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Evaluation of a freeze-dried kit for EDTMP-based bone-seeking radiopharmaceuticals

Evaluation of a freeze-dried kit for EDTMP-based bone-seeking radiopharmaceuticals

Applied Radiation and Isotopes 58(4): 481-488

A freeze-dried kit developed for formulation of ethylenediamine-tetramethylenephosphonic acid (EDTMP) chelates with "pain-palliation" radiolanthanides (e.g., 153Sm and 177Lu) or "diagnostic" 99mTc has been evaluated, meeting quality and safety criteria required for medicinal use. The EDTMP kit enables an instant one-step preparation of a radiopharmaceutical of high radiochemical purity (>99%) and has a sufficiently long shelf life. Comparative biodistribution studies of 177Lu-EDTMP and 99mTc-EDTMP prepared from the kit revealed similar tissue uptake and clearance to those obtained for pre-formulated 153Sm-EDTMP. The most significant difference was observed for 99mTc-EDTMP, which shows a high retention in kidney, reaching ca. 2% ID after 90min p.i.v.Although preliminary clinical evaluations suggest that 99mTc-EDTMP possesses limited value for bone scintigraphy, application of the radiopharmaceutical for specific diagnostic purposes may still be considered, e.g., investigation of bone metastases or ossification processes in inflammatory spondyloarthropathy.

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Accession: 048993433

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PMID: 12672628

DOI: 10.1016/s0969-8043(03)00057-5

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