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Published in: Journal of Neuro-Oncology 3/2013

01-09-2013 | Clinical Study

A population-based study of low-grade gliomas and mutated isocitrate dehydrogenase 1 (IDH1)

Authors: Rikke H. Dahlrot, Bjarne W. Kristensen, Jacob Hjelmborg, Jørn Herrstedt, Steinbjørn Hansen

Published in: Journal of Neuro-Oncology | Issue 3/2013

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Abstract

Low-grade gliomas (LGG) have a slow growth rate, but transformations into malignant gliomas with a rapid deterioration occur in many patients. The aim of this study was to evaluate clinical prognostic factors in a population-based cohort of patients with LGG. In addition we investigated the expression and prognostic value of the isocitrate dehydrogenase 1 (IDH1) R132H mutation. Seventy-four patients diagnosed between 2005 and 2009 in the Region of Southern Denmark were identified using the Danish Cancer Register and The Danish Pathology Databank. Survival analysis using Cox regression was performed in 52 patients with tumor samples useable for immunohistochemical evaluation of IDH1 status. Patients with a contrast enhancing tumor, neurological deficits, headache, an astrocytic tumor and PS 2–4 had an increased risk of recurrence. In univariate analysis age > 50 years (HR 2.14, 95 % CI 1.08–4.24), having neurological deficit (HR 2.28, 95 % CI 1.15–4.52), receiving post-surgical treatment (HR 2.52, 95 % CI 1.19–5.32), being in performance status 2–4 (HR 1.44, 95 % CI 1.15–1.81), and having an astrocytic tumor (HR 3.79, 95 % CI 1.64–8.73) were associated with poor survival. Mutated IDH1 (mIDH1) was identified in 46 % of the patients and was significantly correlated to a good survival in both univariate (HR 0.24, 95 % CI 0.11–0.53) and in multivariate analysis (HR 0.40, 95 % CI 0.17–0.91). The other clinical variables were not significant when adjusted for the effect of mIDH1 status. We find that young age, the absence of neurologic deficit, PS 0–1 and oligodendroglial histology were associated with better survival. IDH1 status showed independent prognostic information when adjusting for classical prognostic factors, and should be validated in a larger patient population.
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Metadata
Title
A population-based study of low-grade gliomas and mutated isocitrate dehydrogenase 1 (IDH1)
Authors
Rikke H. Dahlrot
Bjarne W. Kristensen
Jacob Hjelmborg
Jørn Herrstedt
Steinbjørn Hansen
Publication date
01-09-2013
Publisher
Springer US
Published in
Journal of Neuro-Oncology / Issue 3/2013
Print ISSN: 0167-594X
Electronic ISSN: 1573-7373
DOI
https://doi.org/10.1007/s11060-013-1186-3

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