ABCC4 and intrahepatic cholangiocarcinoma: In addition, HuCCT1 cells, an intrahepatic CCA (ICC) cell line, expressed MRP1, MRP2, MRP4, MRP5, and MRP6, whereas KMBC cells, an extrahepatic CCA (ECC) cell line, expressed MRP1, MRP3, MRP4, and MRP5.