PTK2 and medulloblastoma: Ouabain, an Na,K-ATPase inhibitor, inhibited EGF induced medulloblastoma cell motility in a wound healing assay, prevented formation of EGF-induced actin stress fibers, and inhibited EGF-induced phospho-focal adhesion kinase (FAK) localization to the lamellipodia of medulloblastoma cells (Wolle et al., 2014).