PROM1 and hepatocellular carcinoma: Several proteins have emerged as potential markers for the identification of TSCs in HCC: CD133, CD90, CD24, CD44, CD13, oval cell marker 6 (OV6), side population (SP), Aldehyde Dehydrogenase (ALDH) activity, and the epithelial cell adhesion molecule (EpCAM) [8, 9].