NECTIN4 and neoplasm: Tumor uptake of [89Zr]Zr-AGS-22M6 in nectin-4–transduced MDA-MB-231 cells (MDA-MB-231-nectin-4) transduced to express the receptor ranged from an average of 38.8 ± 2.8 %ID/g on day 1 to an average of 39.9 ± 5.9 %ID/g on day 6 with an average high of 45.3 ± 2.4 %ID/g on day 3 compared with nontransduced receptor–negative MDA-MB-231-neo that ranged from ranged from an average of 16.3 ± 1.8 %ID/g on day 1 to an average of 17.2 ± 1.3 %ID/g on day 6 with an average high of 18.2 ± 2.8 %ID/g on day 2.