SLCO1B1 and leukemia: Consistent with this supposition, and with our previous findings in the NC-I60 panel of cell lines (64), we found that neither the OATP1B1 nor the OATP1B3 gene is detectable in 6 different leukemia cells lines (Figure 4A and Supplemental Table 4) or in samples from pediatric patients with leukemia (Figure 4, B and C), and that the uptake of vincristine in malignant cells is not substantially altered by nilotinib (Figure 4D).