We deepened the analysis of the apoptotic death triggered by BK124.1 into the subpopulations of CML CD34+ cells distinguished by double labeling with anti-CD34 and anti-CD38 antibodies, particularly focusing on the CML CD34+/38− cells corresponding to leukemia stem cells (Figure 6). The gene discussed is CD34; the disease is chronic myelogenous leukemia, BCR-ABL1 positive.