KDM6A (UTX) encodes a histone demethylase enzyme. In vitro and in vivo experiments examining KDM6A depletion and overexpression in bladder tumor cells support a role for KDM6A as a suppressor of tumor growth and cell migration. It is found to be mutated at a low frequency in ccRCC tumors (1%). How KDM6A inactivation contributes to ccRCC tumor biology remains to be determined.