CD19 and acute myeloid leukemia: Frequencies of total CD19+ B-cells (ID80) were comparable between AML and HD (mean frequency ± SEM: 13.3% ± 7.3 vs. 14.5% ± 2.3, p = 0.8), and they ranged from 3.2 to 25.7% in AML and 5.9 to 28.4% in HD (Fig. 3a, left panel).