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

Cancer
Breast Cancer

For Medical Professional
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Basic Details

Sponsor Genentech, Inc.

Phase Phase 1/Phase 2

Trial Identifier NCT07100106, GO46021, 2025-521128-31-00

Condition Breast Cancer

Official Title 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

Study 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 Criteria

Gender

All

Age

≥18 Years

Healthy Volunteers

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 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

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 anti-cancer therapies, including investigational therapies, within 28 days or 5 drug elimination half -lives, whichever is shorter, prior to initiation of study drug. Treatment with an approved oral endocrine therapy (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.
Poor peripheral venous access
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.

This page summarises information from public registry websites, such as ClinicalTrials.gov, EuClinicalTrials.eu, ISRCTN.com, etc. To learn more about this study, see the For Medical Professional tab or visit one of those websites.

The information is taken directly from public registry websites such as ClinicalTrials.gov, EuClinicalTrials.eu, ISRCTN.com, etc., and has not been edited.

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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

Basic Details

Study Summary

Eligibility Criteria

Inclusion Criteria

Exclusion Criteria

What is Clinical Research?

For the latest version of this information please go to www.forpatients.roche.com

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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

For the latest version of this information please go to www.forpatients.roche.com