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Published in: Neuroradiology 12/2017

01-12-2017 | Diagnostic Neuroradiology

New prognostic factor telomerase reverse transcriptase promotor mutation presents without MR imaging biomarkers in primary glioblastoma

Authors: Tunc F. Ersoy, Vera C. Keil, Dariusch R. Hadizadeh, Gerrit H. Gielen, Rolf Fimmers, Andreas Waha, Barbara Heidenreich, Rajiv Kumar, Hans H. Schild, Matthias Simon

Published in: Neuroradiology | Issue 12/2017

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Abstract

Purpose

Magnetic resonance (MR) imaging biomarkers can assist in the non-invasive assessment of the genetic status in glioblastomas (GBMs). Telomerase reverse transcriptase (TERT) promoter mutations are associated with a negative prognosis. This study was performed to identify MR imaging biomarkers to forecast the TERT mutation status.

Methods

Pre-operative MRIs of 64/67 genetically confirmed primary GBM patients (51/67 TERT-mutated with rs2853669 polymorphism) were analyzed according to Visually AcceSAble Rembrandt Images (VASARI) (https://​wiki.​cancerimagingarc​hive.​net/​display/​Public/​VASARI+Research+​Project) imaging criteria by three radiological raters. TERT mutation and O6-methylguanine-DNA methyltransferase (MGMT) hypermethylation data were obtained through direct and pyrosequencing as described in a previous study. Clinical data were derived from a prospectively maintained electronic database. Associations of potential imaging biomarkers and genetic status were assessed by Fisher and Mann-Whitney U tests and stepwise linear regression.

Results

No imaging biomarkers could be identified to predict TERT mutational status (alone or in conjunction with TERT promoter polymorphism rs2853669 AA-allele). TERT promoter mutations were more common in patients with tumor-associated seizures as first symptom (26/30 vs. 25/37, p = 0.07); these showed significantly smaller tumors [13.1 (9.0–19.0) vs. 24.0 (16.6–37.5) all cm3; p = 0.007] and prolonged median overall survival [17.0 (11.5–28.0) vs. 9.0 (4.0–12.0) all months; p = 0.02]. TERT-mutated GBMs were underrepresented in the extended angularis region (p = 0.03), whereas MGMT-methylated GBMs were overrepresented in the corpus callosum (p = 0.03) and underrepresented temporomesially (p = 0.01).

Conclusion

Imaging biomarkers for prediction of TERT mutation status remain weak and cannot be derived from the VASARI protocol. Tumor-associated seizures are less common in TERT mutated glioblastomas.
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Metadata
Title
New prognostic factor telomerase reverse transcriptase promotor mutation presents without MR imaging biomarkers in primary glioblastoma
Authors
Tunc F. Ersoy
Vera C. Keil
Dariusch R. Hadizadeh
Gerrit H. Gielen
Rolf Fimmers
Andreas Waha
Barbara Heidenreich
Rajiv Kumar
Hans H. Schild
Matthias Simon
Publication date
01-12-2017
Publisher
Springer Berlin Heidelberg
Published in
Neuroradiology / Issue 12/2017
Print ISSN: 0028-3940
Electronic ISSN: 1432-1920
DOI
https://doi.org/10.1007/s00234-017-1920-1

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