CD34 and acute myeloid leukemia: Consistent with these qRT-PCR results, miR-27a expression levels determined by microarray in a larger number of leukemia samples were significantly lower in pre-B-ALL and T-ALL cases than in CD34+ HSPCs; however, there were no significant differences in miR-27a, miR-23a, or miR-24 levels between CD34+ HSPCs and AML cases (Figure 2A–C).