Consistent with the mRNA data, OATP1B3 expression was not associated with increasing histological grades of bladder cancer (P = 0.34; see Table 1 and Figure 3I–K), but trended towards an association with bladder cancer grades despite a low number of samples (P = 0.07; see Table 1). This evidence concerns the gene SLCO1B3 and urinary bladder cancer.