Abstract Library

#4540 Retrospective analysis of somatostatin receptors expression in cohort of thoracic neuroendocrine neoplasms with immunohistochemistry method or PET/CT Ga68 DOTA-TATE

Introduction: Somatostatin receptors (SSTRs) expression in cohort of thoracic neuroendocrine neoplasms (NENs) is still not fully described. We attempted to evaluate the SSTR expression by IHC and PET/CT with Ga68 DOTA-TATE, as well as the sensitivity of both methods.

Conference:

Presenting Author: Evdokimova E

Authors: Evdokimova E, Vorobeva M, Zhulikov Y, Markovich A, Gorbunova V,

Keywords: NEN, thoracic, SSTR, IHC, DOTATATE, lung, thymus, mediastinum, LCNC, NET,

#4132 ACTION-1: A randomised phase Ib/3 trial of RYZ101 compared with standard of care in somatostatin receptor positive, well-differentiated gastroenteropancreatic neuroendocrine tumors with progression following 177Lu somatostatin analogue therapy

Introduction: Well-differentiated gastroenteropancreatic neuroendocrine tumors (GEP-NETs) are characterized by high-density expression of somatostatin receptors (SSTRs). RYZ101 (225Ac-DOTATATE) is a highly potent alpha-emitting radiopharmaceutical therapy (RPT) being developed for SSTR+ solid tumors. ACTION-1 is a 2-part, global, randomized, controlled, open-label, Phase 1b/3 trial of RYZ101. Part 1 (Phase 1b), an uncontrolled dose de-escalation study, is complete with no dose-limiting toxicities.

Conference:

Presenting Author: Singh S

Authors: Singh S, Tesselaar M, Strosberg J, Jacene H, Halperin D,

Keywords: RYZ101, Gastroenteropancreatic neuroendocrine tumor, Somatostatin receptor, Radiopharmaceutical therapy,

#3818 Somatostatin analogues or active surveillance in sporadic non-functioning pancreatic neuroendocrine tumors

Introduction: Non-functioning (NF), sporadic, G1-G2 pancreatic neuroendocrine tumors (PanNETs) usually display an indolent course. Surgery is the first-choice treatment for localized tumors >2 cm. Unresectable or metastatic PanNETs expressing somatostatin receptors (SSTRs) are treated with somatostatin analogues (SSAs). The PROMID and the CLARINET studies proved the SSA antiproliferative effect in advanced gastroenteropancreatic neuroendocrine tumors (GEP-NETs). The standard treatment for patients with PanNETs ≤2cm is active surveillance (AS). Yet no evidence of the value of SSA treatment exist in such patient population.

Conference:

Presenting Author: Maratta M

Authors: Maratta M, Chiloiro S, Raia S, Maiorano B, Rossi E,

Keywords: PanNET, somatostatin analogues, efficacy, surveillance, medical treatment,

#3779 177Lu-DOTATATE in advanced neuroendocrine neoplasms of different locations – Data from 552 cases in the SEPTRALU registry

Introduction: Peptide receptor radionuclide therapy (PRRT) is a therapeutic strategy selected via a marker, somatostatin receptor (SSTRs) expression, with activity in gastroenteropancreatic neuroendocrine neoplasms (GEP-NENs). Its role in tumor sites outside the digestive tract remains unclear.

Conference:

Presenting Author:

Authors: Mitjavila Casanovas M, Carmona-Bayonas A, Bello P, de Matias Leralta J, Garcia Burillo A,

Keywords: 177Lu-DOTATATE, lung, neuroendocrine tumor, PRRT, pheochromocytoma, radionuclide therapy,

#3758 A novel hormone-based anti-SSTR T-cell engager for the treatment of neuroendocrine tumors

Introduction: Somatostatin receptors (SSTRs) are overexpressed by well-differentiated neuroendocrine tumors (NETs).

Conference:

Presenting Author: Pelle E

Authors: Pelle E, Cives M, Medina E, Mason C, Snedal S,

Keywords: Bispecific T cell Engagers, CD3, SSTR, TILs, Immunotherapy,