A Phase Ib/II Multicenter, Open-Label, Randomized Study Evaluating the Safety, Pharmacokinetics, and Activity of GDC-4198 Alone and in Combination With Giredestrant in Comparison With Abemaciclib and Giredestrant in Participants With Locally Advanced or Metastatic Estrogen Receptor-Positive, HER2-Negative Breast Cancer Who Have Previously Progressed During or After a CDK4/6 Inhibitor
Status: Recruiting
Location: See all (9) locations...
Intervention Type: Drug
Study Type: Interventional
Study Phase: Phase 1/Phase 2
SUMMARY
The purpose of this study is to assess the safety of GDC-4198 alone and in combination with giredestrant and also the efficacy of GDC-4198 + giredestrant versus abemaciclib + giredestrant in participants with locally advanced or metastatic ER+, HER2- breast cancer. The study consists of 2 phases: Phase Ib and Phase II. Phase Ib will evaluate the safety and pharmacokinetics (PK) of GDC-4198 alone and in combination with giredestrant. Phase II stage will compare the activity and safety of GDC-4198 and giredestrant with abemaciclib and giredestrant.
Eligibility
Participation Requirements
Sex: All
Minimum Age: 18
Healthy Volunteers: f
View:
• Histologically and/or cytologically confirmed adenocarcinoma of the breast that is locally advanced or metastatic.
• Previously documented ER+ and HER2- tumor according to American Society of Clinical Oncology (ASCO)/ College of American Pathologists (CAP) or European Society of Medical Oncology (ESMO) guidelines or any national guidelines with criteria conforming to ASCO/CAP or ESMO guidelines.
• Disease progression during or after treatment with an approved cyclin-dependent kinase 4/6 (CDK4/6) inhibitor and endocrine therapy (ET) in the locally advanced or metastatic setting.
• Measurable or non-measurable evaluable, disease per Response Evaluation Criteria in Solid Tumors version 1.1 (RECIST v1.1)
• Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1
• Life expectancy ≥ 6 months
Locations
United States
California
City of Hope
RECRUITING
Duarte
City of Hope - Orange County Lennar Foundation Cancer Center
RECRUITING
Irvine
Georgia
Winship Cancer Institute of Emory University
RECRUITING
Atlanta
Illinois
City of Hope® Cancer Center Chicago
RECRUITING
Zion
New Jersey
Rutgers Cancer Institute of New Jersey
RECRUITING
New Brunswick
New York
New York Cancer & Blood Specialists
RECRUITING
East Patchogue
Other Locations
Australia
Cancer Research SA
RECRUITING
Adelaide
St Vincent's Hospital Sydney
RECRUITING
Darlinghurst
Canada
Princess Margaret Hospital
RECRUITING
Toronto
Contact Information
Primary
Reference Study ID Number: GO46021 https://forpatients.roche.com/
global-roche-genentech-trials@gene.com
888-662-6728 (U.S. Only)
Time Frame
Start Date:2025-10-07
Estimated Completion Date:2030-07-31
Participants
Target number of participants:285
Treatments
Experimental: Phase Ib: Dose-Finding Stage
Participants will receive GDC-4198 as monotherapy and in combination with giredestrant, 30 milligrams (mg), orally, daily, as per a pre-defined dosing regimen during each cycle until unacceptable toxicity or disease progression and/or loss of clinical benefit. (1 cycle=28 days).
Experimental: Phase II: Arm A
Participants will receive GDC-4198, higher dose, in combination with giredestrant, 30 mg, orally, daily, as per a pre-defined dosing regimen during each cycle until unacceptable toxicity or disease progression and/or loss of clinical benefit. (1 cycle=28 days).
Experimental: Phase II: Arm B
Participants will receive GDC-4198, lower dose, in combination with giredestrant, 30 mg, orally, daily, as per a pre-defined dosing regimen during each cycle until unacceptable toxicity or disease progression and/or loss of clinical benefit. (1 cycle=28 days).
Experimental: Phase II: Arm C
Participants will receive abemaciclib, 150 mg twice daily, in combination with giredestrant, 30 mg, orally, daily, as per a pre-defined dosing regimen during each cycle until unacceptable toxicity or disease progression and/or loss of clinical benefit. (1 cycle=28 days).