SLCO4A1 and colorectal carcinoma: Because the endogenous expression of SLCO4A1 is more abundant than that of SLCO4A1-AS1 in CRC cells (data not shown), we speculated that this effect of SLCO4A1-AS1 on SLCO4A1 is not a primary mechanism mediating the tumour-promoting functions of SLCO4A1 in CRC.