Abstract Library

#4630 Radiolabelled somatostatin receptor (SSTR) antagonist vs. agonist for peptide receptor radionuclide therapy (PPRT) in patients with SSTR positive neuroendocrine tumours – A retrospective basket study

Introduction: PRRT with lutetium-177 labelled somatostatin receptor (SSTR) agonists ([177Lu]Lu-DOTATATE or [177Lu]Lu-DOTATOC (177Lu-TOC) has limited response rate and durability. The SSTR antagonist [177Lu]Lu-DOTA-JR11 (177Lu-JR11) offers potentially increased tumour doses with better efficacy.

Conference:

Presenting Author: Eigler C

Authors: Eigler C, Mushaweh A, McDougall L, Bauman A, Christ E,

Keywords: Somatostatin Receptor, Neuroendocrine Tumour, DOTA-JR11, DOTA-TOC, Peptide Receptor Radionuclide Therapy,

#4619 Targeted beta- plus auger and conversion electron therapy with terbium-161 labelled somatostatin receptor antagonist DOTA-LM3 – BETA plus phase 0 study

Introduction: Radioligand therapy with lutetium-177 labelled somatostatin receptor (SSTR) agonists (177Lu-DOTATATE or 177Lu-DOTATOC) showed limited response rate and durability. The novel SSTR antagonist DOTA-LM3 labelled with terbium-161, which co-emits conversion and Auger electrons in addition to β- particles, potentially increasing tumour doses and offering a more effective treatment for micro metastases.

Conference:

Presenting Author: Fricke J

Authors: Fricke J, Westerbergh F, McDougall L, Christ E, Nicolas G,

Keywords: Radionuclide therapy, PRRT, Auger electrons, Conversion electrons, Terbium-161, radiolabelled somatostatin antagonist, neuroendocrine tumour,

#4533 Receptor radionuclide therapy with 177Lu-DOTATOC (177Luedotreotide or 177Lu-octreotide) in SSTR positive patients: A multicentre, prospective, phase II trial

Introduction: For advanced G1-G2 GEP-NET patients, peptide receptor radionuclide therapy (PRRT) with 177Lu-DOTATATE can be recommended. However, there are several SSTR-positive tumours for which PRRT has previously shown efficacy that are not currently covered by the indications for 177Lu-DOTATATE in Italy and, therefore, cannot benefit from it. Less used and studied is the 177Lu-DOTATOC. This is a radiopeptide with excellent safety and efficacy profile in PRRT and certainly not lower than 177Lu-DOTATATE.

Conference:

Presenting Author: Sansovini M

Authors: Sansovini M, Nicolini S, Grassi I, Marini I, Matteucci F,

Keywords: Lu-dotatoc, Radiopharaceutical Therapy Factory, SSTR positive tumour,

#4207 START-NET: Systemic Targeted Adaptive RadioTherapy of NeuroEndocrine Tumors – An open-label, multi-center, randomised phase III trial comparing safety and efficacy of personalised vs non-personalised radionuclide therapy with 177Lu-DOTATOC

Introduction: Peptide receptor radionuclide therapy (PRRT) with fixed activity dosing is an established treatment for advanced neuroendocrine tumors (NETs). Emerging data suggest that patients may benefit from a personalized treatment approach. Aggressive NET is believed to benefit from more intensive treatment, one example being FDG-PET positive tumors have shown benefit from combining PPRT with chemotherapy. Dosimetry is another means of achieving personalisation and can be used to increase the tumor radiation doses without surpassing the toxicity limits of organs at risk.

Conference:

Presenting Author: Asp P

Authors: Asp P, Sjögreen-Gleisner K, Fröss-Baron K, Sandström M, Hallqvist A,

Keywords: NET, PRRT, dosimetry, PET, 177Lu-DOTATOC, capecitabine,

#3819 Dosimetry evaluation in 177Lu-labeled somatostatin receptor analogue therapy

Introduction: Dosimetry reporting in patients receiving PRRT is fundamental to ensure the safety and efficacy of treatment.

Conference:

Presenting Author:

Authors: Cichoński A, Kempińska-Wróbel M, Kolasińska-Ćwikła A, Zrajkowska A, Szarowicz A,

Keywords: radionuclide therapy, dosimetry, lutetium,