TGFB1 and cancer: AICAR 5-amino-4-imidazolecarboxamide riboside, AMP adenosine monophosphate, AMPK, AMP-activated protein kinase, CSC cancer stem cell, EMT epithelial-to-mesenchymal transition, GAPDH glyceraldehyde 3-phosphate dehydrogenase, LKB1 liver kinase B1, SNAIL1/2 transcription repressors for E-cadherin, TGF-β transforming growth factor beta, ZEB1 zinc finger E-box binding homeobox 1