Six different SLCO/OATP (OATP1A2, OATP1B1, OATP1B3, OATP2B1, OATP3A1, OATP4A1) are known to effectively transport E1S (Mueller et al., 2015), although their expression and action in CRC is poorly defined. This evidence concerns the gene SLCO1A2 and colorectal carcinoma.