Breast Cancer Clinical Trial
A Study of ARV-471 (PF-07850327) Plus Palbociclib Versus Letrozole Plus Palbociclib in Participants With Estrogen Receptor Positive, Human Epidermal Growth Factor Negative Advanced Breast Cancer
The purpose of this study is to understand the safety and effects of the study medicine ARV-471 (PF-07850327) given together with palbociclib in advanced breast cancer. In particular, the study will compare the combination of ARV-471 plus palbociclib to standard of care therapy (letrozole plus palbociclib). Both letrozole and palbociclib are medicines already used for treatment of breast cancer. ARV-471 is a new medicine under study.
This study is seeking participants who have breast cancer that:
Have a locally advanced or metastatic disease and cannot be fully cured by surgery or radiation therapy. A metastatic disease is when disease has spread to other parts of the body.
Is sensitive to hormonal therapy such as tamoxifen. This is called estrogen receptor positive disease.
Have not received any prior medicine for advanced disease. Example medications include tamoxifen or letrozole or exemestane.
The study will have an open-label SLI (study lead-in) before initiation of Phase 3 trial. During SLI, two dose levels of palbociclib in combination with ARV-471 will be explored in parallel. Assignment to the palbociclib dose is by chance. Half of the participant will receive one dose and the other half another palbociclib dose. The purpose of SLI is to determine the recommended Phase 3 dose of palbociclib to be administered in combination with ARV-471.
In the Phase 3, half of the participants will take ARV-471 plus palbociclib while the other half will take letrozole plus palbociclib. In both SLI and Phase 3, participants will take the study medicines by mouth, with food, once a day. Participants will take the study medicines until breast cancer increase in size or side effects become too severe. Side effects refer to unwanted reactions to medications. Participants will visit the study clinic about once every 4 weeks.
The purpose of this study is to demonstrate that ARV-471 in combination with palbociclib provides superior clinical benefit compared to letrozole in combination with palbociclib in participants with ER(+)/HER2(-) aBC who have not received any prior systemic anti-cancer therapies for their locoregionally advanced or metastatic disease. The study will have a Study Lead-in (SLI) and a Phase 3. In the SLI, 50 participants (approximately 25 each arm) will be randomly assigned on a 1:1 basis to one of the two dose levels (DLs). In the randomized Phase 3, approximately 1130 eligible participants (approximately 565 each arm) will be randomized in a 1:1 ratio to the Experimental Arm (ie, ARV-471 plus palbociclib at RP3D determined in the SLI) or Control Arm (ie, letrozole plus palbociclib at the registered doses). Randomization will be stratified by menopausal status at study entry, visceral disease and de novo metastatic disease.
Adult participants with loco-regional recurrent or metastatic disease not amenable to curative treatment
Confirmed diagnosis of ER+/HER2- breast cancer
No prior systemic treatment for loco-regional recurrent or metastatic disease
Measurable disease evaluable per Response Evaluation Criterion in Solid Tumors (RECIST) v.1.1 or non-measurable bone-only disease
Eastern Cooperative Oncology Group (ECOG) performance status 0-2
Phase 3 only: Participants should be willing to provide blood and tumor tissue
Disease recurrence while on, or within 12 months of completion of adjuvant endocrine therapy
Prior treatment with cyclin dependent kinase 4/6 inhibitors (CDK4/6i), fulvestrant, elacestrant and other investigational drugs including novel endocrine therapies, any selective estrogen receptor degraders (SERDs), covalent antagonists (SERCAs) and complete ER antagonists (CERANs).
Inadequate liver, kidney and bone marrow function
Impaired cardiovascular function or clinically significant cardiovascular diseases
Refractory nausea and vomiting, inability to swallow capsules and tablets whole, chronic gastrointestinal diseases, significant gastric (total or partial) or bowel resection that would preclude adequate absorption of study interventions.
Current use or anticipated need for food, herbal supplements or drugs that are known strong CYP3A4 inhibitors or inducers.
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There are 2 Locations for this study
Lakeland Florida, 33805, United States
Orange City Florida, 32763, United States
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