KLF4 and leukemia: Given that KLF4 has a strong impact on macrophage differentiation28,29 and KLF4 expression in leukemia-derived monocytes may differ to monocytes obtained from healthy individuals, these inconsistent data may be caused by the use of primary macrophages (this study and31) versus leukemia-derived cell lines from humans and mice (THP124 and RAW264.7 cells26).