CLINICAL TRIAL, PHASE I
CLINICAL TRIAL, PHASE II
JOURNAL ARTICLE
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Ponatinib in Japanese patients with Philadelphia chromosome-positive leukemia, a phase 1/2 study.

In this ongoing Phase 1/2 study (NCT01667133), we evaluated ponatinib and assessed its recommended dose in Japanese patients with chronic myeloid leukemia (CML) resistant/intolerant to dasatinib or nilotinib, or with Philadelphia chromosome-positive acute lymphoblastic leukemia (Ph+ ALL) resistant/intolerant to ≥1 tyrosine kinase inhibitor (TKI). The primary endpoints were safety of the recommended dose (Phase 1) and major cytogenetic response (MCyR) by 12 months in chronic-phase CML (CP-CML) patients or major hematologic response (MaHR) by 6 months in patients with advanced phase disease (Phase 2). MCyR was achieved/maintained by 12 months in 65% of CP-CML patients; MaHR was achieved by 6 months in 61% of patients with advanced phase disease. The most common nonhematologic grade 3/4 treatment-emergent adverse event (AE) was hypertension (37%); common hematologic grade 3/4 AEs were thrombocytopenia (57%), neutropenia (34%), and leukopenia (26%). Overall, five (14%) patients experienced arterial occlusive events (AOEs); no grade 5 AOEs were reported. The steady-state accumulation ratio of ponatinib (based on area under the curve) ranged from 2.6 (15 mg/day) to 1.3 (45 mg/day). In summary, ponatinib demonstrated efficacy in Japanese patients with CML and Ph+ ALL resistant/intolerant to prior TKI treatment; safety data support a recommended starting dose of 45 mg/day in these patients.

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