.


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Field: Medicine  DOWNLOAD  BOOKMARK REPORT
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    		Views: ()   Date: (1999-7-30)   Pages: ()

  • Author:  M W Brechbiel  

  • Abstract:  The favorable nuclear properties of actinium-225 ((225)Ac) have led to proposal of this isotope for use in radioimmunotherapy. In an effort to reduce the toxicity of free (225)Ac, a series of ligands were evaluated for stability in vivo. Loss of (225)Ac from acyclic chelating agents resulted in high liver uptake and poor whole body clearance. The macrocyclic ligands c-DOTA, PEPA, and HEHA were evaluated, and (225)Ac-HEHA showed exceptional stability in vivo. (225)Ac chelated with EDTA, DTPA, DOTA, or PEPA permitted substantial accumulation of the radionuclide to the liver, while the (225)Ac-HEHA complex was essentially excreted within minutes of administration. The preparation of the ligands and radiolabeled complexes and the biodistribution results will be discussed.

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