CD34 and acute myeloid leukemia: In contrast, the association between p21 and PBX1 was not observed in either FLT3-ITD- AML cells (r = -0.13, GSE1159, Fig 8E, bottom panel) or normal human CD34+ cells (GSE2666, HG-U133A and GSE30029, www.ncbi.nlm.nih.gov/geo/) [43].