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Graefe s Archive for Clinical and Experimental Ophthalmology
Article . 2008 . Peer-reviewed
License: Springer TDM
Data sources: Crossref
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Expression of the SST receptor 2 in uveal melanoma is not a prognostic marker

Authors: Filali, MKE; Kiliç, Emine; Melis, Marleen; de Klein, Annelies; Jong, Marcel; Luyten, GPM (Gre);

Expression of the SST receptor 2 in uveal melanoma is not a prognostic marker

Abstract

Uveal melanoma (UM) cells and neurohormone-producing cells both originate from the neural crest. Somatostatin receptors subtype 2 (SSTR2) are over-expressed in several tumors, often from neuroendocrine origin, and synthetic antagonists like octreotide and octreotate are being used as diagnostic or therapeutic agents. We investigated the SSTR2 expression in UM, and determined whether this expression was related to prognosis of the disease.UM cell lines and fresh primary UM samples were tested for SSTR2 expression by autoradiography (AR) using 125I-Tyr3-octreotate. Furthermore, UM cell lines were analyzed for SSTR2 mRNA expression with quantitative real-time RT-PCR.Using AR, cell-surface SSTR2 expression was demonstrated in two UM metastatic cell lines, but no expression was detected in three cell lines derived from primary UM. However, all primary and metastatic UM cell lines showed mRNA expression levels for SSTR2 using quantitative real-time RT-PCR. Only three of 14 primary UM demonstrated moderate SSTR2 expression, and this expression was not significantly associated with tumor-free survival or any tested prognostic factor.Based on the rare and low expression of SSTR2 found in primary UM specimens and in UM cell lines, we conclude that SSTR2 is not widely expressed in UM. Furthermore, SSTR2 expression was not associated with tumor-free survival and prognostic factors. Therefore SSTR2 is not suited as prognostic marker or therapeutic target in UM.

Keywords

Male, Uveal Neoplasms, Reverse Transcriptase Polymerase Chain Reaction, Cell Membrane, EMC OR-01-60-01, Kaplan-Meier Estimate, Middle Aged, Prognosis, Disease-Free Survival, Rats, Pancreatic Neoplasms, Cell Line, Tumor, Biomarkers, Tumor, Animals, Autoradiography, Humans, Female, RNA, Messenger, Receptors, Somatostatin, EMC MGC-02-96-01, Melanoma, Aged

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
3
Average
Average
Average
hybrid