CD34 and chronic myelogenous leukemia, BCR-ABL1 positive: Although ABT-737 at low nM was not very active by itself, when combined with nutlin3a, synergistically increased apoptosis in proliferating (CI = 0.39 ± 0.06) and even more so in quiescent (CI = 0.13 ± 0.06) CD34+ CML BC cells.