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Published in: Journal of Neuro-Oncology 1/2023

Open Access 21-08-2023 | Oligodendroglioma | Research

Long-term follow up of patients with WHO grade 2 oligodendroglioma

Authors: Louise Carstam, Francesco Latini, Ole Solheim, Jiri Bartek Jr., Lars K. Pedersen, Maria Zetterling, Stanislav Beniaminov, Kristin Sjåvik, Mats Ryttlefors, Margret Jensdottir, Bertil Rydenhag, Anja Smits, Asgeir S. Jakola

Published in: Journal of Neuro-Oncology | Issue 1/2023

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Abstract

Purpose

Since the introduction of the molecular definition of oligodendrogliomas based on isocitrate dehydrogenase (IDH)-status and the 1p19q-codeletion, it has become increasingly evident how this glioma entity differs much from other diffuse lower grade gliomas and stands out with longer survival and often better responsiveness to adjuvant therapy. Therefore, apart from using a molecular oligodendroglioma definition, an extended follow-up time is necessary to understand the nature of this slow growing, yet malignant condition. The aim of this study was to describe the long-term course of the oligodendroglioma disease in a population-based setting and to determine which factors affect outcome in terms of survival.

Methods

All adults with WHO-grade 2 oligodendrogliomas with known 1p19q-codeletion from five Scandinavian neurosurgical centers and with a follow-up time exceeding 5 years, were analyzed regarding survival and factors potentially affecting survival.

Results

126 patients diagnosed between 1998 and 2016 were identified. The median follow-up was 12.0 years, and the median survival was 17.8 years (95% CI 16.0–19.6).
Factors associated with shorter survival in multivariable analysis were age (HR 1.05 per year; CI 1.02–1.08, p < 0.001), tumor diameter (HR 1.05 per millimeter; CI 1.02–1.08, p < 0.001) and poor preoperative functional status (KPS < 80) (HR 4.47; CI 1.70–11.78, p = 0.002). In our material, surgical strategy was not associated with survival.

Conclusion

Individuals with molecularly defined oligodendrogliomas demonstrate long survival, also in a population-based setting. This is important to consider for optimal timing of therapies that may cause long-term side effects. Advanced age, large tumors and poor function before surgery are predictors of shorter survival.

Graphical Abstract

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Literature
Metadata
Title
Long-term follow up of patients with WHO grade 2 oligodendroglioma
Authors
Louise Carstam
Francesco Latini
Ole Solheim
Jiri Bartek Jr.
Lars K. Pedersen
Maria Zetterling
Stanislav Beniaminov
Kristin Sjåvik
Mats Ryttlefors
Margret Jensdottir
Bertil Rydenhag
Anja Smits
Asgeir S. Jakola
Publication date
21-08-2023
Publisher
Springer US
Published in
Journal of Neuro-Oncology / Issue 1/2023
Print ISSN: 0167-594X
Electronic ISSN: 1573-7373
DOI
https://doi.org/10.1007/s11060-023-04368-6

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