FN1 and glioblastoma: Because our RNA-Seq analysis revealed that fibronectin (FN; FN1 gene) was differentially expressed in GBM (log2[fold change] = 5.3; P = 6.9 × 10–22) CAFs relative to pericytes (Supplemental Table 1) and because FN is the most abundant GBM ECM protein (41), we further analyzed CAF FN1 expression.