TGFB1 and glioblastoma: There was significant correlation between protein levels of TGF-β1 and protein levels of pSmad1/5/8 (r=0.51 p<0.001) for all patients pooled (Figure 3F, Table 2), as well as in the glioblastoma subgroups of newly diagnosed and recurrent tumors (Supplementary Figure 4 F,H).