TACTIVE-U: A Study to Learn About the Study Medicine (Vepdegestrant) When Given With Other Medicines in People With Advanced or Metastatic Breast Cancer (Sub-Study B)
Public ClinicalTrials.gov record NCT05573555. 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
TACTIVE-U: AN INTERVENTIONAL SAFETY AND EFFICACY PHASE 1B/2, OPEN-LABEL UMBRELLA STUDY TO INVESTIGATE TOLERABILITY, PK, AND ANTITUMOR ACTIVITY OF VEPDEGESTRANT (ARV-471/PF-07850327), AN ORAL PROTEOLYSIS TARGETING CHIMERA, IN COMBINATION WITH OTHER ANTICANCER TREATMENTS IN PARTICIPANTS AGED 18 YEARS AND OVER WITH ER+ ADVANCED OR METASTATIC BREAST CANCER, SUB-STUDY B (ARV-471 IN COMBINATION WITH RIBOCICLIB)
Study identification
- NCT ID
- NCT05573555
- Recruitment status
- Active, not recruiting
- Study type
- Interventional
- Phase
- Phase 1, Phase 2
- Lead sponsor
- Pfizer
- Industry
- Enrollment
- 20 participants
Conditions and interventions
Conditions
Interventions
- ARV-471 Drug
- Ribociclib Drug
Drug
Eligibility (public fields only)
- Age range
- 18 Years and older
- Sex
- All
- 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
- Feb 28, 2023
- Primary completion
- Dec 29, 2026
- Completion
- Dec 29, 2026
- Last update posted
- Mar 8, 2026
2023 – 2026
United States locations
- U.S. sites
- 20
- U.S. states
- 5
- U.S. cities
- 10
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| Stanford Women's Cancer Center | Palo Alto | California | 94304 | — |
| UCSF Medical Center at Mission Bay | San Francisco | California | 94158 | — |
| Moffitt Cancer Center - International Plaza | Tampa | Florida | 33607 | — |
| Moffitt Cancer Center, Richard M. Shulze Family Foundation Outpatient Center | Tampa | Florida | 33612 | — |
| Moffitt Cancer Center | Tampa | Florida | 33612 | — |
| Moffitt McKinley Hospital | Tampa | Florida | 33612 | — |
| Siteman Cancer Center - WUPI | Shiloh | Illinois | 62269 | — |
| Brigham and Women's Hospital | Boston | Massachusetts | 02115 | — |
| Dana-Farber Cancer Institute | Boston | Massachusetts | 02215 | — |
| Dana-Farber Cancer Institute - Chestnut Hill | Newton | Massachusetts | 02459 | — |
| Siteman Cancer Center - St Peters | City of Saint Peters | Missouri | 63376 | — |
| Siteman Cancer Center - West County | Creve Coeur | Missouri | 63141 | — |
| Siteman Cancer Center - North County | Florissant | Missouri | 63031 | — |
| Siteman Cancer Center | St Louis | Missouri | 63108 | — |
| Barnes Jewish Hospital Department of Laboratories | St Louis | Missouri | 63110 | — |
| Barnes-Jewish Hospital | St Louis | Missouri | 63110 | — |
| Washington University School of Medicine - Siteman Cancer Center | St Louis | Missouri | 63110 | — |
| Washington University School of Medicine | St Louis | Missouri | 63110 | — |
| Barnes Jewish Hospital Lab- South County | St Louis | Missouri | 63129 | — |
| Siteman Cancer Center - South County | St Louis | Missouri | 63129 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
Non-U.S. locations
This page focuses on the U.S. directory. The official record also lists 9 non-U.S. sites.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT05573555, 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 Mar 8, 2026 · Synced May 16, 2026
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Open the official record
The complete protocol, eligibility criteria, and contact information for NCT05573555 live on ClinicalTrials.gov.