ID2 and acute myeloid leukemia: From real-time quantitative PCR (RQ-PCR) analysis, ID2 mRNA level in AML patients (median: 1.259, range: 0.000-27.387) was significantly higher than controls (median: 0.171, range: 0.000-2.684), which showed that ID2 expression was significantly up-regulated in all AML (P<0.001, Figure 1).