A Study to Evaluate the Effect of GDC-4198 Alone and in Combination With Giredestrant Versus Abemaciclib and Giredestrant in Participants With Locally Advanced or Metastatic Estrogen Receptor-Positive (ER+), Human Epidermal Growth Factor Receptor-Negative (HER2-) Breast Cancer (MoonROSE)
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
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.
Participants from Study RGT-419B_01-101 (NCT05304962) who are experiencing clinical benefit with GDC-4198, as determined by the investigator, may enroll in this study and continue receiving GDC-4198 at their current dose level following closure of Study RGT-419B_01-101.
Study Overview
Status
Status
Conditions
Conditions
Intervention / Treatment
Intervention / Treatment
Study Type
Study Type
Enrollment (Estimated)
Enrollment
Phase
Phase
- Phase 2
- Phase 1
Contacts and Locations
Study Contact
Study Contact
- Name: Fastest response: use the inquiry form. https://www.gene.com/contact-us/submit-medical-inquiry
Study Contact Backup
- Name: Reference Study ID Number: GO46021 https://forpatients.roche.com/ No attachments to email below.
- Phone Number: 888-662-6728 (U.S. Only)
- Email: global-roche-genentech-trials@gene.com
Study Locations
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New South Wales
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Darlinghurst, New South Wales, Australia, 2010
- Recruiting
- St Vincent's Hospital Sydney
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South Australia
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Adelaide, South Australia, Australia, 5000
- Recruiting
- Cancer Research SA
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São Paulo, Brazil, 01246-000
- Recruiting
- Instituto Do Câncer Do Estado de São Paulo Octávio Frias de Oliveira - ICESP
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São Paulo, Brazil, 01323-001
- Recruiting
- Beneficencia Portuguesa de Sao Paulo
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Pernambuco
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Recife, Pernambuco, Brazil, 50040-000
- Recruiting
- Hospital do Cancer de Pernambuco - HCP
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Rio Grande do Sul
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Ijuí, Rio Grande do Sul, Brazil, 98700-000
- Recruiting
- ONCOSITE Centro de Pesquisa Clínica Em Oncologia
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Porto Alegre, Rio Grande do Sul, Brazil, 90560-030
- Recruiting
- Hospital de Clinicas de Porto Alegre (HCPA) - PPDS
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Porto Alegre, Rio Grande do Sul, Brazil, 90035-074
- Recruiting
- Irmandade Da Santa Casa de Misericordia de Porto Alegre
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British Columbia
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Vancouver, British Columbia, Canada, V5Z 4E6
- Recruiting
- BC Cancer Vancouver Centre
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Ontario
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Toronto, Ontario, Canada, M5G 2M9
- Recruiting
- Princess Margaret Hospital
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Fuzhou, China, 350014
- Recruiting
- Fujian Cancer Hospital
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Nanning, China, 530201
- Recruiting
- Guangxi Cancer Hospital of Guangxi Medical University
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SD
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Jinan, SD, China, 250117
- Recruiting
- Shandong Cancer Hospital
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Shanghai Municipality
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Shanghai, Shanghai Municipality, China, 201321
- Recruiting
- Fudan University Shanghai Cancer Center - Pudong Campus
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Tianjin Municipality
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Tianjin, Tianjin Municipality, China, 300060
- Recruiting
- Tianjin Medical University Cancer Institute & Hospital
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Caen, France, 14076
- Recruiting
- Centre Francois Baclesse
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Lille, France, 59020
- Recruiting
- Centre Oscar Lambret
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Rennes, France, 35042
- Recruiting
- Centre Eugene Marquis
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Champagne-Ardenne
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Reims, Champagne-Ardenne, France, 51100
- Recruiting
- Institut Jean Godinot
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Val-de-Marne
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Villejuif, Val-de-Marne, France, 94805
- Recruiting
- Gustave Roussy
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Dresden, Germany, 01307
- Recruiting
- Universitaetsklinikum Carl Gustav Carus an der TU Dresden
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Hamburg, Germany, 20251
- Recruiting
- Universitatsklinikum Hamburg-Eppendorf
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Heidelberg, Germany, 69120
- Recruiting
- Uniklinikum Heidelberg
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Baden-Wurttemberg
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Tübingen, Baden-Wurttemberg, Germany, 72076
- Recruiting
- Universitatsklinikum Tubingen
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Lower Saxony
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Hanover, Lower Saxony, Germany, 30625
- Recruiting
- Medizinische Hochschule Hannover
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North Rhine-Westphalia
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Essen, North Rhine-Westphalia, Germany, 45136
- Recruiting
- KEM - Evang. Huyssens-Stiftung Essen-Huttrop
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Emilia-Romagna
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Bologna, Emilia-Romagna, Italy, 40138
- Recruiting
- Azienda Ospedaliero Universitaria Di Bologna_Policlinico S Orsola Malpighi-Via Albertoni
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Meldola, Emilia-Romagna, Italy, 47014
- Recruiting
- Istituto Romagnolo per lo Studio dei Tumori Dino Amadori - IRST S.r.l - PPDS
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Lombardy
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Bergamo, Lombardy, Italy, 24127
- Recruiting
- Asst Papa Giovanni XXIII
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Brescia, Lombardy, Italy, 25123
- Recruiting
- ASST degli Spedali Civili di Brescia - Spedali Civili di Brescia
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Milan, Lombardy, Italy, 20132
- Recruiting
- Ospedale San Raffaele S.r.l. - PPDS
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Seongnam-si, South Korea, 13620
- Recruiting
- Seoul National University Bundang Hospital
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Seoul, South Korea, 03080
- Recruiting
- Seoul National University Hospital
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Seoul, South Korea, 06351
- Recruiting
- Samsung Medical Center
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Seoul, South Korea, 6591
- Recruiting
- The Catholic University of Korea, Seoul St. Mary's Hospital
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Seoul, South Korea, 3722
- Recruiting
- Severance Hospital, Yonsei University Health System
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Seoul, South Korea, 05505
- Recruiting
- Asan Medical Center.
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Seoul Teugbyeolsi
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Seoul, Seoul Teugbyeolsi, South Korea, 6273
- Recruiting
- Gangnam Severance Hospital, Yonsei University Health System
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Barcelona, Spain, 08035
- Recruiting
- Instituto de Investigacion Oncologica Vall dHebron (VHIO) - EPON
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Madrid, Spain, 28041
- Recruiting
- Hospital Universitario 12 de Octubre
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Madrid, Spain, 28007
- Recruiting
- Hospital Beata Maria Ana
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Madrid, Spain, 28007
- Recruiting
- Hospital General Universitario Gregorio Maranon
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Valencia, Spain, 46010
- Recruiting
- Hospital Clinico Universitario de Valencia
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Barcelona
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L'Hospitalet de Llobregat, Barcelona, Spain, 08908
- Recruiting
- ICO l?Hospitalet ? Hospital Duran i Reynals
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Alabama
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Huntsville, Alabama, United States, 35805-2606
- Recruiting
- Clearview Cancer Institute - Huntsville
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Arizona
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Tucson, Arizona, United States, 85724-0001
- Recruiting
- University of Arizona Cancer Center
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California
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Duarte, California, United States, 91010
- Recruiting
- City of Hope
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Irvine, California, United States, 92618
- Recruiting
- City of Hope - Orange County Lennar Foundation Cancer Center
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La Jolla, California, United States, 92093-1503
- Recruiting
- UC San Diego Moores Cancer Center
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San Diego, California, United States, 92103-1911
- Recruiting
- University of California San Diego Medical Center
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San Francisco, California, United States, 94158
- Recruiting
- UCSF Helen Diller Family CCC
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Colorado
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Aurora, Colorado, United States, 80124-5316
- Recruiting
- University of Colorado Cancer Center
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Florida
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Miami, Florida, United States, 33136-1002
- Recruiting
- Sylvester Comprehensive Cancer Center
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Tampa, Florida, United States, 33612
- Recruiting
- Moffitt Cancer Center
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Georgia
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Atlanta, Georgia, United States, 30322-1013
- Recruiting
- Winship Cancer Institute of Emory University
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Illinois
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Zion, Illinois, United States, 60099
- Recruiting
- City of Hope® Cancer Center Chicago
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Maine
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Detroit, Maine, United States, 48201-2013
- Recruiting
- Barbara Ann Karmanos Cancer Institute
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Maryland
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Annapolis, Maryland, United States, 21401
- Recruiting
- Maryland Oncology Hematology - Annapolis
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Massachusetts
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Boston, Massachusetts, United States, 02114
- Recruiting
- Massachusetts General Hospital
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Missouri
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St Louis, Missouri, United States, 63110-1010
- Recruiting
- Washington University Siteman Cancer Center
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New Jersey
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New Brunswick, New Jersey, United States, 08901-1914
- Recruiting
- Rutgers Cancer Institute of New Jersey
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New York
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East Patchogue, New York, United States, 11772
- Recruiting
- New York Cancer & Blood Specialists
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The Bronx, New York, United States, 10461
- Recruiting
- Montefiore Einstein Cancer Center
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North Carolina
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Charlotte, North Carolina, United States, 28204
- Recruiting
- Levine Cancer Institute
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Charlotte, North Carolina, United States, 28204
- Recruiting
- Novant Health Cancer Institute
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Winston-Salem, North Carolina, United States, 27103-3224
- Recruiting
- Novant Health Oncology Specialists
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Ohio
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Canton, Ohio, United States, 44708
- Recruiting
- Cleveland Clinic Mercy Hospital
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Cleveland, Ohio, United States, 44195-0001
- Recruiting
- Cleveland Clinic Taussig Cancer Center
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Oregon
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Eugene, Oregon, United States, 97401
- Recruiting
- Oncology Associates of Oregon, P.C
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Pennsylvania
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Hershey, Pennsylvania, United States, 17033-2360
- Recruiting
- Penn State Health Milton S. Hershey Medical Center
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Philadelphia, Pennsylvania, United States, 19104
- Recruiting
- University of Pennsylvania - Abramson Cancer Center
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Pittsburgh, Pennsylvania, United States, 15213-3108
- Recruiting
- UPMC - Hillman Cancer Center
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Tennessee
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Mount Juliet, Tennessee, United States, 37122
- Recruiting
- Tennesse Oncology - Mt. Juliet Clinic
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Nashville, Tennessee, United States, 37204-3609
- Recruiting
- Vanderbilt Breast Center at One Hundred Oaks
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Texas
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Dallas, Texas, United States, 75246-2003
- Recruiting
- Texas Oncology (Worth) - USOR
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Utah
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Salt Lake City, Utah, United States, 84013
- Recruiting
- University of Utah Huntsman Cancer Institute
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Virginia
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Norfolk, Virginia, United States, 23502-2800
- Recruiting
- Virginia Oncology Associates (Norfolk) - USOR
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Participation Criteria
Eligibility Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- 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 approved 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.
- Current participant enrolled in Study RGT-419B_01-101 who is experiencing clinical benefit from GDC-4198, as determined by the investigator, at the time of consent and enrollment in this study.
Exclusion Criteria:
- Advanced, symptomatic, visceral spread that is at risk of life-threatening complications in the short term appropriate for treatment with cytotoxic chemotherapy at time of entry into the study, as per national or local treatment guidelines.
- Have received more than one-line of therapy for locally advanced or metastatic disease.
- Have received prior chemotherapy for metastatic breast cancer.
- Treatment with an approved oral ET within 7 days prior to initiation of study drug; treatment with fulvestrant or an approved CDK4/6 inhibitor within 21 days prior to initiation of study drug.
- Malabsorption condition or other gastrointestinal (GI) conditions/surgeries that the investigator assesses may significantly interfere with enteral absorption
- History of malignancy within 3 years prior to screening, except for cancer under investigation in this study and malignancies with a negligible risk of metastasis or death.
- Known allergy or hypersensitivity to any component of the study treatments.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Sequential Assignment
- Masking: None (Open Label)
Number of Arms
Arms and Interventions
Participant Group / ArmParticipant Group / Arm |
Intervention / TreatmentIntervention / Treatment |
|---|---|
|
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). Participants from study RGT-419B_01-101 will continue receiving GDC-4198 at their current dose level following closure of study RGT-419B_01-101. |
GDC-4198 will be administered orally.
Other Names:
Giredestrant will be administered orally.
Other Names:
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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). |
GDC-4198 will be administered orally.
Other Names:
Giredestrant will be administered orally.
Other Names:
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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). |
GDC-4198 will be administered orally.
Other Names:
Giredestrant will be administered orally.
Other Names:
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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). |
Giredestrant will be administered orally.
Other Names:
Abemaciclib will be administered orally. |
What is the study measuring?
Primary Outcome Measures
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
|---|---|---|
|
Phase Ib: Number of Participants With Dose-Limiting Toxicity (DLTs)
Time Frame: From Day 1 to Day 28 of Cycle 1 (1 cycle=28 days)
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From Day 1 to Day 28 of Cycle 1 (1 cycle=28 days)
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Phase II: Progression-free Survival (PFS)
Time Frame: Up to 36 months
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Up to 36 months
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Phase Ib: Incidence and Severity of Adverse Events (AEs)
Time Frame: Up to 36 months
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Severity of AEs determined according to the CTCAE v5.0 grading scale |
Up to 36 months
|
Secondary Outcome Measures
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
|---|---|---|
|
Phase Ib: Objective Response Rate (ORR)
Time Frame: Up to 36 months
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Up to 36 months
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Phase Ib: Clinical Benefit Rate (CBR)
Time Frame: Up to 36 months
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Up to 36 months
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Phase II: ORR
Time Frame: Up to 36 months
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Up to 36 months
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Phase II: Duration of Response (DOR)
Time Frame: Up to 36 months
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Up to 36 months
|
|
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Phase II: CBR
Time Frame: Up to 36 months
|
Up to 36 months
|
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Phase II: Overall Survival (OS)
Time Frame: Up to 36 months
|
Up to 36 months
|
|
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Phase II: OS Rate at 6 Months and 12 Months
Time Frame: Month 6, Month 12
|
Month 6, Month 12
|
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Phase II: PFS Rate at 6 Months and 12 Months
Time Frame: Month 6, Month 12
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Month 6, Month 12
|
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Phase II: Plasma Concentration of GDC-4198
Time Frame: Up to 36 months
|
Up to 36 months
|
|
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Phase II: Recommended Dose of GDC-4198
Time Frame: Up to 36 months
|
Up to 36 months
|
|
|
Phase II: Incidence and Severity of Adverse Events (AEs)
Time Frame: Up to 36 months
|
Severity of AEs determined according to the CTCAE v5.0 grading scale |
Up to 36 months
|
Collaborators and Investigators
Sponsor
Sponsor
Collaborators
Collaborators
Investigators
Investigators
- Study Director: Clinical Trials, Hoffmann-La Roche
Publications and helpful links
Study record dates
Study Major Dates
Study Start (Actual)
Study Start
Primary Completion (Estimated)
Primary Completion
Study Completion (Estimated)
Study Completion
Study Registration Dates
First Submitted
First Submitted
First Submitted That Met QC Criteria
First Submitted That Met QC Criteria
First Posted (Actual)
First Posted
Study Record Updates
Last Update Posted (Actual)
Last Update Posted
Last Update Submitted That Met QC Criteria
Last Update Submitted That Met QC Criteria
Last Verified
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
Other Study ID Numbers
- GO46021
- 2025-521128-31-00 (Ctis)
- 2025 (U.S. NIH Grant/Contract)
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
IPD Plan Description
For eligible studies, qualified researchers may request access to individual patient level clinical data. See Roche's commitment to transparency of clinical study information here: https://go.roche.com/data_sharing
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.