We found that the ABCB1-overexpressing human KB-V-1 epidermal cancer cells (Figure 1a) and the ABCB1-overexpressing human NCI-ADR-RES ovarian cancer cells (Figure 1b) are equally sensitive to sitravatinib as their drug-sensitive parental KB-3-1 and OVCAR-8 cancer cells, respectively. Here, ABCB1 is linked to cancer.