Abstract
Purpose
For meningiomas, the 2016 revision of the WHO classification introduced brain invasion per se as a sufficient condition to classify as grade II. We analyzed whether meningiomas previously graded as WHO grade I differ in prognosis depending on the presence of microscopic brain invasion.
Methods
A consecutive series of patients with intracranial meningioma WHO grade I (± brain invasion) at two neurosurgical departments was analyzed retrospectively. Cox regression models on progression-free survival (PFS) and Kaplan–Meier survival estimates were performed.
Results
875 adult patients were included. Histological diagnosis of brain invasion was confirmed in 28 patients. Median follow-up was 73 months. In univariate and multivariate models, gross total resection gained favorable prognostic influence for PFS (p < 0.001, HR: 0.237, CI 0.170–0.382). 170 patients with the brain/meningioma interface present in histopathological specimen were separately analyzed as a subgroup. Importantly, presence of brain invasion did not reach significance for PFS, even in the subgroup with available specimen of brain/meningioma interface (p = 0.787, HR: 0.852, CI 0.268–2.710 and p = 0.811, HR: 0.848, CI 0.222–3.246, respectively). Patients with and without brain invasion did not differ in terms of age, tumor location and extent of resection, but were more likely to receive radiotherapy (p = 0.03) of tumor remnants. However, subgroup analysis of non-irradiated tumors revealed no prognostic influence of brain invasion (p = 0.749, HR: 0.772, CI 0.158–3.767).
Conclusions
In this bi-institutional series, brain invasion was frequent among meningiomas WHO grade I when brain/meningioma interface was available for histology (16.5%). However, brain invasion did not impact early recurrence.
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The authors would like to thank Mandy Barthel and Raffaela Vitalini for review of patient data.
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Development of study concept: AB, CJ, JCT, CS; Composition of manuscript: AB, CJ, JCT, CS; Review of histologic specimen: RE, AVD; Statistical analysis: AB, BS.
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The study was approved by the ethic committees of Ludwig-Maximilians University (Approval Number: 18–837) and Ruprecht-Karls University (Approval Number: S-005/2003)
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Biczok, A., Jungk, C., Egensperger, R. et al. Microscopic brain invasion in meningiomas previously classified as WHO grade I is not associated with patient outcome. J Neurooncol 145, 469–477 (2019). https://doi.org/10.1007/s11060-019-03312-x
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DOI: https://doi.org/10.1007/s11060-019-03312-x