A Study of Letrozole, Palbociclib, and Onapristone ER in People With Metastatic Breast Cancer
Public ClinicalTrials.gov record NCT04872608. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Official title
ctDNA-guided Adaptive Therapy Escalation in ER+ MBC: A Phase 1b Study With Letrozole, Palbociclib and Onapristone ER
Brief summary
Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.
The researchers are doing this study to find out whether the study drug onapristone ER, combined with the standard treatment for your cancer (letrozole and palbociclib), is a safe treatment for people who have metastatic or unresectable ER+/PR+/HER2- breast cancer. The researchers will test different doses of the study drug to find the highest dose that causes few or mild side effects.
Study identification
- NCT ID
- NCT04872608
- Recruitment status
- Withdrawn
- Study type
- Interventional
- Phase
- Phase 1
- Enrollment
- Not listed
Conditions and interventions
Eligibility (public fields only)
- Age range
- 18 Years and older
- Sex
- Female
- Healthy volunteers
- Healthy volunteers not accepted
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Sep 8, 2021
- Primary completion
- Apr 24, 2023
- Completion
- Apr 24, 2023
- Last update posted
- Apr 27, 2023
2021 – 2023
United States locations
- U.S. sites
- 1
- U.S. states
- 1
- U.S. cities
- 1
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| Memorial Sloan Kettering Westchester (All Protocol Activities) | Harrison | New York | 10604 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT04872608, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Apr 27, 2023 · Synced Sep 2, 2026
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Open the official record
The complete protocol, eligibility criteria, and contact information for NCT04872608 live on ClinicalTrials.gov.