We generated four pancreatic cancer cell types exhibiting ABC transporter overexpression: BxPC3/MDR1, PANC1/MDR1, BxPC3/MRP1, and PANC1/MRP1 (Figure 1), which we labelled as the OE group, referring to cells transduced with MDR1- or MRP1-containing lentiviral overexpression vectors. This evidence concerns the gene ABCG2 and familial pancreatic carcinoma.