Abstract: In the present invention, inventors have used high throughput sequencing to identify novel mutations in ABCA1 in CM ML patient samples. Further studies in a mouse model of myelomonocytic leukemia driven by hematopoietic Tet2 deficiency have shown that these somatic mutations abrogate the tumor suppressor function of WT ABCA1, resulting in the failure to suppress canonical IL3-receptor beta signaling-driven myelopoiesis. The loss of the myelo-suppressive function of ABCA1 mutants can be overcome by raising HDL levels through overexpression of the human apolipoprotein A-1 (apoA-1) transgene. Inventors have also shown that both IL-3Rbeta blocking antibody and cyclodextrin prevented the proliferation of ABCA1 mutant-transduced Tet2 deficient BM cells similar to the effect of ABCA1-WT overexpression.