ABCB1 and neoplasm: Tumor uptake of [18F]AVT-011, measured as AUC of %ID/g*min from 5–42.5 min, was 15% lower in the intermediate group (Padj = 0.10) and 32% lower in the high ABCB1–expressing group (P < 0.001) than in the basal group (Fig. 4a).