SLCO4A1 and cancer: We further analyzed a number of human gastric cancer data sets deposited at the Oncomine website, a cancer microarray database and data-mining platform [22], and identified significantly higher expression of select OATPs, including OATP1B3, OATP2B1, OATP3A1, OATP4A1 and OATP5A1, in gastric cancer patient samples compared to normal tissue samples (Figure 4D).