Immature CD34+ cells represented 0.15 ± 0.28% of the WBC in the PB from LR-MDS patients (median value of 0.05%, ranging from 0.01 to 1.05%), as compared to 0.03 ± 0.01% (median value of 0.03%, ranging from 0.01 to 0.04%) in normal individuals. This evidence concerns the gene CD34 and myelodysplastic syndrome.