CCL5 and glioblastoma: We next analyzed CCL5 mRNA expression in the four GBM molecular subtypes using data from the Cancer Genome Atlas (TCGA, provisional), and found that mesenchymal GBM (M-GBM) exhibited the highest levels of CCL5 mRNA expression, while proneural GBM (PN-GBM) expressed the lowest (Figure 1B).