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Phase II Front-line Ponatinib in Adult Philadelphia+/BCR-ABL+ Acute Lymphoblastic Leukemia.

NCT01641107 · Status: COMPLETED · Phase: PHASE2 · Type: INTERVENTIONAL · Enrollment: 44

Last updated 2021-11-30

No results posted yet for this study

Summary

Drug resistance resulting from emergence of Imatinib-resistant BCR-ABL clones is a significant problem in Ph positive ALL patients because after a very good initial response to one TKI inhibitor, many patients relapse within one year, relapse being almost always associated with a BCR-ABL kinase domain point mutation. The patients who relapse after treatment with one TKI can be rescued to remission with another TKI, but the second remission is usually shorter than the previous one. A more potent TKI inhibitor, and pan-active not only on all the BCR-ABL variants (including the second generation TKI resistant T315I mutant), but also on others molecular targets can do better. In this context, Ponatinib is a novel synthetic orally active tyrosine kinase inhibitor (TKI), specifically developed to inhibit BCR-ABL, the fusion protein that is the product of the Philadelphia chromosome (Ph) in chronic myeloid leukemia (CML) and in a subset of acute lymphoblastic leukemia (Ph+ ALL). It potently inhibits the BCR-ABL protein as well as mutated forms of the protein that arise in patients resistant to prior therapies with TKIs. Ponatinib has been demonstrated to inhibit all the mutations that have been detected so far, in vitro and in vivo and to uniformly suppress the emerge of single-mutant clones in a mutagenesis assay. In the Phase II study, 41% of Philadelphia chromosome positive acute lymphoblastic leukemia patients treated with Ponatinib achieved major hematologic response, 47% had a major cytogenetic response, 38% obtained a complete cytogenetic response, showing that Ponatinib provides significant benefit despite previous intolerance or refractoriness to other TKIs. The Phase I trial showed that patients with a more recent diagnosis had increased rates of major molecular response: 79% for 14 patients with 0 to 5 years since diagnosis vs. 29% for 14 patients with more than 5 to 9 years since diagnosis (P=0.02) and 27% for 15 patients with more than 9 to 24 years since diagnosis (P=0.009). These characteristics support the hypothesis for a role of Ponatinib not only in patients resistant to prior TKI therapy but also in untreated ALL Ph+ patients, in order to prevent the emergence of resistant caused by the selection of mutated Ph+ clones and in order to avoid rapid progression of the disease.

Conditions

Interventions

DRUG

Ponatinib

Treatment: Patients will receive daily oral administration of Ponatinib at a dose of 45 mg/day for 6 weeks (defined as one course) for 8 courses, same dose and schedule, for a total of 48 weeks. Each patient will be followed for the subsequent 24 months, every 3 month, providing survival information and monitoring serious adverse event. Each patient should be treated for a minimum of 6 weeks. Patients must be discontinued from the trial in the event of myocardial infarction or stroke, or for development or progression of arterial disease necessitating revascularization. Once a complete hematologic response has been achieved, with a platelet count ≥ 50x109/L, patients can be treated with aspirin and/or a statin as clinically indicated, at investigator discretion.

Sponsors & Collaborators

Principal Investigators

  • Michele Baccarani, Pr. · Dpt of Hematology and Oncology "Seràgnoli", "Sant'Orsola-Malpighi" University Hospital of Bologna

Study Design

Allocation
NA
Purpose
TREATMENT
Masking
NONE
Model
SINGLE_GROUP

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2014-12-04
Primary Completion
2020-04-24
Completion
2021-09-30

Countries

  • Italy

Study Locations

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Diseases
Companies

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT01641107 on ClinicalTrials.gov