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Study identifier: NCT05508906 Synced from ClinicalTrials.gov · July 28, 2026
● Recruiting

Phase 1b Study of OP-1250 (Palazestrant) in Combination With Ribociclib, Alpelisib, Everolimus, or Atirmociclib in ER+, HER2- Breast Cancer

Condition: Metastatic Breast Cancer · ER-positive Breast Cancer · HER2-negative Breast Cancer  ·  Sponsor: Olema Pharmaceuticals, Inc.

PhasePhase 1
Planned participants190
Who can joinAll sexes, 18 Years to no upper limit
Healthy volunteersNo

About this study

This is a Phase 1b open-label, 2-part study in 3 treatment groups. The 3 treatment groups are as follows: Treatment Group 1: Palazestrant (OP-1250) in combination with ribociclib (KISQALI®, Novartis Pharmaceuticals Corporation). Treatment Group 2: Palazestrant (OP-1250) in combination with alpelisib (PIQRAY®, Novartis Pharmaceuticals Corporation). Treatment Group 3: Palazestrant (OP-1250) in combination with everolimus. Treatment Group 4: Palazestrant (OP-1250) in combination with atirmociclib.

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

Talk to the study team

OP-1250-003 Study  ·  415 651 7206  ·  medinfo@olema.com

Always discuss trial participation with your own doctor first.

Locations (16)

Banner MD Anderson Cancer CenterGilbert, Arizona, United StatesRecruiting
University of California San Francisco HealthSan Francisco, California, United StatesRecruiting
University of Colorado Cancer CenterAurora, Colorado, United StatesRecruiting
Advent Health Hematology and OncologyOrlando, Florida, United StatesRecruiting
University of IowaIowa City, Iowa, United StatesRecruiting
Dana Farber Cancer InstituteBoston, Massachusetts, United StatesRecruiting
Henry Ford HealthDetroit, Michigan, United StatesRecruiting
Regents of the University of MinnesotaMinneapolis, Minnesota, United StatesRecruiting
Washington University, School of MedicineSt Louis, Missouri, United StatesRecruiting
Ichan School of Medicine at Mount SinaiNew York, New York, United StatesRecruiting
Atrium Health Levine Cancer InstituteCharlotte, North Carolina, United StatesRecruiting
Henry-Joyce Cancer Clinic, The Vanderbilt ClinicNashville, Tennessee, United StatesRecruiting

+ 4 more locations — full list on the registry record.

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Source record: clinicaltrials.gov/study/NCT05508906