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Iniparib Administered Weekly or Twice-Weekly in Combination With gemcitabine/carboplatin in Patients With Metastatic Triple-Negative Breast Cancer: A Phase II Randomized Open-Label Study With Pharmacokinetics

Iniparib Administered Weekly or Twice-Weekly in Combination With gemcitabine/carboplatin in Patients With Metastatic Triple-Negative Breast Cancer: A Phase II Randomized Open-Label Study With Pharmacokinetics

Véronique Diéras, Hervé Bonnefoi, Emilio Alba, Ahmad Awada, Bruno Coudert, Xavier Pivot, Joseph Gligorov, Agnes Jager, Stefania Zambelli, Geoffrey J Lindeman, Eric Charpentier, Gary T Emmons, Ignacio Garcia-Ribas, etc.

Breast Cancer Res Treat. 2019 Sep;177(2):383-393.

PMID: 31172407

Abstract:

Purpose:
Metastatic triple-negative breast cancer (TNBC) is a phenotypic breast cancer subgroup with a very poor prognosis, despite standard treatments. Combined twice-weekly iniparib and gemcitabine/carboplatin (GC+tw-iniparib) showed benefit over gemcitabine/carboplatin in a randomized phase II trial, and a phase III was initiated comparing these regimens. The present phase II study was initiated to compare GC+tw-iniparib with a more practical once-weekly schedule (GC+w-iniparib) in TNBC.
Methods:
Metastatic TNBC patients were randomized to receive iniparib weekly (11.2 mg/kg on days 1 and 8) or twice-weekly (5.6 mg/kg on days 1, 4, 8, and 11) with gemcitabine (1000 mg/m2) and carboplatin (area under the curve 2 on days 1 and 8), every 3 weeks. The primary endpoint was the overall response rate (ORR). Pharmacokinetics of iniparib and its two metabolites were analyzed.
Results:
A total of 163 patients were randomized, 82 GC+w-iniparib and 81 GC+tw-iniparib. Demographic and baseline characteristics were well balanced. ORR was 34.1% (95% CI 23.9-44.4%) vs. 29.6% (95% CI 19.7-39.6%) and median progression-free survival was 5.5 months (95% CI 4.2-5.7) vs. 4.3 months (95% CI 3.0-5.8) for GC+w-iniparib and GC+tw-iniparib, respectively. Safety was similar across treatment arms in terms of event severity and type. Iniparib plasma concentrations and exposure were two-fold higher with w-iniparib compared to tw-iniparib. Iniparib and its metabolites were cleared rapidly with a terminal half-life of < 1 h, without accumulation.
Conclusions:
Despite a doubled maximum concentration with weekly iniparib, no detectable differences in safety or efficacy were observed between the weekly and twice-weekly administration schedules in this population.
Trial registration:
ClinicalTrial.gov Identifier NCT01045304.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP160003667	Iniparib		160003-66-7	Price

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