Molecular pathways in gliomagenesis and their relevance to neuropathologic diagnosis.

Abstract:

:Gliomas are a large and diverse group of primary brain tumors that include those that are diffusely infiltrative and others that are well-circumscribed and low grade. Diffuse gliomas are currently classified by the World Health Organization as astrocytomas, oligodendrogliomas, or oligoastrocytomas and range in grade from II to IV. Glioblastoma (GBM), World Health Organization grade IV, is the highest grade and most common form of astrocytoma. In the past, the diagnosis of gliomas was almost exclusively based on histopathologic features. More recently, improved understanding of molecular genetic underpinnings has led to ancillary molecular studies becoming standard for classification, prognostication, and predicting therapy response. Isocitrate dehydrogenase (IDH) mutations are frequent in grade II and III infiltrating gliomas and secondary GBMs. Infiltrating astrocytomas and secondary GBMs are characterized by IDH, TP53, and ATRX mutations, whereas oligodendrogliomas demonstrate 1p/19q codeletion and mutations in IDH, CIC, FUBP1, and the telomerase reverse transcriptase (TERT) promoter. Primary GBMs typically lack IDH mutations and are instead characterized by EGFR, PTEN, TP53, PDGFRA, NF1, and CDKN2A/B alterations and TERT promoter mutations. Pediatric GBMs differ from those in adults and frequently have mutations in H3F3A, ATRX, and DAXX, but not IDH. In contrast, circumscribed, low-grade gliomas of childhood, such as pilocytic astrocytoma, pleomorphic xanthoastrocytoma, and ganglioglioma, often harbor mutations or activating gene rearrangements in BRAF. Neuropathologic assessment of gliomas increasingly relies on ancillary testing of molecular alterations for proper classification and patient management.

journal_name

Adv Anat Pathol

authors

Appin CL,Brat DJ

doi

10.1097/PAP.0000000000000048

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

50-8

issue

1

eissn

1072-4109

issn

1533-4031

pii

00125480-201501000-00003

journal_volume

22

pub_type

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