HEPACAM2 and nonpapillary renal cell carcinoma: They were also closely related to tumorigenesis, such as MUC15 (Huang et al., 2009), HEPACAM2 (Klopfleisch et al., 2010), CA10 (Romeo et al., 2009), NRG1 (Huang et al., 2004) and RAB25 (Mitra, Cheng & Mills, 2012), providing a novel information layer to our understanding of ccRCC.