FXYD6 and hepatocellular carcinoma: Although FXYD6 has been known to be a regulator of Na+/K+-ATPase and Delprat et al. has revealed the relation of FXYD6 with Na+/K+-ATPase in rat inner ear (Delprat et al., 2007a; Delprat et al., 2007b), whether or not FXYD6 interacts with the Na+/K+-ATPase in HCC remains elusive.