Advanced

Feasibility of simplifying renal dosimetry in 177Lu peptide receptor radionuclide therapy

Sundlöv, Anna LU ; Gustafsson, Johan LU ; Brolin, Gustav LU ; Mortensen, Nadja ; Hermann, Rebecca ; Bernhardt, Peter ; Svensson, Johanna ; Ljungberg, Michael LU ; Tennvall, Jan LU and Sjögreen Gleisner, Katarina LU (2018) In EJNMMI Physics 5(1).
Abstract

Background: Recently, 177Lu-dotatate therapy for neuroendocrine tumours has received regulatory approval. Dosimetry can be used to optimize treatment on an individual basis, but there is no international consensus as to how it should be done. The aim of this study is to determine a feasible and accurate dosimetry method to guide individualized peptide receptor radionuclide therapy (PRRT) for patients with neuroendocrine tumours. As part of a clinical trial on 177Lu-dotatate therapy, renal dosimetry was performed for all patients in each treatment cycle, using a hybrid planar-SPECT/CT method. In the present study, we use the image data acquired from 22 patients and 119 cycles and define a set of alternative... (More)

Background: Recently, 177Lu-dotatate therapy for neuroendocrine tumours has received regulatory approval. Dosimetry can be used to optimize treatment on an individual basis, but there is no international consensus as to how it should be done. The aim of this study is to determine a feasible and accurate dosimetry method to guide individualized peptide receptor radionuclide therapy (PRRT) for patients with neuroendocrine tumours. As part of a clinical trial on 177Lu-dotatate therapy, renal dosimetry was performed for all patients in each treatment cycle, using a hybrid planar-SPECT/CT method. In the present study, we use the image data acquired from 22 patients and 119 cycles and define a set of alternative treatment planning strategies, each representing a simplification in terms of image acquisition and dosimetric calculations. The results from the simplified strategies are compared to the results from the protocol-prescribed hybrid planar-SPECT/CT-based method by analysing differences both in per-cycle and total cumulative absorbed dose (AD) analyses. Results: In general, the SPECT-based methods gave results that were largely consistent with the protocol-specified hybrid method, both in the per-cycle and cumulative AD analyses. Notably, performing one SPECT/CT per cycle at 96 h yielded ADs that were very similar to the protocol method. The methods using planar dosimetry resulted in larger variations, as expected, while giving 4 cycles to all patients resulted in the largest inter-individual differences in cumulative AD. Conclusions: Performing one SPECT/CT at 96 h in every treatment cycle gives sufficiently reliable dosimetric results to base individualized treatment planning on, with a reasonable demand on resources.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
177-Lutetium, Dosimetry, Dotatate, Neuroendocrine, PRRT, SPECT
in
EJNMMI Physics
volume
5
issue
1
article number
12
publisher
Springer Open
external identifiers
  • pmid:29974391
  • scopus:85049693337
ISSN
2197-7364
DOI
10.1186/s40658-018-0210-2
language
English
LU publication?
yes
id
b700ca04-227b-4a55-93ab-4f930d382871
date added to LUP
2018-07-24 08:57:25
date last changed
2020-10-27 01:55:13
@article{b700ca04-227b-4a55-93ab-4f930d382871,
  abstract     = {<p>Background: Recently, <sup>177</sup>Lu-dotatate therapy for neuroendocrine tumours has received regulatory approval. Dosimetry can be used to optimize treatment on an individual basis, but there is no international consensus as to how it should be done. The aim of this study is to determine a feasible and accurate dosimetry method to guide individualized peptide receptor radionuclide therapy (PRRT) for patients with neuroendocrine tumours. As part of a clinical trial on <sup>177</sup>Lu-dotatate therapy, renal dosimetry was performed for all patients in each treatment cycle, using a hybrid planar-SPECT/CT method. In the present study, we use the image data acquired from 22 patients and 119 cycles and define a set of alternative treatment planning strategies, each representing a simplification in terms of image acquisition and dosimetric calculations. The results from the simplified strategies are compared to the results from the protocol-prescribed hybrid planar-SPECT/CT-based method by analysing differences both in per-cycle and total cumulative absorbed dose (AD) analyses. Results: In general, the SPECT-based methods gave results that were largely consistent with the protocol-specified hybrid method, both in the per-cycle and cumulative AD analyses. Notably, performing one SPECT/CT per cycle at 96 h yielded ADs that were very similar to the protocol method. The methods using planar dosimetry resulted in larger variations, as expected, while giving 4 cycles to all patients resulted in the largest inter-individual differences in cumulative AD. Conclusions: Performing one SPECT/CT at 96 h in every treatment cycle gives sufficiently reliable dosimetric results to base individualized treatment planning on, with a reasonable demand on resources.</p>},
  author       = {Sundlöv, Anna and Gustafsson, Johan and Brolin, Gustav and Mortensen, Nadja and Hermann, Rebecca and Bernhardt, Peter and Svensson, Johanna and Ljungberg, Michael and Tennvall, Jan and Sjögreen Gleisner, Katarina},
  issn         = {2197-7364},
  language     = {eng},
  month        = {12},
  number       = {1},
  publisher    = {Springer Open},
  series       = {EJNMMI Physics},
  title        = {Feasibility of simplifying renal dosimetry in <sup>177</sup>Lu peptide receptor radionuclide therapy},
  url          = {http://dx.doi.org/10.1186/s40658-018-0210-2},
  doi          = {10.1186/s40658-018-0210-2},
  volume       = {5},
  year         = {2018},
}