A Study to Evaluate Efficacy and Safety of Giredestrant Compared With Fulvestrant (Plus a CDK4/6 Inhibitor), in Participants With ER-Positive, HER2-Negative Advanced Breast Cancer Resistant to Adjuvant Endocrine Therapy (pionERA Breast Cancer)
Breast Cancer
Unknown Primary
18 Years and older, Male and Female
CO44657 (primary)
NCI-2024-00434
2022-502980-39-00
Summary
This is a Phase III, randomized, open-label multicenter study that will evaluate the
efficacy and safety of giredestrant compared with fulvestrant, both in combination with
the investigator's choice of a CDK4/6 inhibitor (palbociclib, ribociclib or abemaciclib),
in participants with estrogen receptor-positive (ER+), human epidermal growth factor
receptor 2-negative (HER2-) advanced breast cancer who have developed resistance to
adjuvant endocrine therapy.
Eligibility
- Locally advanced or metastatic adenocarcinoma of the breast, not amenable to treatment with curative intent
- Documented estrogen receptor-positive (ER+), HER2-negative (HER2-) tumor assessed locally on the most recent tumor biopsy (or archived tumor sample)
- Confirmed ESR1 mutation status (ESR1m vs. ESR1nmd) in baseline circulating tumor DNA (ctDNA) through central laboratory testing
- Resistance to prior adjuvant endocrine therapy (ET). Prior use of neo/adjuvant CDK4/6i is allowed.
- No prior systemic anti-cancer therapy for advanced disease
- Measurable disease as defined per RECIST v.1.1 or non-measurable bone-only disease
- Eastern Cooperative Oncology Group Performance Status (ECOG PS) 0-1
- For pre/perimenopausal women and for men: treatment with LHRH agonist therapy (as per local guidelines) for the duration of study treatment is required
Treatment Sites in Georgia
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