Abstract
Purpose
Grade 3 NENs are aggressive tumours with poor prognosis. PRRT+/− radiosensitising chemotherapy is a potential treatment for disease with high somatostatin receptor (SSTR) expression without spatially discordant FDG-avid disease. We retrospectively evaluated the efficacy of PRRT in G3 NEN.
Methods
Kaplan–Meier estimation was used to determine progression-free survival (PFS) and overall survival (OS) defined from start of PRRT. Subgroup analysis was performed for patients with Ki-67 ≤ 55% and >55%. Anatomical response (RECIST 1.1) and toxicity 3 months after PRRT was determined. Disease control rate (DCR) was defined as complete response (CR), partial response (PR) and stable disease (SD) of those with prior progression.
Results
28 patients (M = 17; age 16–78 years; Ki-67 ≤ 55% = 22) were reviewed. 17 patients had pancreatic, 5 small bowel, 3 large bowel, 2 bronchial and 1 unknown primary disease. 25/28 had significant FDG-avid disease prior to treatment. Most had 177Lu-DOTA-octreotate (median cumulative activity 24.4 GBq, median 4 cycles). Twenty patients had radiosensitising chemotherapy. 89% were treated for disease progression; 79% after prior chemotherapy. Median follow-up was 29 months. The median PFS was 9 months for all patients. 16 patients died (Ki-67 ≤ 55% = 11; Ki-67 > 55% = 5) with median OS of 19 months. For Ki-67 ≤ 55% (N = 22), the median PFS was 12 months and median OS 46 months. For Ki-67 > 55% (N = 6), the median PFS was 4 months and median OS 7 months. On CT imaging, DCR at 3 months post-PRRT was 74%, 35% (8/23) PR and 39% (9/23) SD. Eleven patients received further PRRT due to recrudescent disease after response. Five patients developed progression of discordant FDG-avid disease and were referred for targeted therapy/chemotherapy. Grade 3 and 4 lymphopenia and thrombocytopenia occurred in five and five patients, respectively. No renal or liver toxicity related to treatment was seen.
Conclusions
PRRT achieves clinically relevant disease control with acceptable toxicity in G3 NENs.
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Change history
20 November 2017
On page 4 of the original version of this article, the text “Eight (29%) of the patients had significant FDG-avid disease (i.e. with intensity above liver parenchyma) prior to treatment” needs to be corrected.
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Acknowledgements
Professor Hicks’ research is supported by a National Health and Medical Research Council of Australia Program grant and practitioner fellowship. We thank our radiopharmacists and radiochemists for their excellent support of our theranostics program and our dedicated nuclear medicine technologists and nursing staff for the care of our patients. Finally, we are grateful for the trust invested in us by our patients, their families and their managing clinicians.
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All authors declare no conflicts of interest. No funding was received. All procedures performed were in accordance with the ethical standards of the institutional research committee and all patients provided informed consent for treatment.
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Sue Ping Thang and Mei Sim Lung are co-first authors.
A correction to this article is available online at https://doi.org/10.1007/s00259-017-3886-y.
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Thang, S.P., Lung, M.S., Kong, G. et al. Peptide receptor radionuclide therapy (PRRT) in European Neuroendocrine Tumour Society (ENETS) grade 3 (G3) neuroendocrine neoplasia (NEN) - a single-institution retrospective analysis. Eur J Nucl Med Mol Imaging 45, 262–277 (2018). https://doi.org/10.1007/s00259-017-3821-2
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DOI: https://doi.org/10.1007/s00259-017-3821-2