ABCC1 and gliosarcoma: Additionally, patient-derived primary glioblastoma (G6, G8, G12, G38, G39, G43, G44, G59, and G75), recurrent glioblastoma (G14, G46, G64, and G76), Oligoastrocytoma (G10), and Gliosarcoma (G22 and G28) lysates were assessed with respect to their MRP1 expression (Figure 1B).