Tumor Evolution of Glioma-Intrinsic Gene Expression Subtypes Associates with Immunological Changes in the Microenvironment

Publication date: 10 July 2017
Source:Cancer Cell, Volume 32, Issue 1
Author(s): Qianghu Wang, Baoli Hu, Xin Hu, Hoon Kim, Massimo Squatrito, Lisa Scarpace, Ana C. deCarvalho, Sali Lyu, Pengping Li, Yan Li, Floris Barthel, Hee Jin Cho, Yu-Hsi Lin, Nikunj Satani, Emmanuel Martinez-Ledesma, Siyuan Zheng, Edward Chang, Charles-Etienne Gabriel Sauvé, Adriana Olar, Zheng D. Lan, Gaetano Finocchiaro, Joanna J. Phillips, Mitchel S. Berger, Konrad R. Gabrusiewicz, Guocan Wang, Eskil Eskilsson, Jian Hu, Tom Mikkelsen, Ronald A. DePinho, Florian Muller, Amy B. Heimberger, Erik P. Sulman, Do-Hyun Nam, Roel G.W. Verhaak
We leveraged IDH wild-type glioblastomas, derivative neurospheres, and single-cell gene expression profiles to define three tumor-intrinsic transcriptional subtypes designated as proneural, mesenchymal, and classical. Transcriptomic subtype multiplicity correlated with increased intratumoral heterogeneity and presence of tumor microenvironment. In silico cell sorting identified macrophages/microglia, CD4⁺ T lymphocytes, and neutrophils in the glioma microenvironment. NF1 deficiency resulted in increased tumor-associated macrophages/microglia infiltration. Longitudinal transcriptome analysis showed that expression subtype is retained in 55% of cases. Gene signature-based tumor microenvironment inference revealed a decrease in invading monocytes and a subtype-dependent increase in macrophages/microglia cells upon disease recurrence. Hypermutation at diagnosis or at recurrence associated with CD8⁺ T cell enrichment. Frequency of M2 macrophages detection associated with short-term relapse after radiation therapy.

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Teaser

Wang et al. define three IDH wild-type glioblastoma-intrinsic gene expression subtypes, which are partly shaped by the tumor immune environment. NF1 deficiency results in increased macrophage/microglia infiltration. Comparison of matched primary and recurrent tumors reveals frequent expression subtype changes.


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