Dear Editor,
In recent years,there is growing inter-est regarding the roles of senescent bone marrow (BM) microenvironment in the initiation of leukemia.Aged mice transplanted with AML1-ETO (AML1-ETO fusion protein)-positive hematopoietic stem cells (HSCs) present with a signifi-cant increase in the frequency of AML-ETO-positive early progenitor cells in BM as well as an increase of immature mye-loid cells compared to young recipients(Vas et al.,2012).