All MSCs isolated from controls and MDS subtypes showed high positivity for CD90 with >95% mean percentage of positive cells (control: 99.6 ± 0.2%, RCUD: 99.3 ± 0.5%, RCMD: 99.6 ± 0.1%, RAEB: 96.7 ± 3.2%) and high fluorescent intensity (4th logarithmic decade) (supplementary Figure 2). This evidence concerns the gene THY1 and myelodysplastic syndrome with excess blasts.