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Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging 1/2012

01.01.2012 | Original Article

The tumour sink effect on the biodistribution of 68Ga-DOTA-octreotate: implications for peptide receptor radionuclide therapy

verfasst von: Jean-Mathieu Beauregard, Michael S. Hofman, Grace Kong, Rodney J. Hicks

Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging | Ausgabe 1/2012

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Abstract

Purpose

Tumour sequestration of radiotracer may lead to decreased bioavailability in healthy tissue resulting in lower absorbed radiation dose to critical organs. This study aims to assess the impact of disease burden, body habitus and urinary excretion on the biodistribution of 68Ga-DOTA-octreotate.

Methods

Ten patients with highly varied burden of somatostatin receptor-positive neuroendocrine tumour on 68Ga-DOTA-octreotate positron emission tomography (PET)/CT were selected. Volumes of interest were drawn to derive the average uptake of renal parenchyma, spleen and body background, as well as to compute the fraction of injected activity sequestered in tumour and excreted in urine. Uptake values were assessed for correlation with tumour sequestration, weight, lean body weight, body surface area and urinary excretion.

Results

There was a trend for tumour sequestration, body habitus and urinary excretion to inversely influence all healthy tissue uptake values. In particular, renal uptake, splenic intensity and background soft tissue activity were all significantly correlated to composite factors combining tumour sequestration with body habitus and renal excretion. When combined with body habitus index or a body habitus index and renal excretion, tumour sequestration was strongly and significantly correlated inversely with renal uptake.

Conclusion

Our results suggest that tumour sequestration of 68Ga-DOTA-octreotate is a major factor leading to a sink effect that decreases activity concentration in healthy organs such as the kidney. However, body habitus and renal function also influence tissue biodistribution, in a synergistic fashion. Compared with a fixed-dose peptide receptor radionuclide therapy protocol, an adjusted-dose regimen tailored to tumour burden, body habitus and renal function may allow greater radiation dose to individual lesions without substantially adding to toxicity in normal tissues.
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Metadaten
Titel
The tumour sink effect on the biodistribution of 68Ga-DOTA-octreotate: implications for peptide receptor radionuclide therapy
verfasst von
Jean-Mathieu Beauregard
Michael S. Hofman
Grace Kong
Rodney J. Hicks
Publikationsdatum
01.01.2012
Verlag
Springer-Verlag
Erschienen in
European Journal of Nuclear Medicine and Molecular Imaging / Ausgabe 1/2012
Print ISSN: 1619-7070
Elektronische ISSN: 1619-7089
DOI
https://doi.org/10.1007/s00259-011-1937-3

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