Interactions between immunocytes and Neural Stem Cells (NSCs) in glioblastoma multiforme still remains unclear. Here, microglial cells and NSCs in peri-tumoral tissue were analyzed via single-cell whole-transcriptome sequencing. Results showed that two clusters of putative NSCs (the EGFR+BCAN+ cell cluster, and the FABPT+H19+ cell cluster) exhibited immune-related functions. Two clusters of putative microglia (the XIST+PDK4+ and APOC1+CCL3+ cell clusters) exhibited the function of glial cell activation. The results of ligand receptor network analysis disclosed significant interactions between the APOC1+CCL3+ microglia and the NSCs. Correlation analysis on the overall survival (OS) and relapse-free survival (RFS) with 102 potential molecular targets in the TCGA database showed that a much larger number of molecules were correlated with RFS than with OS (34.31% vs. 8.82%), nine of them were validated in clinical specimens. In conclusion, crosstalk between APOC1+CCL3+ microglia and multiple molecule-labeled NSCs distal to the tumor core play certain roles on the recurrence of GBM. Keywords: Glioblastoma multiforme; Immunological microenvironment; Recurrence; Single-cell RNA sequencing.

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