SLCO1B3 and cancer: Regarding Lt-OATP1B3 mRNA expression, its positive frequencies in cancer and normal lung tissues were 7.1% (2/28) and 3.6% (1/28) (Figure 4), and the Lt-OATP1B3 mRNA level was lower than the Ct-OATP1B3 mRNA level in each matched pair (Additional file 2: Figure S2B).