By contrast, the increase in tumor uptake between 45 and 90 min in animals not treated with tariquidar (Fig. 3d) was 10.4 ± 10.6% in the basal group (n = 4 mice) and 5.4 ± 12.6% in the high ABCB1–expressing group (n = 5 mice). This evidence concerns the gene ABCB1 and neoplasm.