When Ct-OATP1B3 mRNA levels between colon and lung cancer tissues were compared, it was found that the median value of Ct-OATP1B3 mRNA levels in colon cancer tissues was 8.1-fold higher than that in lung cancer tissues (19.5 × 103 vs. 2.4 × 103 copies/ng total RNA, Mann–Whitney U test, P = 0.037) (Figure 5). Here, SLCO1B3 is linked to malignant colon neoplasm.