WT1 and myelodysplastic syndrome: Statistically significant differences were also observed in the expression levels of WT1 mRNA in PB and BM of MDS patients between the WPSS-R relatively low-risk group(extremely low-risk + low-risk + moderate risk)and the relatively high-risk group(high-risk + extremely high-risk)(PB: 2.56±0.79 vs 3.61±0.82, P<0.05; BM: 3.45±0.83 vs 3.93±1.00, P<0.05).