In addition, in D283 cells, a cell line derived from medulloblastoma metastasis in the peritoneum, ouabain did not inhibit EGF-induced activation of Erk1/2 but reduced EGF-induced Akt activation (Fig. S2A) and almost completely abolished EGF-induced EGFR phosphorylation (Fig. S2B). Here, AKT1 is linked to medulloblastoma.