Somatic Mosaicism of IDH1 R132H Predisposes to Anaplastic Astrocytoma: A Case of Two Siblings.

Journal Article

Anaplastic astrocytomas are aggressive glial cancers that present poor prognosis and high recurrence. Heterozygous IDH1 R132H mutations are common in adolescent and young adult anaplastic astrocytomas. In a majority of cases, the IDH1 R132H mutation is unique to the tumor, although rare cases of anaplastic astrocytoma have been described in patients with mosaic IDH1 mutations (Ollier disease or Maffucci syndrome). Here, we present two siblings with IDH1 R132H mutant high grade astrocytomas diagnosed at 14 and 26 years of age. Analysis of IDHR132H mutations in the siblings' tumors and non-neoplastic tissues, including healthy regions of the brain, cheek cells, and primary teeth indicate mosaicism of IDHR132H. Whole exome sequencing of the tumor tissue did not reveal any other common mutations between the two siblings. This study demonstrates the first example of IDH1 R132H mosaicism, acquired during early development, that provides an alternative mechanism of cancer predisposition.

Full Text

Duke Authors

Cited Authors

  • Lee, S; Kambhampati, M; Almira-Suarez, MI; Ho, C-Y; Panditharatna, E; Berger, SI; Turner, J; Van Mater, D; Kilburn, L; Packer, RJ; Myseros, JS; Vilain, E; Nazarian, J; Bornhorst, M

Published Date

  • 2019

Published In

Volume / Issue

  • 9 /

Start / End Page

  • 1507 -

PubMed ID

  • 32010615

Pubmed Central ID

  • PMC6971203

International Standard Serial Number (ISSN)

  • 2234-943X

Digital Object Identifier (DOI)

  • 10.3389/fonc.2019.01507


  • eng

Conference Location

  • Switzerland