Whereas the results clearly demonstrate that CD133/2+ cord blood-derived G0 and G1/S/G2/M cells in the absence of EPO only form GM colonies and the CD133/2− cells form a mixture of erythroid and GM colonies, the distinction is less consistent and the results are more variable in comparable CML cells. This evidence concerns the gene PROM1 and chronic myelogenous leukemia, BCR-ABL1 positive.