Abstract
Introduction
The phenotypic heterogeneity of diffuse gliomas is still inconsistently explained by known molecular abnormalities. Here, we report the molecular and radiological features of diffuse grade WHO II and III gliomas involving the insula and its potential impact on prognosis.
Methods
Clinical, pathological, molecular and neuro-radiological features of 43 consecutive patients who underwent a surgical resection between 2006 and 2013 for a grade II and III gliomas involving the insula was retrospectively analyzed.
Results
Median age was 44.4 years. Eight patients had oligodendrogliomas, IDH mutant (IDHmut) and 1p/19q-codeleted (6 grade II, 2 grade III). Twenty-eight patients had diffuse astrocytomas, IDHmut (22 grade II and 6 grade III) and seven patients had grade II diffuse astrocytomas, IDHwt (A-IDHwt). Vimentin staining was exclusively recorded in tumor cells from A-IDHwt (p = 0.001). Mean cerebral blood volume (CBV) (p = 0.018), maximal value of CBV (p = 0.017) and ratio of the corrected CBV (p = 0.022) were lower for A-IDHwt. Volumetric segmentation of ADC allowed the identification of the tumor cores, which were smaller in A-IDHwt (p < 0.001). The tumor occurrences of A-IDHwt were exclusively located into the temporo-insular region. Median progression-free survival (PFS) and overall survival (OS) were 50.9 months (95% CI: 26.7–75.0) and 80.9 months (60.1–101.6). By multivariate analysis, A-IDHwt (p = 0.009; p = 0.019), 7p gain and 10q loss (p = 0.009; p = 0.016) and vimentin positive staining (p = 0.011; p = 0.029) were associated with poor PFS and OS respectively.
Conclusions
Insular low-grade A-IDHwt presented with poor prognosis despite a smaller tumor core and no evidence of increased perfusion on MR imaging.
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11 March 2019
In the initial, online publication, the authors' given names were captured as family names and vice versa. The names are correctly shown here. The original article has been corrected.
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Funding
This work was supported by grants from Institut National du Cancer (Grant No. INCa-DGOS-Inserm 6038), from the Cancéropôle PACA (Grant No. 2015-02 INSUL802) and the GEFLUC Marseille Provence (Groupement Entreprises Françaises Lutte contre le Cancer—PVM-2014-241). We thank the AP-HM Tumor Bank (Authorization Number: AC2018-31053; CRB BB-0033-00097) for providing tissue samples. We also thank the ARTC-Sud patients’s association (Association pour le Recherche sur les Tumeurs Cérébrales).
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Compes, P., Tabouret, E., Etcheverry, A. et al. Neuro-radiological characteristics of adult diffuse grade II and III insular gliomas classified according to WHO 2016. J Neurooncol 142, 511–520 (2019). https://doi.org/10.1007/s11060-019-03122-1
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DOI: https://doi.org/10.1007/s11060-019-03122-1