“…Natural compounds with such properties include resveratrol (affects Wnt/β-catenin, Notch and Smad-dependent TGFβ signaling) [ 134 , 254 , 312 ], DATS (decreases Wnt/β-catenin and Notch) [ 137 , 257 ], honokiol (downregulates Notch and PI3K/Akt/mTOR) [ 253 , 441 ] and garlic-derived Z-ajoene (affects Notch, Wnt and HH) [ 442 ]. In our previous work, we found that extracts from Phlomis fruticosa L., Ononis spinosa L. and Anthriscus cerefolium L. plants and bis-Bibenzyls from the Liverwort Pellia endiviifolia have anti-GBM activity in vitro [ 443 , 444 , 445 , 446 ], and future research of these extracts and compounds should decipher whether the mechanism underlying their antitumor effect involves targeting dysregulated signaling pathways in GBM. It is important to point out that targeting the same signaling pathway in GSCs and GBM tumor cells can affect diverse sets of target genes and, consequently, different cellular processes.…”