The β values of the 20 CpG sites were then averaged as the DNA methylation level of PCDH17 gene, which was significantly higher in AML patients (n = 107; median, 0.3219; range, 0.0303-0.9542; P < 0.0001) compared with the healthy controls (n = 25; median, 0.0649; range, 0.0302-0.9372) (Fig. 3b). This evidence concerns the gene PCDH17 and acute myeloid leukemia.