Abstract:
:Glioblastoma (GBM) is the most aggressive malignant primary brain tumor in adults, with a median survival of 14.6 months. Recent efforts have focused on identifying clinically relevant subgroups to improve our understanding of pathogenetic mechanisms and patient stratification. Concurrently, the role of immune cells in the tumor microenvironment has received increasing attention, especially T cells and tumor-associated macrophages (TAM). The latter are a mixed population of activated brain-resident microglia and infiltrating monocytes/monocyte-derived macrophages, both of which express ionized calcium-binding adapter molecule 1 (IBA1). This study investigated differences in immune cell subpopulations among distinct transcriptional subtypes of GBM. Human GBM samples were molecularly characterized and assigned to Proneural, Mesenchymal or Classical subtypes as defined by NanoString nCounter Technology. Subsequently, we performed and analyzed automated immunohistochemical stainings for TAM as well as specific T cell populations. The Mesenchymal subtype of GBM showed the highest presence of TAM, CD8+, CD3+ and FOXP3+ T cells, as compared to Proneural and Classical subtypes. High expression levels of the TAM-related gene AIF1, which encodes the TAM-specific protein IBA1, correlated with a worse prognosis in Proneural GBM, but conferred a survival benefit in Mesenchymal tumors. We used our data to construct a mathematical model that could reliably identify Mesenchymal GBM with high sensitivity using a combination of the aforementioned cell-specific IHC markers. In conclusion, we demonstrated that molecularly distinct GBM subtypes are characterized by profound differences in the composition of their immune microenvironment, which could potentially help to identify tumors amenable to immunotherapy.
journal_name
Oncoimmunologyjournal_title
Oncoimmunologyauthors
Kaffes I,Szulzewsky F,Chen Z,Herting CJ,Gabanic B,Velázquez Vega JE,Shelton J,Switchenko JM,Ross JL,McSwain LF,Huse JT,Westermark B,Nelander S,Forsberg-Nilsson K,Uhrbom L,Maturi NP,Cimino PJ,Holland EC,Kettenmann H,doi
10.1080/2162402X.2019.1655360subject
Has Abstractpub_date
2019-08-22 00:00:00pages
e1655360issue
11eissn
2162-4011issn
2162-402Xpii
1655360journal_volume
8pub_type
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