ITGAM and myelodysplastic syndrome: In attempt to unravel the cell source of SBSN in BM of MDS, we identified CD11b+ myeloid polymorphonuclear (PMN) and mononuclear (MN) cells to express SBSN. Further analysis revealed the highest SBSN mRNA levels in early‐stage MDSCs (eMDSCs) compared to other MDS BM cell subpopulations including MDSCs, monocytes, granulocytes, and adipocytes.