A positive association was found between the frequency of AML blasts and the level of BMP2 (P = 0.026, Figure 2F), but not the levels of TGF-β (P = 0.087, Figure 2E), BMP4 (P = 0.210, Figure 2G), and ActivinA (P = 0.689, Figure 2H). Here, BMP4 is linked to acute myeloid leukemia.