title: Production, biodistribution assessment and dosimetric evaluation of (177)Lu-TTHMP as an agent for bone pain palliation.
abstract: OBJECTIVE
  Recently, bone-avid radiopharmaceuticals have been shown to have potential benefits for the treatment of widespread bone metastases. Although (177)Lu-triethylene tetramine hexa methylene phosphonic acid (abbreviated as (177)Lu-TTHMP), as an agent for bone pain palliation, has been evaluated in previous studies, there are large discrepancies between the obtained results. In this study, production, quality control, biodistribution, and dose evaluation of (177)Lu-TTHMP have been investigated and compared with the previously reported data.
  
  
  METHODS
  TTHMP was synthesized and characterized, using spectroscopic methods. Radiochemical purity of the (177)Lu-TTHMP complex was determined using instant thin-layer chromatography (ITLC) and high performance liquid chromatography (HPLC) methods. The complex was injected to wild-type rats and biodistribution was studied for 7 days. Preliminary dose evaluation was investigated based on biodistribution data in rats.
  
  
  RESULTS
  (177)Lu was prepared with 2.6-3 GBq/mg specific activity and radionuclide purity of 99.98%. (177)Lu-TTHMP was successfully prepared with high radiochemical purity (>99%). The complex showed rapid bone uptake, while accumulation in other organs was insignificant. Dosimetric results showed that all tissues received almost insignificant absorbed doses in comparison with bone tissues.
  
  
  CONCLUSIONS
  Based on the obtained results, this radiopharmaceutical can be a good candidate for bone pain palliation therapy in skeletal metastases.
authors.affiliation: Nuclear Science and Technology Research Institute (NSTRI), Tehran, Iran.
authors.forename: Samaneh
authors.initials: S
authors.lastname: Zolghadri
authors.affiliation: Nuclear Science and Technology Research Institute (NSTRI), Tehran, Iran.
authors.forename: Hassan
authors.initials: H
authors.lastname: Yousefnia
authors.affiliation: Nuclear Science and Technology Research Institute (NSTRI), Tehran, Iran.
authors.forename: Amir Reza
authors.initials: AR
authors.lastname: Jalilian
authors.affiliation: Nuclear Science and Technology Research Institute (NSTRI), Tehran, Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Ghannadi-Maragheh
keywords: Bone pain palliation; Dosimetry; Lu-177; TTHMP