A Phase I trial of talazoparib in patients with advanced hematologic malignancies. 2021

Ajay K Gopal, and Rakesh Popat, and Ryan J Mattison, and Tobias Menne, and Adrian Bloor, and Terry Gaymes, and Asim Khwaja, and Mark Juckett, and Ying Chen, and Matthew J Cotter, and Ghulam J Mufti
Division of Medical Oncology, Department of Medicine, University of Washington, Seattle, Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.

OBJECTIVE The objective of this study was to establish the maximum tolerated dose (MTD), safety, pharmacokinetics, and anti-leukemic activity of talazoparib. METHODS This Phase I, two-cohort, dose-escalation trial evaluated talazoparib monotherapy in advanced hematologic malignancies (cohort 1: acute myeloid leukemia/myelodysplastic syndrome; cohort 2: chronic lymphocytic leukemia/mantle cell lymphoma). RESULTS Thirty-three (cohort 1: n = 25; cohort 2: n = 8) patients received talazoparib (0.1-2.0 mg once daily). The MTD was exceeded at 2.0 mg/day in cohort 1 and at 0.9 mg/day in cohort 2. Grade ≥3 adverse events were primarily hematologic. Eighteen (54.5%) patients reported stable disease. CONCLUSIONS Talazoparib is relatively well tolerated in hematologic malignancies, with a similar MTD as in solid tumors, and shows preliminary anti leukemic activity.Clinical trial registration: NCT01399840 (ClinicalTrials.gov).

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