We analyzed transcriptome data from 128 GBM cases with available MRI records in TCGA (Table S1) to produce the average correlation values between EC marker genes (CDH5, CLDN5, VWF) and the other >20,000 protein encoding genes, yielding 343 EC-enriched genes manifesting correlation coefficient >0.3 (Figures 1A, B and Table S2). Here, CLDN5 is linked to glioblastoma.