These cancer sphere lines were identified through the expression of CD133 and the epithelial specific antigen ESA, displayed adherence to the culture dishes in the presence of serum and subsequently differentiated into large, polygonal colon cells expressing colon epithelial markers, such as villin, suggesting that colon cancer spheres maintained the ability to in vitro differentiate in enterocyte-like cells. This evidence concerns the gene PROM1 and cancer.