Development of Multiplex Biomarker Assay to Subtype Pancreatic Neuroendocrine Tumors (PanNETs) with Distinct Prognosis and Mutations Abstract #2215

Introduction: Overall 5-year survival for PanNETs ranges from 25-100%. The treatment paradigm for PanNETs largely based upon grades, which is significantly heterogeneous. We previously defined three molecular subtypes (distributed grades) of PanNETs using PanNETassigner signature. There is an unmet clinical need for prognostic and predictive biomarkers and clinically-relevant assays to complement grade and improve patient stratification.
Aim(s): To develop a novel low-cost multiplex biomarker assay to stratify PanNETs into molecular subtypes with distinct prognosis and grades.
Materials and methods: Primary untreated PanNET fresh-frozen samples (n=157) were profiled for 198 PanNETassigner genes using NanoString platform to develop NanoPanNETassigner assay. Concordance between RNAseq and NanoPanNETassigner subtypes was assessed using our unsupervised integrative metavariable model (iMVM). Univariate/multivariate analysis were performed for overall survival, grades and mutations.

To read results and conclusion, please login ...

Further abstracts you may be interested in

#9 Case Management of Metastatic carcinoid of the Foregut,Midgut and Hindgut:the relevance of Ki-67 prognostication
Introduction: The predictive value of tumor grade in the prognosis of carcinoid is insufficient and somehow misleading. The grade and differentiation in carcinoid tumors must be seen in conjunction with the Ki-67 index. The Ki-67 protein is a cellular marker for proliferation, present during all active phases of the cell cycle (G1, S, G2 and mitosis) and absent from resting cells (G0). It is therefore an excellent marker to determine the growth fraction of a given cell population. The Ki-67 labelling index is often correlated with the clinical course of carcinoid.
Conference: 7th Annual ENETS Conference (2010)
Category: Basic
Presenting Author: Dr Marianne J Kohler
#11 Plasma chromogranin - A response to octreotide test: Prognostic value for clinical outcome in endocrine digestive tumors
Introduction: Gastroenteropancreatic neuroendocrine tumors (GEP-NETs) expressing somatostatin receptors may be treated with somatostatin analogues (SSAs). Selection criteria are a positive Octreoscan® or a >50% hormone level decrease after octreotide s.c. injection (octreotide test) (OT). Plasma chromogranin A (CgA) is the best general GEP-NET marker, but data on CgA response to OT are scant.
Conference: 7th Annual ENETS Conference (2010)
Category: Clinical
Presenting Author: MD, PhD Sara Massironi
#12 Chromogranin A as a predictor of progression, regression or stable disease in ileo-cecal (midgut) carcinoid tumors
Introduction: A general characteristic for NETs is their expression of certain proteins, such as chromogranin A (CgA), which is released from the dense core vesicles of NE cells, occasionally together with cell specific hormones, such as gastrin and serotonin. Plasma CgA seems to be closely related to tumor burden of intestinal carcinoid tumors in humans.
Conference: 7th Annual ENETS Conference (2010)
Category: Clinical
Presenting Author: Kenneth Jensen
#13 Neoadjuvant peptide receptor radionuclide therapy for an inoperable neuroendocrine pancreatic carcinoma
Introduction: Pancreatic endocrine tumors (pNETs) are rare but are among the most common neuroendocrine neoplasms of the abdomen. At diagnosis, many of them are already advanced and difficult to treat.
Conference: 7th Annual ENETS Conference (2010)
Category: Clinical
Presenting Author: Dr. Daniel Kaemmerer
#16 Endoglin as indicator of metastatic neuroendocrine tumors of the pancreas
Introduction: Neuroendocrine tumors of the pancreas are rare, highly vascularized tumors. Endoglin, a Transforming Growth Factor-β co-receptor, is a marker for angiogenic endothelial cells. Angiogenesis is required for tumor progression and the development of metastases. Recently, endoglin expression was found to be a prognostic marker in pancreatic carcinomas. However, the role of endoglin in neuroendocrine pancreatic tumors has so far not been studied.
Conference: 7th Annual ENETS Conference (2010)
Category: Basic
Presenting Author: Patricia Kuiper