ABCB1 and adrenal cortex carcinoma: Among our ACC PDXs, there was considerably lower surface ABCB1 expression in POBNCI_ACC004 (Fig. 3E), which had initial complete responses to ADCT-701, compared to both 164165 and 592788 (Fig. 3E), which had partial but no complete anti-tumor responses to ADCT-701.