A three-microRNA signature identifies two subtypes of glioblastoma patients with different clinical outcomes

Giovanna Marziali, Mariachiara Buccarelli, Alessandro Giuliani, Ramona Ilari, Sveva Grande, Alessandra Palma, Quintino G. D'Alessandris, Maurizio Martini, Mauro Biffoni, Roberto Pallini, Lucia Ricci-Vitiani

Research output: Contribution to journalArticle

Abstract

Glioblastoma multiforme (GBM) is the most common and malignant primary brain tumor in adults, characterized by aggressive growth, limited response to therapy, and inexorable recurrence. Because of the extremely unfavorable prognosis of GBM, it is important to develop more effective diagnostic and therapeutic strategies based on biologically and clinically relevant patient stratification systems. Analyzing a collection of patient-derived GBM stem-like cells (GSCs) by gene expression profiling, nuclear magnetic resonance spectroscopy, and signal transduction pathway activation, we identified two GSC clusters characterized by different clinical features. Due to the widely documented role played by microRNAs (miRNAs) in the tumorigenesis process, in this study we explored whether these two GBM patient subtypes could also be discriminated by different miRNA signatures. Global miRNA expression pattern was analyzed by oblique principal component analysis and principal component analysis. By a combined inferential strategy on PCA results, we identified a reduced set of three miRNAs – miR-23a, miR-27a, and miR-9* (miR-9-3p) – able to discriminate the proneural- and mesenchymal-like GSC phenotypes as well as mesenchymal and proneural subtypes of primary GBM included in The Cancer Genome Atlas (TCGA) data set. Kaplan–Meier analysis showed a significant correlation between the selected miRNAs and overall survival in 429 GBM specimens from TCGA-identifying patients who had an unfavorable outcome. The survival prognostic capability of the three-miRNA signatures could have important implications for the understanding of the biology of GBM subtypes and could be useful in patient stratification to facilitate interpretation of results from clinical trials.

Original languageEnglish
Pages (from-to)1115-1129
Number of pages15
JournalMolecular Oncology
Volume11
Issue number9
DOIs
Publication statusPublished - Sep 1 2017

Keywords

  • glioblastoma
  • glioblastoma stem-like cells
  • microRNAs
  • patient stratification

ASJC Scopus subject areas

  • Molecular Medicine
  • Genetics
  • Cancer Research

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