All three drugs are less toxic against CD34+ HSPC cord blood cells compared to CD34+ 8227 AML (LC50 for AML 8227 and cord blood were respectively: strophanthidin = 29.59 nM and 68.41 nM; digoxin = 29.57 nM and 43.40 nM and ouabain = 15.17 nM and 31.45 nM) (Fig. 5c). Here, CD34 is linked to acute myeloid leukemia.