PCAT1 and colorectal carcinoma: Lnc-PCAT1 from CRC exosomes can promote epithelial to mesenchymal transition (EMT) and liver metastasis in CRC by regulating the activity of the Netrin-1-CD146 complex in circulating tumor cells (CTCs) and thus provide a new molecular target for the treatment of liver metastasis in CRC (24).