CD34 and acute lymphoblastic leukemia: Both T‐ALL subgroups had higher mean promoter methylation than the normal sorted CD34+ and CD3+ T cells, and the CIMP+ subgroup showed significantly (P < 0.001) higher mean promoter methylation levels (0.47 ± 0.02) than the CIMP− subgroup (0.41 ± 0.01) (Table 1; Figure 1A).