Clinical trial · Interventional
Study to Assess the Efficacy and Safety of Alpelisib Plus Fulvestrant in Participants With HR-positive (HR+), HER2-negative, Advanced Breast Cancer After Treatment With a CDK4/6 Inhibitor and an Aromatase Inhibitor.
EPIK-B5: A Phase III, Randomized, Double-blind, Placebo-controlled Study of Alpelisib in Combination With Fulvestrant for Men and Postmenopausal Women With HR-positive, HER2-negative Advanced Breast Cancer With a PIK3CA Mutation, Who Progressed on or After Aromatase Inhibitor and a CDK4/6 Inhibitor
NCT05038735CI-TRIAL-00123341EPIK-B5active not recruitingPhase 3ClinicalTrials.gov clinicaltrialsProvenance
- Source
- ClinicalTrials.gov
- Retrieved
- Sep 19, 2026
- Layer
- normalized (units and labels harmonized; values unchanged)
- Run
- ING-CLINICALTRIALS-20260919-000001
Summary
Brief summary (as posted)
The purpose of this study is to complement Study CBYL719C2301 (SOLAR-1) and obtain more comprehensive data on the efficacy and safety of alpelisib (BYL719) in combination with fulvestrant compared with placebo plus fulvestrant in men or postmenopausal women with HR-positive, HER2-negative advanced breast cancer with a PIK3CA mutation who progressed or relapsed on or after treatment with an AI plus a CDK4/6 inhibitor.
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 (3)
| Intervention | Type | Mapped drug | Match |
|---|---|---|---|
| Alpelisib | Drug | Alpelisib | ALIAS |
| Alpelisib-matching placebo | Drug | — | UNRESOLVED |
| Fulvestrant | Drug | Fulvestrant | ALIAS |
Design
Arms and outcomes
Arms (2)
- type
- EXPERIMENTAL
- label
- Alpelisib plus fulvestrant
- description
- Alpelisib 300 mg orally once daily on a continuous dosing schedule, in a 28-day cycle + fulvestrant 500 mg as intramuscular injection on Cycle 1 Day 1 and 15, and on Day 1 on every Cycle thereafter, in a 28 days cycle.
- interventionNames
- Drug: Alpelisib
- Drug: Fulvestrant
- type
- PLACEBO_COMPARATOR
- label
- Alpelisib-matching placebo plus fulvestrant
- description
- Alpelisib-matching placebo orally once daily on a continuous dosing schedule, in a 28-day cycle + fulvestrant 500 mg as intramuscular injection on Cycle 1 Day 1 and 15 and on Day 1 on every Cycle thereafter, in a 28 days cycle. After Protocol Amendment 5 is implemented, alpelisib matching-placebo will no longer be supplied or administered once participants have been unblinded.
- interventionNames
- Drug: Fulvestrant
- Drug: Alpelisib-matching placebo
Primary outcomes (1)
Eligibility
Eligibility (as posted)
- Sex
- All
- Minimum age
- 18 Years
- Maximum age
- 100 Years
Show eligibility criteria text
Key Inclusion Criteria: * Participant is an adult ≥ 18 years old at the time of informed consent and has signed informed consent before any trial related activities and according to local guidelines. * Participant has a histologically and/or cytologically confirmed diagnosis of ER+ and/or PgR+ breast cancer by local laboratory. * Participant has HER2-negative breast cancer defined as a negative in situ hybridization test or an IHC status of 0, 1+ or 2+. If IHC is 2+, a negative in situ hybridization (Fluorescent in situ hybridization (FISH), Chromogenic in situ hybridization (CISH), or Silver-enhanced in situ hybridization (SISH)) test is required by local laboratory testing. * Participant has at least one measurable lesion as per RECIST v1.1 criteria as assessed by Investigator (a lesion at a previously irradiated site may only be counted as a target lesion if there is clear sign of progression since the irradiation). * Participant has recurrence or progression of disease during or after combined AI (i.e. letrozole, anastrozole, exemestane) and CDK4/6 inhibitor therapy. The combined AI and CDK4/6 inhibitor therapy does not need to be the latest treatment regimen (including adjuvant setting). * Participant has received ≤ 2 prior lines of systemic therapies overall in the metastatic setting, of which a maximum of 1 line of prior treatment with chemotherapy (except for neoadjuvant/ adjuvant chemotherapy) is permitted. * The presence of PIK3CA mutation(s) determined in tumor tissue prior to enrollment either by a Novartis designated laboratory or in tumor tissue or plasma ctDNA by a local laboratory using a Food and Drug Administration (FDA)-approved PIK3CA Companion Diagnostics (CDx) test for alpelisib or the CE-IVD QIAGEN Therascreen® PIK3CA RGQ PCR test. * If female, then the participant must be in postmenopausal status. Key Exclusion Criteria: * Participant with symptomatic visceral disease or any disease burden that makes the participant ineligible for endocrine therapy (ET) per the Investigator's best judgment. * Participant who relapsed with documented evidence of progression more than 12 months from completion of (neo)adjuvant endocrine/endocrine-based therapy with no treatment for metastatic disease. * Participant has received prior treatment with fulvestrant, any oral selective estrogen receptor degrader (SERD), any Phosphatidylinositol-3-Kinase (PI3K), mammalian Target of Rapamycin (mTOR) or Protein Kinase B (AKT) inhibitor. Other Inclusion and Exclusion Criteria do apply
References
Publications (0)
Data not yet available
No reference posted for this study.