SLCO3A1 and hepatocellular carcinoma: To further examine the clinical relevance of OATP3A1 and OATP4A1 genes, we surveyed several HCC clinical samples (C34566, C90706, C64003, B66873, and C42511), which were all shown to overexpress OATP3A1 at mRNA and/or protein levels (Figure 5E and 5F).