Abstract
A better understanding of transcriptional evolution of IDH-wild-type glioblastoma may be crucial for treatment optimization. Here, we perform RNA sequencing (RNA-seq) (n = 322 test, n = 245 validation) on paired primary-recurrent glioblastoma resections of patients treated with the current standard of care. Transcriptional subtypes form an interconnected continuum in a two-dimensional space. Recurrent tumors show preferential mesenchymal progression. Over time, hallmark glioblastoma genes are not significantly altered. Instead, tumor purity decreases over time and is accompanied by co-increases in neuron and oligodendrocyte marker genes and, independently, tumor-associated macrophages. A decrease is observed in endothelial marker genes. These composition changes are confirmed by single-cell RNA-seq and immunohistochemistry. An extracellular matrix-associated gene set increases at recurrence and bulk, single-cell RNA, and immunohistochemistry indicate it is expressed mainly by pericytes. This signature is associated with significantly worse survival at recurrence. Our data demonstrate that glioblastomas evolve mainly by microenvironment (re-)organization rather than molecular evolution of tumor cells.
| Original language | English |
|---|---|
| Pages (from-to) | 678-692.e7 |
| Journal | Cancer Cell |
| Volume | 41 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 10 Apr 2023 |
Bibliographical note
Acknowledgments:This project has been funded by De Westlandse Ride and The Brain Tumour Charity grant number ET_2019/2_10470 and Télévie grant number 7.6514.17 from Belgium. N.A. is supported by the Ser Cymru II program, which is partly funded by Cardiff University and the European Regional Development Fund through the Welsh Government . The graphical abstract was made using BioRender.com .
Publisher Copyright:
© 2023 The Authors
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