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Study identifier: NCT06016738 Synced from ClinicalTrials.gov · July 29, 2026
● Recruiting

OP-1250 (Palazestrant) vs. Standard of Care for the Treatment of ER+/HER2- Advanced Breast Cancer

Condition: Breast Cancer · Advanced Breast Cancer · Metastatic Breast Cancer  ·  Sponsor: Olema Pharmaceuticals, Inc.

PhasePhase 3
Planned participants510
Who can joinAll sexes, 18 Years to no upper limit
Healthy volunteersNo

About this study

This phase 3 clinical trial compares the safety and efficacy of palazestrant (OP-1250) to the standard-of-care options of fulvestrant or an aromatase inhibitor in women and men with breast cancer whose disease has advanced on one endocrine therapy in combination with a CDK4/6 inhibitor.

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

Talk to the study team

Olema Pharmaceuticals, Inc.  ·  415-651-7206  ·  OPERA-01@olema.com

Always discuss trial participation with your own doctor first.

Locations (233)

Clinical Trial SiteTucson, Arizona, United StatesRecruiting
Clinical Trial SiteFountain Valley, California, United StatesNot Yet Recruiting
Clinical Trial SiteGlendale, California, United StatesNot Yet Recruiting
Clinical Trial SiteLa Jolla, California, United StatesCompleted
Clinical Trial SiteLos Alamitos, California, United StatesRecruiting
Clinical Trial SiteLos Angeles, California, United StatesRecruiting
Clinical Trial SiteWhittier, California, United StatesRecruiting
Clinical Trial SiteAurora, Colorado, United StatesRecruiting
Clinical Trial SiteDenver, Colorado, United StatesRecruiting
Clinical Trial SiteGolden, Colorado, United StatesRecruiting
Clinical Trial SiteGrand Junction, Colorado, United StatesActive Not Recruiting
Clinical Trial SiteDanbury, Connecticut, United StatesRecruiting

+ 221 more locations — full list on the registry record.

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Source record: clinicaltrials.gov/study/NCT06016738