In contrast to the other ABCB1-expressing neuroblastoma cell lines UKF-NB-6rDOX20 and UKF-NB-6rVCR10, the vincristine-resistant UKF-NB-3 subline UKF-NB-3rVCR10 did not display decreased levels of SLC35F2 (Figure 1e), although it was not resensitized to YM155 to the level of the respective parental cell line UKF-NB-3 by the ABCB1 inhibitor verapamil (Figure 1b and Supplementary Table 1). This evidence concerns the gene ABCB1 and neuroblastoma.