CI

At a glance

ClinicalIndex Comparison Record
Phase 3Active· 40 enrolled
Drug / intervention
Niraparib +1 moredrug
Likely dose
Not stated in record
Structured eligibility isn't available for this trial yet — see the full criteria in the Eligibility tab below.

Standardized by ClinicalIndex from the ClinicalTrials.gov record · verify against the source.

Search/NCT04915755
NCT04915755Phase 3Active

A Randomized Phase 3 Double-Blinded Study Comparing the Efficacy and Safety of Niraparib to Placebo in Participants With Either HER2-Negative BRCA-Mutated or Triple-Negative Breast Cancer With Molecular Disease Based on Presence of Circulating Tumor DNA After Definitive Therapy (ZEST)

GlaxoSmithKline·interventional·Posted Jun 7, 2021·Updated Jul 16, 2025

In Brief

A Phase 3 clinical trial evaluating Niraparib and Placebo for Neoplasms, Breast. Active but no longer recruiting, targeting 40 participants across 198 sites in 27 countries.

Detailed Summary

This study will assess the efficacy and safety of Niraparib in participants with either tumor mutation in the BRCA gene (tBRCAmut) HER2- breast cancer (Independent of hormone receptor \[HR\] status, including HR positive \[+\] and TNBC) or tumor BRCA wild type (tBRCAwt) TNBC with molecular disease based on the presence of circulating tumor Deoxyribonucleic acid (ctDNA) following surgery or completion of adjuvant therapy.

Study Details

Study Typeinterventional
Allocation--
Masking--
Primary Purpose--
CountriesArgentina, Australia, Austria, Belgium, Brazil, Canada, Chile, Finland, France, Germany, Hungary, Ireland, Israel, Italy, Japan, Mexico, Netherlands, Norway, Poland, Portugal, Romania, Russia, South Africa, Spain, Switzerland, United Kingdom, United States
Collaborators--

Timeline

Phase 3ActiveOverdue
20222023202420252026
First PostedJun 7, 2021
Enrollment StartJun 28, 2021
Primary CompletionJun 28, 2024
Study CompletionDec 31, 2025
TodayJul 2, 2026
Enrollment to primary: 3 yearsPosted 5.1 years ago

Interventions

Niraparibdrug

Niraparib will be administered.

Placebodrug

Matching placebo will be administered