Abstract
Gangliogliomas are typically low-grade neuroepithelial tumors seen in the pediatric and young adult populations. Despite their often bland histologic appearance, these tumors recur with varying frequencies; however, little data exist that adequately predict ganglioglioma recurrence in children. To identify potential histopathologic features predictive of recurrence-free survival, a series of 53 patients with World Health Organization (WHO) grade I gangliogliomas were evaluated, representing the largest cohort of pediatric gangliogliomas with accompanying histopathologic and survival data. Fifteen patients (28 %) exhibited disease recurrence during the study period. BRAFV600E immunohistochemistry was performed on 47 of these tumors. Histopathologic features associated with shorter recurrence-free survival included an absence of oligodendroglial morphology, higher glial cell density, microvascular proliferation, and the presence of a high lymphoplasmacytic inflammatory infiltrate. Eighteen tumors (38.3 %) had positive BRAFV600E staining, which was associated with shorter recurrence-free survival. Collectively, the combined use of histopathologic and molecular features to stratify grade I gangliogliomas into low and high-risk groups provides important information relevant to the management of children and young adults with these rare tumors.
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Acknowledgments
The authors gratefully acknowledge the work of Drs. Jingqin Luo and Kathryn Trinkaus (Division of Biostatistics, Washington University School of Medicine) who assisted with the statistical analyses. Support for this study was provided by the Children’s Discovery Institute (MC-LI-2009-03R) and the National Institute of Health (T32: 3857-54941D).
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S. Dahiya and D. Haydon made equal contributions to this study.
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Supplementary Figure 1. Mitoses (~5/10 hpf) were noted in the glial component in two cases (arrow; a: H&E stain; b: Double labeling for GFAP {brown} and Ki-67 {purple}) (EPS 2734 kb) (EPS 2734 kb)
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Dahiya, S., Haydon, D.H., Alvarado, D. et al. BRAFV600E mutation is a negative prognosticator in pediatric ganglioglioma. Acta Neuropathol 125, 901–910 (2013). https://doi.org/10.1007/s00401-013-1120-y
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DOI: https://doi.org/10.1007/s00401-013-1120-y