SMAD2 and colorectal carcinoma: MiR-140-5p was found to target SMAD2 as part of the TGF-β/SMAD2/SMAD3 pathway and ATG12 in autophagosome formation, which suggests that miR-140-5p can regulate the stemness of CRC CSCs via the TGF-β pathway and through the autophagy of CRC CSCs.