Relative to tumor uptake at 45 min, tumor uptake (%ID/g) at 90 min increased by 27.5 ± 9.7% in the basal group, by 31.2 ± 13.3% in the intermediate group, and by 40.9 ± 3.7% in the high ABCB1–expressing group. Here, ABCB1 is linked to neoplasm.