MTOR and cancer: The complex and intricate signaling network that involves TGF-β, PI3Ks/AKT/mTOR (Mammalian target of rapamycin), MAPK (Mitogen-activated protein kinase), Wnt, Janus kinase/signal transducers and activators of transcription, EGFR (Epidermal growth factor receptor), Hippo, and nuclear factor kappa-light-chain-enhancer of activated B cells, among other signaling pathways, makes CAFs vulnerable to crosstalk with cancer cells.