As shown in Fig. 1, hERG and Eag1 channels are expressed to a similar extent in four glioblastoma cell lines (A172, U87, U251, U373) and primary glioblastoma cells, determined by both immunocytochemistry (Fig. 1a) and Western blotting (Fig. 1b and Suppl. The gene discussed is KCNH2; the disease is glioblastoma.