Abstract Library

#4402 Australasian Gastro-Intestinal Trials Group (AGITG) STOPNET: A randomised study of cessation of somatostatin analogues after peptide receptor radionuclide therapy (PRRT) in mid, hind-gut, and pancreatic neuroendocrine tumours

Introduction: After progressing on somatostatin analogues (SSA), patients with somatostatin receptor positive gastroenteropancreatic (GEP) NETs often receive PRRT. It is unclear whether current practice of continuing SSA after commencing PRRT is beneficial, especially in non-functioning NETs.

Conference:

Presenting Author:

Authors: Burge M, Wyld D, Pattison D, Loree J, Goodwin R,

Keywords: Somatostatin analogue, peptide receptor radionuclide therapy, gastroenteropancreatic, neuroendocrine, non-functioning, cessation, Australasian Gastro-Intestinal Trials Group (AGITG), Canadian Cancer Trials Group (CCTG),

#3886 Large cell neuroendocrine carcinoma subtyping based on NEUROD1, ASCL1, POU2F3 and YAP1 expression

Introduction: Large cell neuroendocrine carcinoma (LCNEC) accounts for 1-3% of all types of lung cancer and is, similar to small-cell lung cancer (SCLC), a high-grade tumor with poor prognosis. pRb can also be used to subclassify LCNEC into SCLC-like and NSCLC-like. SCLC can be classified in 4 transcriptomic subtypes (NEUROD1high, ASCL1high, POU2F3high, YAP1high), which may have therapeutic implications. It is unclear whether these subtypes are also found in LCNEC and if they correlate with pRb expression.

Conference:

Presenting Author: Heijboer F

Authors: Rijnsburger N, Heijboer F, Derks J, Hermans B, Hillen L,

Keywords: LCNEC, pulmonary, immunohistochemistry, pathology, pRb, transcription factors,

#3244 Efficacy and safety of immune checkpoint inhibitors in patients with neuroendocrine neoplasia: Report of a case series from a large tertiary centre

Introduction: Immune checkpoint inhibitors (ICI) have changed our view on how to treat cancer. Despite their approved treatment of many different cancers, efficacy of ICI in neuroendocrine neoplasia is limited and poorly understood. Established treatment options of neuroendocrine tumors (NET) and carcinomas (NEC) are based on surgery, tumor-targeted medical treatments, peptide guided radioreceptor therapy (PRRT) and locoregional therapies. However, in many patients these treatments lose efficacy over time, and novel therapies are urgently needed.

Conference: 18th Annual ENETS Concerence (2021)

Presenting Author: Roderburg C

Authors: Özdirik B, Jann H, Tacke F, Wiedenmann B, Roderburg C,

Keywords: checkpoint inhibitor, neuroendocrine neoplasia, PD-L1,

#2119 Positron Emission Tomography (PET) Predictors of Tumor Response to Peptide Receptor Radionuclide Therapy (PRRT) in Metastatic Neuroendocrine Tumors (NET)

Introduction: Pretherapeutic 68Gallium-DOTA-(0-Tyr3)-octreotate (68Ga-DOTATATE) PET standardised uptake value (SUV) has shown conflicting results in the prediction of tumour response to radionuclide therapy.

Conference: 15th Annual ENETSConcerence (2018)

Presenting Author:

Authors: Ladwa R, Pattison D, Smith J, Goodman S, Burge M,

Keywords: 68Ga-DOTATATE PET-CT, SUV parameters, Tumor response, Somatostatin receptor tumor volume,

#2069 Tumor Absorbed Dosimetry and Response of Radionuclide Therapy in Metastatic Neuroendocrine Tumor

Introduction: Increased tumour lesion absorbed dosimetry (TLAD) from peptide receptor radionuclide therapy (PRRT) is associated with neuroendocrine tumours (NET) response. Responses to PRRT might be impacted by NET grade, site of origin and use of concurrent chemotherapy.

Conference: 15th Annual ENETSConcerence (2018)

Presenting Author:

Authors: Ladwa R, Pattison D, Smith J, Goodman S, Burge M,

Keywords: 68Ga-DOTATATE PET, Tumor Dosimetry, Response,