ABCG2 and ovarian carcinoma: To this end, we employed 2008/MRP1 human ovarian carcinoma cells stably infected to overexpress the ABCC1 gene which encodes for the MDR efflux transporter MRP1 37 and the MDR non‐small cell lung cancer cells A549/K1.5 which overexpress the MDR pump BCRP encoded by the ABCG2 gene 38.