PROM1 and hepatocellular carcinoma: Several HCC CSC markers have been identified, including cluster of differentiation 90 (CD90), CD24, CD47, CD13, CD133, CD44, intercellular cell adhesion molecule-1 (ICAM1), epithelial cell adhesion molecule (EpCAM), leucine-rich repeat-containing receptor (LGR5), etc. (21).