Abstract
[Yttrium-90-DOTA-Tyr3]-octreotide (DOTATOC) and [177Lu-DOTA-Tyr3-Thr8]-octreotide (DOTATATE) are used for peptide receptor-mediated radionuclide therapy (PRMRT) in neuroendocrine tumours. No human data comparing these two compounds are available so far. We used 111In as a surrogate for 90Y and 177Lu and examined whether one of the 111In-labelled peptides had a more favourable biodistribution in patients with neuroendocrine tumours. Special emphasis was given to kidney uptake and tumour-to-kidney ratio since kidney toxicity is usually the dose-limiting factor. Five patients with metastatic neuroendocrine tumours were injected with 222 MBq 111In-DOTATOC and 111In-DOTATATE within 2 weeks. Up to 48 h after injection, whole-body scans were performed and blood and urine samples were collected. The mean absorbed dose was calculated for tumours, kidney, liver, spleen and bone marrow. In all cases 111In-DOTATATE showed a higher uptake (%IA) in kidney and liver. The amount of 111In-DOTATOC excreted into the urine was significantly higher than for 111In-DOTATATE. The mean absorbed dose to the red marrow was nearly identical. 111In-DOTATOC showed a higher tumour-to-kidney absorbed dose ratio in seven of nine evaluated tumours. The variability of the tumour-to-kidney ratio was high and the significance level in favour of 111In-DOTATOC was P=0.065. In five patients the pharmacokinetics of 111In-DOTATOC and 111In-DOTATATE was found to be comparable. The two peptides appear to be nearly equivalent for PRMRT in neuroendocrine tumours, with minor advantages for 111In/90Y-DOTATOC; on this basis, we shall continue to use 90Y-DOTATOC for PRMRT in patients with metastatic neuroendocrine tumours.
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Acknowledgements
The authors wish to thank all supporting personnel of the Division of Radiological Chemistry, especially P. Powell, and the Institute of Nuclear Medicine, especially I. Gutierrez, for their expert help and effort. This work was supported by the Swiss National Foundation (project 3100 AO-100390) and was performed within the COST B12 action. We also wish to thank Drs. M. Konijnenberg (Tyco Healthcare, Petten, The Netherlands) and H. Roser and Prof. J. Roth (Division of Medical Physics, University Hospital Basel) for valuable discussions.
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Forrer, F., Uusijärvi, H., Waldherr, C. et al. A comparison of 111In-DOTATOC and 111In-DOTATATE: biodistribution and dosimetry in the same patients with metastatic neuroendocrine tumours. Eur J Nucl Med Mol Imaging 31, 1257–1262 (2004). https://doi.org/10.1007/s00259-004-1553-6
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DOI: https://doi.org/10.1007/s00259-004-1553-6