KLF4 and acute myeloid leukemia: In addition, by analyzing five independently published gene expression data sets (GSE12417, GSE15434, GSE21261, GSE22845 and GSE37642), we found that the mRNA expression levels of KLF4 and DPYSL2 are positively correlated in primary AML cells (Fig. 3A, Supplementary Fig. S6).