Clinical trial · Interventional
A Study Evaluating the Efficacy and Safety of Inavolisib Plus CDK4/6 Inhibitor and Letrozole vs Placebo + CDK4/6i and Letrozole in Participants With Endocrine-Sensitive PIK3CA-Mutated, Hormone Receptor-Positive, HER2-Negative Advanced Breast Cancer
A Phase III, Multicenter, Randomized, Double-Blind, Placebo-Controlled Study Evaluating the Efficacy and Safety of Inavolisib Plus a CDK4/6 Inhibitor and Letrozole Versus Placebo Plus a CDK4/6 Inhibitor and Letrozole in Patients With Endocrine-Sensitive PIK3CA-Mutated, Hormone Receptor-Positive, HER2-Negative Advanced Breast Cancer
- Source
- ClinicalTrials.gov
- Retrieved
- Sep 8, 2026
- Layer
- normalized (units and labels harmonized; values unchanged)
- Run
- ING-CLINICALTRIALS-20260908-000001
Summary
Brief summary (as posted)
This study will evaluate the efficacy and safety of the combination of inavolisib plus a cyclin-dependent kinase 4 and 6 inhibitor (CDK4/6i) and letrozole versus placebo plus a CDK4/6i and letrozole in the first-line setting in participants with endocrine-sensitive PIK3CA-mutated hormone receptor-positive (HR+), human epidermal growth factor receptor 2-negative (HER2-), advanced breast cancer (ABC).
Conditions
Conditions (1)
Free-text conditions as registered, with the CancerIndex entity they were reconciled to and the match type.
| Condition (as posted) | Mapped entity | Match | Confidence |
|---|---|---|---|
| Breast Cancer | Malignant Breast Neoplasm | CURATED_EXACT | 0.92 |
Interventions
Interventions (4)
| Intervention | Type | Mapped drug | Match |
|---|---|---|---|
| CDK4/6i | Drug | — | UNRESOLVED |
| Inavolisib | Drug | Inavolisib | ALIAS |
| Letrozole | Drug | Letrozole | ALIAS |
| Placebo | Drug | — | UNRESOLVED |
Design
Arms and outcomes
Arms (2)
- type
- EXPERIMENTAL
- label
- Inavolisib + Letrozole + CDK4/6i
- description
- Participants will receive inavolisib, letrozole and CDK4/6i.
- interventionNames
- Drug: Inavolisib
- Drug: CDK4/6i
- Drug: Letrozole
- type
- PLACEBO_COMPARATOR
- label
- Placebo + Letrozole + CDK4/6i
- description
- Participants will receive placebo, letrozole and CDK4/6i.
- interventionNames
- Drug: Placebo
- Drug: CDK4/6i
- Drug: Letrozole
Primary outcomes (1)
- measure
- Progression-Free Survival (PFS)
Eligibility
Eligibility (as posted)
- Sex
- All
- Minimum age
- 18 Years
Show eligibility criteria text
Inclusion Criteria: * Women or men with histologically or cytologically confirmed carcinoma of the breast * Documented ER-positive and/or progesterone receptor-positive tumor according to American Society of Clinical Oncology/College of American Pathologists (ASCO/CAP) guidelines * Documented HER2-negative tumor according to ASCO/CAP guidelines * De-novo HR+ , HER2- ABC, or, alternatively, relapsed HR+ , HER2- ABC after at least 2 years of standard neoadjuvant/adjuvant endocrine therapy without disease progression during that treatment and disease-free interval of at least 1 year since the completion of that treatment * Participants who have bilateral breast cancers which are both HR-positive and HER2-negative * Confirmation of biomarker eligibility * Consent to provide fresh or archival tumor tissue specimen * Measurable 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 * Adequate hematologic and organ function within 14 days prior to initiation of study treatment Exclusion Criteria: * Pregnant or breastfeeding, or intention of becoming pregnant during the study or within the time frame in which contraception is required * Metaplastic breast cancer * Any prior systemic therapy for locally advanced unresectable or metastatic breast cancer * Type 2 diabetes requiring ongoing systemic treatment at the time of study entry; or any history of Type 1 diabetes * Any history of leptomeningeal disease or carcinomatous meningitis * Known and untreated, or active CNS metastases. Participants with a history of treated CNS metastases are eligible * Active inflammatory or infectious conditions in either eye or history of idiopathic or autoimmune-associated uveitis in either eye * Symptomatic active lung disease * History of or active inflammatory bowel disease * Any active bowel inflammation * Prior hematopoietic stem cell or bone marrow transplantation * Treatment with strong cytochrome P450 (CYP) 3A4 inhibitors or strong CYP3A4 inducers within 4 weeks or 5 drug-elimination half-lives, prior to initiation of study treatment
References
Publications (0)
Data not yet available