ANGPT1 and myelodysplastic syndrome with ring sideroblasts: The Ang-1 expression was much higher in FAB RAEB or RAEB-t subgroup than in RA or RARS subgroup; in WHO RAEB-1 or RAEB-2 subgroup than in other categories; and in IPSS INT-2/high-risk subgroup than in low/INT-1 subgroup (all P-value <0.001; Supplementary Figure 3).