|Inclusion Criteria:||1) Diagnosis of Ph-positive (by cytogenetics or FISH) or BCR-ABL-positive (by PCR) CML in chronic phase.|
2) Patients should have demonstrated to have failure to therapy to one FDA-approved TKI (currently imatinib, dastinib, and nilotinib are approved as frontline therapy), defined as per European leukemiaNet (ELN) recommendations: 1. Less than complete hematologic response (CHR) at or beyond 3 months; 2. No cytogenetic response at or beyond 6 months; 3. Less than PCyR (Ph+ >35%) at or beyond 12 months; 4. Less than CCyR at or beyond 18 months; 5. Loss of response or development of mutations or other clonal chromosomal abnormalities at any time during imatinib treatment; 6. Intolerance to imatinib defined as grade 3 or 4 toxicity, or persistent grade 2 toxicity despite optimal management including dose adjustment, or in a patient where dose reductions are considered to be not in the patients best interest to obtain or maintain an adequate response. Intolerant patients should not have achieved or have lost major cytogenetic response at the time of enrollment.
3) Age >/= 18 years.
4) ECOG performance of 0-2.
5) Adequate end organ function, defined as the following: total bilirubin </= 1.5x ULN (unless due to Gilbert syndrome, in which case it should be </= 3.0x ULN), SGPT </= 2.5x ULN, creatinine </=1.5x ULN.
6) Patients must sign an informed consent indicating they are aware of the investigational nature of this study, in keeping with the policies of the hospital.
7) Reliable telephone access to receive calls from an interactive voice response system (IVR) (only applicable to patients who will participate in optional symptom burden assessment).
8) Women of pregnancy potential must practice an effective method of birth control during the course of the study, in a manner such that risk of failure is minimized: 1. Prior to study enrollment, women of childbearing potential (WOCBP) must be advised of the importance of avoiding pregnancy during trial participation & the potential risk factors for an unintentional pregnancy; 2. Postmenopausal women must be amenorrheic for at least 12 months to be considered of non-childbearing potential; 3. In addition, men enrolled on this study should understand the risks to any sexual partner of childbearing potential & should practice an effective method of birth control; 4. Women & men must continue birth control for the duration of the trial & at least 3 months after the last dose of study drug;
9) **continued from above: 5. All WOCBP MUST have a negative pregnancy test prior to first receiving investigational product. If the pregnancy test is positive, the patient must not receive investigational product & must not be enrolled in the study.
10) Patients should have discontinued therapy with imatinib or other anti-leukemia therapy (except hydroxyurea), at least 48 hours prior to start of study therapy and recovered from any toxicity due to these therapies to at least grade 1. The use of hydroxyurea is allowed immediately prior to study entry.