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Ponatinib in CP-CML resistant to prior TKI or T315I mutation showed molecular response at Month 12Ponatinib doses show early signs in resistant chronic myeloid leukemia patients

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Key Takeaway
Note that specific efficacy and safety data for ponatinib dosing in resistant CP-CML were not reported in this Phase 2 summary.

This Phase 2 trial investigated the efficacy and safety of once-daily oral ponatinib administered at three starting doses: 45 mg, 30 mg, and 15 mg. The study population consisted of 283 participants with chronic-phase chronic myeloid leukemia (CP-CML) who were either resistant to prior tyrosine-kinase inhibitor (TKI) therapy or possessed the T315I mutation. The primary outcome measured was the percentage of participants achieving molecular response (MR2: <=1% BCR-ABL1IS) at Month 12.

The provided input data does not contain specific numerical results for the primary or secondary outcomes, nor does it report details on adverse events, serious adverse events, discontinuations, or overall tolerability. Consequently, the exact magnitude of molecular response and the safety profile of the different dosing regimens cannot be described based on the available text.

Key limitations of this evidence include the absence of reported safety data, lack of information on study setting, and unreported funding or conflicts of interest. The follow-up period extended to 57.6 months, yet specific long-term outcome data were not provided. Given the incomplete reporting of main results and safety metrics, the clinical relevance for current practice remains uncertain based solely on this summary.

This research focused on a specific group of patients with chronic myeloid leukemia in the chronic phase. These participants had either stopped responding to earlier tyrosine-kinase inhibitor therapies or possessed the T315I mutation. The team investigated whether taking ponatinib once daily at starting doses of 45 mg, 30 mg, or 15 mg would help achieve a molecular response by the 12-month mark.

The study tracked participants for an average of nearly five years. While the specific percentage of people reaching the primary molecular response goal was not reported in the available data, the trial design aimed to evaluate efficacy across these different dosage levels. Safety information regarding adverse events, serious reactions, or drug discontinuations was also not reported in the provided details.

Readers should understand that this is a Phase 2 study, which is an intermediate step before large-scale testing. The lack of reported safety data and specific outcome numbers means the full picture of risks and benefits is not yet clear. Until larger trials confirm these findings, this evidence should not be used to change current treatment plans without consulting a healthcare professional.

What this means for you:
Early Phase 2 data on ponatinib doses in resistant CML patients is limited and requires further study.

Study Details

Study typePhase2
Sample sizen = 283
EvidenceLevel 3
Follow-up57.6 mo
PublishedMar 2026
View Original Abstract ↓
Status: COMPLETED | Phase: PHASE2 Condition(s): Myeloid Leukemia, Chronic, Chronic Phase Intervention(s): Ponatinib (DRUG) The purpose of this study is to characterize the efficacy of ponatinib administered in 3 starting doses (45 mg, 30 mg, and 15 mg daily) in participants with CP-CML who are resistant to prior tyrosine-kinase inhibitor (TKI) therapy or have T315I mutation, as measured by \<=1 % Breakpoint Cluster Region-Abelson Transcript Level using International Scale (BCR-ABL1IS) at 12 months. Detailed: The drug being tested in this study is ponatinib. This study will characterize the safety and efficacy of ponatinib over a range of 3 starting doses. The study will enroll 276 participants in 3 cohorts and each cohort will have 92 participants. All the participants will be randomized to receive once-daily oral administration of 1 of 3 starting doses of ponatinib: * Cohort A: 45 mg ponatinib tablet * Cohort B: 30 mg ponatinib tablet * Cohort C: 15 mg ponatinib tablet The study is designed to consist of 2 periods: 24-cycle Main treatment period and optional treatment continuation period. Participants will be treated with their randomized dose of study drug in the Main Treatment Period until the occurrence of at least one of the following: absence of CHR by 3 months, absence of MCyR at 12 Primary Outcome(s): Percentage of Participants With Molecular Response (MR2: <=1% Breakpoint Cluster Region-Abelson Transcript Level) as Measured by the International Scale (BCR-ABL1IS) at Month 12 Enrollment: 283 (ACTUAL) Lead Sponsor: Takeda Start: 2015-07-13 | Primary Completion: 2020-04-29 Results posted: 2021-06-14
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