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    Complexation studies of 177Lu with ethylenediaminetetramethylene phosphonic acid (EDTMP) as a bone pain palliative therapeutic radiopharmaceutical

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    Date
    2016
    Author
    Sepini, Lebogang
    Zeevaart, Jan Rijn
    Jansen, David
    Jarvis, Neil
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    Abstract
    Therapeutic radiopharmaceuticals for bone pain palliation play an important role in providing quality of life for cancer patients with metastatic bone cancer. There is currently interest in using 177Lu in many radiopharmaceuticals, since 177Lu has favorable nuclear decay characteristics. The usefulness of 177Lu complexed to ethylenediaminetetramethylene phosphonic acid (EDTMP) has been demonstrated in clinical trials. This study seeks to understand the in vivo chemistry of the [177Lu]Lu–EDTMP complex in blood plasma. Complex formation constants of Lu(III) and Yb(III) were measured by glass electrode potentiometry at 25 °C and I = 150 mM. The computer simulations indicated that [Lu(EDTMP)]5− and [Lu(EDTMP)H]4− are the major Lu(III) complexes formed in blood plasma. These results explains why [177Lu]Lu–EDTMP survives competition by other blood plasma metal ions and is delivered to the metastases. A thermodynamic blood plasma simulation revealed that Lu(III) is practically quantitatively complexed to EDTMP in vivo
    URI
    http://hdl.handle.net/10394/21368
    https://www.sciencedirect.com/science/article/pii/S0277538715007949
    https://doi.org/10.1016/j.poly.2015.12.044
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