The safety and efficacy of this agent(s), or use in this setting, has not been established or is subject to confirmation. For an agent(s) whose safety and efficacy has not been established or confirmed, future regulatory approval or commercial availability is not guaranteed.
Vepdegestrant is an investigational compound. Its safety and efficacy have not been established. * Vepdegestrant is being co-developed with Arvinas.
Active enrolling
United States, Argentina, Australia, Belgium, Brazil, Bulgaria, Canada, China, Czechia, Finland, France, Germany, Greece, Hungary, India, Israel, Italy, Japan, Korea, Republic of, Norway, Poland, Puerto Rico, Slovakia, South Africa, Spain, Sweden, Switzerland, Taiwan, Turkey, United Kingdom
EXPERIMENTAL: ARV-471
DRUG: ARV-471
orally, once daily on a 28-day continuous dosing scheduleACTIVE_COMPARATOR: Fulvestrant
DRUG: Fulvestrant
intramuscularly on Days 1 and 15 of Cycle 1 and then on Day 1 of each cycle starting from C2D1 (28-day cycle)Progression Free Survival (PFS)
Progression-free survival is defined as the time interval from the date of randomization to the date of first documented tumor progression determined by blinded independent central review (BICR) assessment as per Response Evaluation Criteria in Solid Tumors (RECIST 1.1) or death due to any cause, whichever come first.
From randomization date (every 8 weeks for the first 48 weeks and then every 12 weeks thereafter) to date of first documentation of progression OR death (approximately 2 years).
Overall survival (OS)
Overall survival is defined as the time interval from the date of randomization to the date of documented death due to any cause.
From randomization date (every 3 months) to date of death (approximately 3 years)
Objective Response Rate (ORR)
Objective response rate is defined as the proportion of participants who have a confirmed CR or PR, as best overall response assessed by BICR as per RECIST 1.1, from the date of randomization to the date of disease progression, death due to any cause, whichever occurs first.
From randomization date (every 8 weeks during the first 48 weeks and then every 12 weeks) to the date of progression OR death (approximately to 2 years).
Duration of response (DR)
Duration of response is defined as the time from first documented evidence of CR or PR until progressive disease (PD) as determined by BICR assessment as per RECIST 1.1 or death due to any cause, whichever occurs first.
From the date of the first objective response (every 8 weeks during the first 48 weeks and then every 12 week) to the date of disease progression or death (approximately to 2 years).
Clinical Benefit Rate
Clinical benefit rate is defined as the proportion of participants who have a confirmed CR, PR at any time, or SD or nonCR/non PD for at least 24 weeks determined by BICR assessment as per RECIST 1.1, from the date of randomization until disease progression, death due to any cause, whichever occurs first.
From randomization date (every 8 weeks during the first 48 weeks and then every 12 weeks) to the date of progression or death (approximately to 2 years).
Number of participants with treatment emergent adverse events (TEAEs), serious adverse events (SAEs), electrocardiogram (ECG) and laboratory abnormalities
Incidence of participants with TEAEs, SAEs ECGs and laboratory abnormalities. TEAE/SAE and laboratory abnormalities will be graded according to NCI CTCAE V5.
From screening until 28 days after the last dose (approximately 2 years).
QT Interval (QTc)
Triplicate 12-lead electrocardiogram (ECG) measurements (each recording separated by approximately 2 minutes) are performed.
From baseline to end of treatment (approximately 2 years).
Plasma Concentration Versus Time of ARV-471
Plasma concentrations of ARV-471
From randomization date up to cycle 7 (each cycle is 28 days).
Health state utility and health status will be assessed using the European Quality of Life Group questionnaire with 5 dimensions and 5 levels per dimension (EQ-5D-5L)
Change from baseline and time to deterioration between treatment comparison in Quality of Life using the EQ-5D 5L questionnaire.
From screening and every cycle until cycle 6 (each cycle is 28 days), and then every other cycle until 28 days after the last dose (approximately 2 years).
Disease-related Quality of Life will be assessed using the European Organization for Research and Treatment of Cancer (EORTC) core quality of life questionnaire (QLQ-C30)
Change from baseline and time to deterioration between treatment comparison in Quality of Life using the EORTC QLQ-C30 questionnaire.
From screening and every cycle until cycle 6 (each cycle is 28 days), and then every other cycle until 28 days after the last dose (approximately 2 years).
Disease- and treatment-related Quality of Life will be assessed using the European Organization for Research and Treatment of Cancer (EORTC) breast cancer module (QLQ-BR23) questionnaire
Change from baseline and time to deterioration between treatment comparison in Quality of Life Using the EORTC QLQ-BR23 (Breast) questionnaire.
From screening and every cycle until cycle 6 (each cycle is 28 days), and then every other cycle until 28 days after the last dose (approximately 2 years).
Clinical Pain and its impact on functioning will be assessed using Brief Pain Inventory Short Form (BPI-SF) questionnaire.
Change from baseline and time to deterioration between treatment comparison in Brief Pain Inventory Short Form questionnaire.
From screening and every cycle until cycle 6 (cycle=28 days) and then every other cycle until 28 days after the last dose (appr. 2 yrs).The modified BPI-SF (worst pain severity and pain interference) daily from baseline until the EOT (appr 2 yrs)
circulating deoxyribonucleic acid (DNA)
Quantitative changes from baseline
From baseline to end of treatment (approximately 2 years).
560
Sponsor: Pfizer
Collaborator: Arvinas Estrogen Receptor, Inc.
For more information, call or email the Pfizer Clinical Trial Contact Center:
When calling, please reference this study number:
NCT# stands for National Clinical Trial number. This is a unique identification code given to each clinical trial registered on ClinicalTrials.gov. The format is "NCT" followed by an 8-digit number (for example, NCT00000419). Also called the ClinicalTrials.gov identifier.
NCT05654623
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