IL4 and glioblastoma: Analysis of cytokine gene expression in GBC-PC reflected upregulation of the mRNA of the anti-inflammatory cytokine genes Tgfb and Il10. Il1b and Il12 gene expression was not detected even in control pericytes (not shown), and the mRNA level of Tnfa, Il4 and Il23 in pericytes was not significantly affected by GBM cells.