Taken together, our results indicate that administration of CUDC-907, a dual PI3K and HDAC inhibitor, may be an effective strategy against ABL TKI-resistant cells, including cells harboring the T315I mutation. Lastly, CUDC-907 treatment also inhibited the growth of Ba/F3 ponatinib-resistant cells, K562 nilotinib-resistant cells, and T315I mutant primary samples.