CD34 and myelodysplastic syndrome: In analogy to our results with CB-derived HPCs, BM-derived CD34+ cells revealed significantly higher proliferation if stimulated with serum from MDS-patients (del(5q): p = 0.0005; high-risk MDS: p = 0.0007; low-risk MDS: p = 0.0019; Figure 5 in Text S1).