Published in:
Open Access
01-08-2019 | PHASE I STUDIES
A phase 1 dose escalation and expansion study of Tarextumab (OMP-59R5) in patients with solid tumors
Authors:
David C. Smith, Rashmi Chugh, Amita Patnaik, Kyriakos P. Papadopoulos, Min Wang, Ann M. Kapoun, Lu Xu, Jakob Dupont, Robert J. Stagg, Anthony Tolcher
Published in:
Investigational New Drugs
|
Issue 4/2019
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Summary
Purpose This Phase I trial evaluated the maximum tolerated dose, safety, pharmacokinetics, pharmacodynamics and preliminary efficacy of tarextumab (OMP-5948), a novel cross-reactive antibody which binds and selectively inhibits signaling via both Notch2 and Notch3, in adult patients with advanced malignancies.
Methods Standard 3 + 3 design with tarextumab 0.5, 1, 2.5, or 5 mg/kg weekly, or 5, 7.5, or 10 mg/kg every other week, or 7.5 mg every 3 weeks. Dose-limiting toxicities (DLT) were assessed during the first 28 days.
Results Forty-two patients received tarextumab (21 weekly, 15 every other week, 6 every three weeks). 2/6 subjects at the 5 mg/kg weekly dose, 2/3 at 10 mg/kg every other week, and 0/6 at 7.5 mg/kg every three weeks had a DLT. The maximum tolerated dose (MTD) was 2.5 mg/kg weekly, and 7.5 mg/kg on the every other and every three week schedules. Gastrointestinal (GI) toxicity was the most common adverse event with diarrhea (81%), fatigue (48%), nausea (45%), anorexia (38%), and vomiting (38%) and abdominal pain and constipation (24% each). Biomarker analysis showed regulation of stem cell and Notch gene signaling.
Conclusion Tarextumab was generally well-tolerated at doses
<2.5 mg weekly and 7.5 mg/kg every other and every third week. Diarrhea was dose-limiting above these levels, but relatively easily managed at lower doses. Inhibition of Notch pathway signaling was demonstrated at these doses.
ClinicalTrials.gov Identifier: NCT01277146.