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Published in: Journal of Neuro-Oncology 1/2019

01-01-2019 | Clinical Study

Surgical management of lower-grade glioma in the spotlight of the 2016 WHO classification system

Authors: Daniel Delev, Dieter Henrik Heiland, Pamela Franco, Peter Reinacher, Irina Mader, Ori Staszewski, Silke Lassmann, Stefan Grau, Oliver Schnell

Published in: Journal of Neuro-Oncology | Issue 1/2019

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Abstract

Purpose

According to the 2016 WHO classification lower-grade gliomas consist of three groups: IDH-mutated and 1p/19q co-deleted, IDH-mutated and IDH-wildtype tumors. The aim of this study was to evaluate the impact of surgical therapy for lower-grade gliomas with a particular focus on the molecular subgroups.

Methods

This is a bi-centric retrospective analysis including 299 patients, who underwent treatment for lower-grade glioma between 1990 and 2016. All tumors were re-classified according to the 2016 WHO classification. Data concerning baseline and tumor characteristics, overall survival, different treatment modalities and functional outcome were analyzed.

Results

A total of 112 (37.5%) patients with IDH-mutation and 1p/19q co-deletetion, 86 (28.8%) patients with IDH-mutation and 101 (33.8%) patients with IDH-wildtype tumors were identified. The median overall survival (mOS) differed significantly between the groups (p < 0.001). Surgical resection was performed in 226 patients and showed significantly improved mOS compared to the biopsy group (p = 0.001). Gross total resection (GTR) was associated with better survival (p = 0.007) in the whole cohort as well as in the IDH-mutated and IDH-wildtype groups compared to partial resection or biopsy. IDH-wildtype patients presented a significant survival benefit after combined radio-chemotherapy compared to radio- or chemotherapy alone (p = 0.02). Good clinical status (NANO) was associated with longer OS (p = 0.001).

Conclusion

The impact of surgical treatment on the outcome of lower-grade gliomas depends to a great extent on the molecular subtype of the tumors. Patients with more aggressive tumors (IDH-wildtype) seem to profit from more intensive treatment like GTR, multiple resections and combined radio-/chemotherapy.
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Literature
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Metadata
Title
Surgical management of lower-grade glioma in the spotlight of the 2016 WHO classification system
Authors
Daniel Delev
Dieter Henrik Heiland
Pamela Franco
Peter Reinacher
Irina Mader
Ori Staszewski
Silke Lassmann
Stefan Grau
Oliver Schnell
Publication date
01-01-2019
Publisher
Springer US
Published in
Journal of Neuro-Oncology / Issue 1/2019
Print ISSN: 0167-594X
Electronic ISSN: 1573-7373
DOI
https://doi.org/10.1007/s11060-018-03030-w

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