When the Ct- and Lt-OATP1B3 mRNA levels in cancer tissues were compared, the median value of Ct-OATP1B3 mRNA levels in cancer tissues was 12.2-fold higher than that of Lt-OATP1B3 mRNA levels (19.5 × 103 vs. 1.6 × 103 copies/ng total RNA, P = 2.9 × 10−6) (Figure 2). Here, SLCO1B3 is linked to cancer.