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Erschienen in: Child's Nervous System 8/2013

01.08.2013 | Original Paper

Somatostatin receptor subtype 2 (sst2) is a potential prognostic marker and a therapeutic target in medulloblastoma

verfasst von: Marc Remke, Esther Hering, Nicolas U. Gerber, Marcel Kool, Dominik Sturm, Christian H. Rickert, Joachim Gerß, Stefan Schulz, Thomas Hielscher, Martin Hasselblatt, Astrid Jeibmann, Volkmar Hans, Vijay Ramaswamy, Michael D. Taylor, Torsten Pietsch, Stefan Rutkowski, Andrey Korshunov, Carmelia-Maria Monoranu, Michael C. Frühwald

Erschienen in: Child's Nervous System | Ausgabe 8/2013

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Abstract

Introduction

Neuroectodermal tumors in general demonstrate high and dense expression of the somatostatin receptor subtype 2 (sst2). It controls proliferation of both normal and neoplastic cells. sst2 has thus been suggested as a therapeutic target and prognostic marker for certain malignancies.

Methods

To assess global expression patterns of sst 2 mRNA, we evaluated normal (n = 353) and tumor tissues (n = 340) derived from previously published gene expression profiling studies. These analyses demonstrated specific upregulation of sst 2 mRNA in medulloblastoma (p < 0.001). sst2 protein was investigated by immunohistochemistry in two independent cohorts.

Results

Correlation of sst2 protein expression with clinicopathological variables revealed significantly higher levels in medulloblastoma (p < 0.05) compared with CNS-PNET, ependymoma, or pilocytic astrocytoma. The non-SHH medulloblastoma subgroup tumors showed particularly high expression of sst2, when compared to other tumors and normal tissues. Furthermore, we detected a significant survival benefit in children with tumors exhibiting high sst2 expression (p = 0.02) in this screening set. A similar trend was observed in a validation cohort including 240 independent medulloblastoma samples.

Conclusion

sst2 is highly expressed in medulloblastoma and deserves further evaluation in the setting of prospective trials, given its potential utility as a prognostic marker and a therapeutic target.
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Metadaten
Titel
Somatostatin receptor subtype 2 (sst2) is a potential prognostic marker and a therapeutic target in medulloblastoma
verfasst von
Marc Remke
Esther Hering
Nicolas U. Gerber
Marcel Kool
Dominik Sturm
Christian H. Rickert
Joachim Gerß
Stefan Schulz
Thomas Hielscher
Martin Hasselblatt
Astrid Jeibmann
Volkmar Hans
Vijay Ramaswamy
Michael D. Taylor
Torsten Pietsch
Stefan Rutkowski
Andrey Korshunov
Carmelia-Maria Monoranu
Michael C. Frühwald
Publikationsdatum
01.08.2013
Verlag
Springer Berlin Heidelberg
Erschienen in
Child's Nervous System / Ausgabe 8/2013
Print ISSN: 0256-7040
Elektronische ISSN: 1433-0350
DOI
https://doi.org/10.1007/s00381-013-2142-4

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