IL13RA2 and central nervous system cancer: By flow cytometry, the IL13Rα2-positive glioma cell lines (PBT015, PBT017-4, PBT030, PBT036, U251T) generally express higher levels of the mesenchymal adhesion markers CD44 and CD54/ICAM-1 than the IL13Rα2-negative glioma lines (PBT003-4, PBT008, PBT009, PBT022) (Figure 3A-3C).