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Open Access 01-10-2014 | Original Paper

Histopathological spectrum of paediatric diffuse intrinsic pontine glioma: diagnostic and therapeutic implications

Authors: Pawel Buczkowicz, Ute Bartels, Eric Bouffet, Oren Becher, Cynthia Hawkins

Published in: Acta Neuropathologica | Issue 4/2014

Abstract

Diffuse intrinsic pontine glioma (DIPG) is the main cause of brain tumour-related death in children. In the majority of cases diagnosis is based on clinical and MRI findings, resulting in the scarcity of pre-treatment specimens available to study. Our group has developed an autopsy-based protocol to investigate the histologic and biologic spectrum of DIPG. This has also allowed us to investigate the terminal pattern of disease and gain a better understanding of what challenges we are facing in treating DIPG. Here, we review 72 DIPG cases with well documented clinical history and molecular data and describe the pathological features of this disease in relation to clinical and genetic features. Fifty-three of the samples were autopsy material (7 pre-treatment) and 19 were pre-treatment biopsy/surgical specimens. Upon histological review, 62 patients had high-grade astrocytomas (18 WHO grade III and 44 WHO grade IV patients), 8 had WHO grade II astrocytomas, and 2 had features of primitive neuroectodermal tumour (PNET). K27M-H3 mutations were exclusively found in tumours with WHO grade II–IV astrocytoma histology. K27M-H3.1 and ACVR1 mutations as well as ALT phenotype were only found in WHO grade III–IV astrocytomas, while PIK3CA mutations and PDGFRA gains/amplifications were found in WHO grade II–IV astrocytomas. Approximately 1/3 of DIPG patients had leptomeningeal spread of their tumour. Further, diffuse invasion of the brainstem, spinal cord and thalamus was common with some cases showing spread as distant as the frontal lobes. These findings suggest that focal radiation may be inadequate for some of these patients. Importantly, we show that clinically classic DIPGs represent a diverse histologic spectrum, including multiple cases which would fit WHO criteria of grade II astrocytoma which nevertheless behave clinically as high-grade astrocytomas and harbour the histone K27M-H3.3 mutation. This suggests that the current WHO astrocytoma grading scheme may not appropriately predict outcome for paediatric brainstem gliomas.

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Title: Histopathological spectrum of paediatric diffuse intrinsic pontine glioma: diagnostic and therapeutic implications
Authors: Pawel Buczkowicz
Ute Bartels
Eric Bouffet
Oren Becher
Cynthia Hawkins
Publication date: 01-10-2014
Publisher: Springer Berlin Heidelberg
Published in: Acta Neuropathologica / Issue 4/2014
Print ISSN: 0001-6322
Electronic ISSN: 1432-0533
DOI: https://doi.org/10.1007/s00401-014-1319-6

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Histopathological spectrum of paediatric diffuse intrinsic pontine glioma: diagnostic and therapeutic implications

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