Lutetium-177-EDTMP / Bone metastasis / Pain palliation / Radionuclide therapy / Therapeutic radiopharmaceuticalSummary. Beta emitting radionuclides have demonstrated excellent properties for radionuclide endotherapy using appropriate carrier molecules. In an effort to search for alternative radionuclides, the preparation of 177 Lu-EDTMP was undertaken, as a palliative agent for bone metastasis. Natural Lu 2 O 3 was irradiated at the RA-3 Nuclear Reactor of the Ezeiza Atomic Center (Argentina). The optimum molar ratio of Lu:EDTMP, the radiochemical purity, the in vivo and in vitro stability and the biological behaviour in Wistar rats and New Zealand rabbits were studied. The results indicate that an excellent alternative therapeutic radiopharmaceutical, with comparable characteristics as its 153 Sm-EDTMP counterpart, was successfully achieved.
This paper summarizes the development and preparation procedures for two particulate preparations of 153Sm, namely the hydroxyapatite (HA) particles and human serum albumin (HSA) microspheres. Preparation of 153Sm-labeled hydroxyapatite particles and 153Sm-labeled albumin microspheres were done in two steps. Radiolabeling efficiency was greater than 95% for hydroxyapatite particles and greater than 80% for albumin microspheres.
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