Updated project metadata. Leukemia cells instruct their surrounding bone marrow microenvironment (BMM) rendering it hospitable to leukemia cell survival. Conversely, how cells of the BMM influence leukemia progression is less well understood. Pleckstrin homology domain family M member 1 (PLEKHM1) serves as a hub between fusion and secretion of intracellular vesicles. Here, we performed TMT-based quantitative proteomics to investigate the proteome of BMM-derived leucocytesfrom mice lacking Plekhm1 compared to wild-type animals, which have been transplanted withBCR-ABL1-expressing bone marrow cells.