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Study identifier: NCT05304962 Synced from ClinicalTrials.gov · July 29, 2026
● Recruiting

FIH Study of RGT-419B Alone and With Endocrine Therapy in HR-Positive, HER2-Negative Advanced/Metastatic Breast Cancer

Condition: Breast Cancer  ·  Sponsor: Regor Pharmaceuticals Inc.

PhasePhase 1
Planned participants64
Who can joinAll sexes, 18 Years to no upper limit
Healthy volunteersNo

About this study

This is a phase I, First-in-Human (FIH), open-label study to evaluate the safety, tolerability, pharmacokinetic (PK) profile, and preliminary efficacy of RGT-419B administered orally as monotherapy OR in combination with Hormonal Therapy in subjects with HR+, HER2- locally advanced and unresectable (Stage III) or metastatic (Stage IV) breast cancer whose disease has progressed during prior therapy with an approved CDK4/6i plus hormonal therapy.

This description comes directly from the study's public registry record.

Talk to the study team

Joanna Dojillo, MSc  ·  617-315-9070  ·  joanna.dojillo@regor.com

Regor Pharmaceuticals Central Office  ·  617-315-9070  ·  rgt-419b_01-101@regor.com

Always discuss trial participation with your own doctor first.

Locations (8)

University of California, San DiegoLa Jolla, California, United StatesRecruiting
University California, Los AngelesLos Angeles, California, United StatesRecruiting
Hem-Onc Associates of the Treasure CoastPort Saint Lucie, Florida, United StatesActive Not Recruiting
Moffitt Cancer CenterTampa, Florida, United StatesRecruiting
Emory UniversityAtlanta, Georgia, United StatesRecruiting
Massachusetts General HospitalBoston, Massachusetts, United StatesRecruiting
Washington University School of MedicineSt Louis, Missouri, United StatesRecruiting
New York Cancer and Blood SpecialistsPort Jefferson Station, New York, United StatesRecruiting

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Source record: clinicaltrials.gov/study/NCT05304962