Abstract
Promethium-149 ( 149Pm) is one of only three radiolanthanides that can be prepared in no carrier added concentrations. This high specific activity radiolanthanide is thus suitable for targeting limited numbers of specific receptors found on many tumor cells. Promethium-149 is a moderate energy β - emitter (1.07 MeV (95.9%)) with a half-life of 2.21 days. Pm-149 also emits a low abundance of an imageable γ ray (286 keV (3%)) that may allow in vivo tracking of the therapeutic dose. The 149Pm and Sm complexes with the DO3A-amide chelator with zero and three carbon spacers to the bombesin peptide analog BBN(7–14)NH 2 were synthesized and characterized. The Sm complexes were synthesized for macroscopic characterization purposes (ESI-MS, in vitro cell binding) since no stable isotopes of Pm are known. The biological properties of the 149Pm, 153Sm and 177Lu-DO3A-amide-βAla-BBN complexes were compared in normal mouse biodistribution studies.
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