1. A phase 1b dose escalation study of ipafricept (OMP54F28) in combination with paclitaxel and carboplatin in patients with recurrent platinum-sensitive ovarian cancer.
- Author
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Moore KN, Gunderson CC, Sabbatini P, McMeekin DS, Mantia-Smaldone G, Burger RA, Morgan MA, Kapoun AM, Brachmann RK, Stagg R, Farooki A, and O'Cearbhaill RE
- Subjects
- Aged, Antineoplastic Agents, Phytogenic, Bone and Bones drug effects, Carboplatin administration & dosage, Dose-Response Relationship, Drug, Female, Humans, Immunoglobulin Fc Fragments adverse effects, Immunoglobulin Fc Fragments pharmacology, Maximum Tolerated Dose, Middle Aged, Paclitaxel administration & dosage, Recombinant Fusion Proteins adverse effects, Recombinant Fusion Proteins pharmacology, Wnt Signaling Pathway drug effects, Antineoplastic Combined Chemotherapy Protocols therapeutic use, Carcinoma, Ovarian Epithelial drug therapy, Immunoglobulin Fc Fragments administration & dosage, Ovarian Neoplasms drug therapy, Receptors, G-Protein-Coupled administration & dosage, Recombinant Fusion Proteins administration & dosage
- Abstract
Objectives: The WNT pathway is an important oncologic driver of epithelial ovarian cancer (EOC). The first-in-class recombinant fusion protein ipafricept (IPA) blocks Wnt signaling through binding of Wnt ligands. This phase Ib trial was designed to determine the maximum tolerated dose (MTD) and recommended phase 2 dose (RPh2) for IPA in combination with taxane and platinum therapy (C/P)., Methods: Dose escalation started with a standard 3 + 3 design for IPA/C/P with q3w intravenous IPA on Day 1, in cycles 1 to 6 with C (AUC = 5 mg/ml·min) and P (175 mg/m
2 ). For enhanced bone safety the trial was revised to 6-patient cohorts with a q3w regimen of IPA on Day 1 and C/P on Day 3 (IPA → C/P)., Results: 37 patients have been treated; 30 of whom were treated following protocol revision to q3w IPA(D1) → C/P(D3) (2 & 4 mg/kg). IPA-related TEAEs that occurred in ≥15% included: fatigue (40%); nausea (35%); diarrhea and decreased appetite (22%) each; dysgeusia (19%); and vomiting (16.2%). 22% reported ≥1 IPA related TEAE Grade ≥3 the most common of which was neutropenia at 16%. There were no DLTs; the MTD was not reached. The maximum administered dose based on bone safety was 6 mg/kg. The overall response rate (ORR) was 75.7%. Median PFS was 10.3 months (95% CI 8.5-14.2) and OS 33 months (95% CI 23.4-NR)., Conclusions: IPA is well tolerated in combination with sequential C/P. ORR, PFS and OS are comparable to historical data but bone toxicity at efficacy doses of this particular Wnt inhibitor limit further development in EOC., (Copyright © 2019 Elsevier Inc. All rights reserved.)- Published
- 2019
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