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Published in: European Journal of Nuclear Medicine and Molecular Imaging 11/2015

Open Access 01-10-2015 | Original Article

DNA damage in blood lymphocytes in patients after 177Lu peptide receptor radionuclide therapy

Authors: Uta Eberlein, Carina Nowak, Christina Bluemel, Andreas Konrad Buck, Rudolf Alexander Werner, Harry Scherthan, Michael Lassmann

Published in: European Journal of Nuclear Medicine and Molecular Imaging | Issue 11/2015

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Abstract

Purpose

The aim of the study was to investigate DNA double strand break (DSB) formation and its correlation with the absorbed dose to the blood lymphocytes of patients undergoing their first peptide receptor radionuclide therapy (PRRT) with 177Lu-labelled DOTATATE/DOTATOC.

Methods

The study group comprised 16 patients receiving their first PRRT. At least six peripheral blood samples were obtained before, and between 0.5 h and 48 h after radionuclide administration. From the time–activity curves of the blood and the whole body, residence times for blood self-irradiation and whole-body irradiation were determined. Peripheral blood lymphocytes were isolated, fixed with ethanol and subjected to immunofluorescence staining for colocalizing γ-H2AX/53BP1 DSB-marking foci. The average number of DSB foci per cell per patient sample was determined as a function of the absorbed dose to the blood and compared with an in vitro calibration curve established in our laboratory with 131I and 177Lu.

Results

The average number of radiation-induced foci (RIF) per cell increased over the first 5 h after radionuclide administration and decreased thereafter. A linear fit from 0 to 5 h as a function of the absorbed dose to the blood agreed with our in vitro calibration curve. At later time-points the number of RIF decreased, indicating progression of DNA repair.

Conclusion

Measurements of RIF and the absorbed dose to the blood after systemic administration of 177Lu may be used to obtain data on the individual dose–response relationships in vivo. Individual patient data were characterized by a linear dose-dependent increase and an exponential decay function describing repair.
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Metadata
Title
DNA damage in blood lymphocytes in patients after 177Lu peptide receptor radionuclide therapy
Authors
Uta Eberlein
Carina Nowak
Christina Bluemel
Andreas Konrad Buck
Rudolf Alexander Werner
Harry Scherthan
Michael Lassmann
Publication date
01-10-2015
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Nuclear Medicine and Molecular Imaging / Issue 11/2015
Print ISSN: 1619-7070
Electronic ISSN: 1619-7089
DOI
https://doi.org/10.1007/s00259-015-3083-9

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