Frontiers in Oncology (Nov 2021)

Whole-Exome Sequencing Reveals Recurrent but Heterogeneous Mutational Profiles in Sporadic WHO Grade 1 Meningiomas

  • María González-Tablas,
  • María González-Tablas,
  • María González-Tablas,
  • Carlos Prieto,
  • Carlos Prieto,
  • Daniel Arandia,
  • Daniel Arandia,
  • María Jara-Acevedo,
  • María Jara-Acevedo,
  • Álvaro Otero,
  • Álvaro Otero,
  • Daniel Pascual,
  • Daniel Pascual,
  • Laura Ruíz,
  • Laura Ruíz,
  • Iván Álvarez-Twose,
  • Iván Álvarez-Twose,
  • Andrés Celestino García-Montero,
  • Andrés Celestino García-Montero,
  • Andrés Celestino García-Montero,
  • Andrés Celestino García-Montero,
  • Alberto Orfao,
  • Alberto Orfao,
  • Alberto Orfao,
  • Alberto Orfao,
  • María Dolores Tabernero,
  • María Dolores Tabernero,
  • María Dolores Tabernero,
  • María Dolores Tabernero

DOI
https://doi.org/10.3389/fonc.2021.740782
Journal volume & issue
Vol. 11

Abstract

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Human WHO grade 1 meningiomas are generally considered benign tumors; despite this, they account for ≈50% of all recurrent meningiomas. Currently, limited data exist about the mutational profiles of grade 1 meningiomas and patient outcome. We investigated the genetic variants present in 32 WHO grade 1 meningiomas using whole exome sequencing, and correlated gene mutational profiles with tumor cytogenetics and patient outcome. Overall, WHO grade 1 meningiomas harbored numerous and heterogeneous genetic variants, which most frequently affected the NF2 (47%) gene and to a less extent the PNMA6A (22%), TIGD1 (16%), SMO (13%), PTEN (13%), CREG2 (9%), EEF1A1 (6%), POLR2A (6%), ARID1B (3%), and FAIM3 (3%) genes. Notably, non-synonymous genetic variants of SMO and POLR2A were restricted to diploid meningiomas, whereas NF2 mutations were only found among tumors that showed -22/22q─ (with or without a complex karyotype). Based on NF2 mutations and tumor cytogenetics, four genetic profiles were defined with an impact on patient recurrence-free survival (RFS). These included (1) two good-prognosis tumor subgroups—diploid meningiomas (n=9) and isolated -22/22q─ associated with NF2 mutation (n=7)—with RFS rates at 10 y of 100%; and (2) two subgroups of poor-prognosis meningiomas—isolated -22/22q─ without NF2 mutation (n=3) and tumors with complex karyotypes (n=11)—with a RFS rate at 10 y of 48% (p=0.003). Our results point out the existence of recurrent but heterogeneous mutational profiles in WHO grade 1 meningiomas which have an impact on patient outcome.

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