Expression of the surface protein CD133 (also known as AC133 and prominin-1) is one criterion which has been used in the identification of putative cancer stem cells from solid tumors (brain: [5,6], lung: [22], skin melanoma: [23], prostate: [24], kidney: [25], colon: [26,27], liver: [28]). This evidence concerns the gene PROM1 and cutaneous melanoma.