Phase 2 Study of Amcenestrant (SAR439859) Versus Physician's Choice in Locally Advanced or Metastatic ER-positive Breast Cancer

Stopped early · Phase 2

Conditions studied: Breast Cancer Metastatic

In brief

Primary Objective: To determine whether amcenestrant per overall survival (os) improves progression free survival (PFS) when compared with an endocrine monotherapy of the choice of the physician, in participants with metastatic or locally advanced breast cancer Secondary Objectives: * To compare the overall survival in the 2 treatment arms * To assess the objective response rate in the 2 treatment arms * To evaluate the disease control rate in the 2 treatment arms * To evaluate the clinical benefit rate in the 2 treatment arms * To evaluate the duration of response in the 2 treatment arms * To evaluate the PFS according to the estrogen receptor 1 gene (ESR1) mutation status in the 2 treatment arms * To evaluate the pharmacokinetics of amcenestrant as single agent * To evaluate health-related quality of life in the 2 treatment arms * To compare the overall safety profile in the 2 treatment arms

Key facts

Study ID: NCT04059484
Run by: Sanofi
People needed: 367
Starts: 2019-10-22
Expected to finish: 2025-01-02
Last updated by the study team: 2026-02-24

Who can join

Age: 18 and older. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

18 years or older.
Histological or cytological diagnosis of adenocarcinoma of the breast.
Locally advanced not amenable to radiation therapy or surgery in a curative intent, and/or metastatic disease.
Estrogen receptor(ER) positive status.
Human epidermal growth factor receptor 2 negative status.
Participants must have received no more than 1 prior chemotherapeutic or 1 targeted therapy regimen for advanced/metastatic disease.
In the main study, a prior treatment with a Cyclin-dependent kinase 4 and 6(CDK 4/6) inhibitor is mandatory if this treatment is approved and can be reimbursed for this participant. The percentage of participants without previous CDK 4/6 inhibitor will be capped to 20%. In the Chinese extension cohort, previous treatment with a CDK 4/6 inhibitor will not be mandatory, and there will be no limitation to the number of participants naïve to CDK4/6 inhibitor.
Participants must present a secondary endocrine resistance to endocrine therapy defined as: progression while on endocrine therapy after at least 6 months of treatment for advanced breast cancer, or relapse while on adjuvant endocrine therapy but after the first 2 years, or with a relapse within 12 months after completing adjuvant endocrine therapy.
Male or Female.

You may not qualify if…

Eastern Cooperative Oncology Group performance status =>2.
Medical history or ongoing gastrointestinal disorders potentially affecting the absorption of amcenestrant. Participants unable to swallow normally and to take capsules.
Participant with any other cancer. Adequately treated basal cell or squamous cell skin cancer or in situ cervical cancer or any other cancer from which the participant has been disease free for greater than 3 years are allowed.
Severe uncontrolled systemic disease at screening .
Participants with known brain metastases that are untreated, symptomatic or require therapy to control symptoms.
Prior treatment with mammalian target of rapamycin inhibitors or any other selective estrogen receptor degrader(SERD) compound, except fulvestrant if stopped for at least 3 months before randomization.
Treatment with drugs that have the potential to inhibit Uridine'5 Diphospho-Glucuronosyl Transferase(UGT) less than 2 weeks before randomization.
Treatment with strong Cytochrome P450 (CYP)3A inducers within 2 weeks before randomization.
Ongoing treatment with drugs that are sensitive substrate of organic anion transporting polypeptide 1B1/B3(OATP1B1/B3) (asunaprevir, atorvastatin, bosentan, danoprevir, fexofenadine, glyburide, nateglinide, pitavastatin, pravastatin, replaglinide, rosuvastatin, and simvastatin acid).
Treatment with anticancer agents (including investigational drugs) less than 3 weeks before randomization.
Inadequate hematological, coagulation, renal and liver functions.
The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.

Where it is running

Comprehensive Blood and Cancer Center Site Number : 8400018 — Bakersfield, California, United States
UCLA Santa Monica - Parkside- Site Number : 8400024 — Santa Monica, California, United States
University of Kansas Clinical Research Center- Site Number : 8400027 — Fairway, Kansas, United States
Hematology Oncology Clinic Site Number : 8400020 — Baton Rouge, Louisiana, United States
Dana-Farber Cancer Institute- Site Number : 8400015 — Boston, Massachusetts, United States
Saint Luke's Hospital of Kansas City- Site Number : 8400032 — Kansas City, Missouri, United States
Dartmouth-Hitchcock Medical Center - Lebanon - 1 Medical Center Drive- Site Number : 8400013 — Lebanon, New Hampshire, United States
Hackensack Meridian Health - Hackensack University Medical Center- Site Number : 8400025 — Hackensack, New Jersey, United States
Gabrail Cancer Center- Site Number : 8400006 — Canton, Ohio, United States
The Center for Cancer & Blood Disorders - Fort Worth- Site Number : 8400022 — Fort Worth, Texas, United States
University of Vermont Medical Center- Site Number : 8400026 — Burlington, Vermont, United States
Northwest Medical Specialties Tacoma- Site Number : 8400038 — Tacoma, Washington, United States
University of Wisconsin Hospitals and Clinics- Site Number : 8400016 — Madison, Wisconsin, United States
Investigational Site Number : 0320005 — Rosario, Santa Fe Province, Argentina
Investigational Site Number : 0320007 — Buenos Aires, Argentina
Investigational Site Number : 0320008 — Buenos Aires, Argentina
Investigational Site Number : 0320006 — Buenos Aires, Argentina
Investigational Site Number : 0320001 — Buenos Aires, Argentina
Investigational Site Number : 0320004 — La Rioja, Argentina
Investigational Site Number : 0320002 — Salta, Argentina
Investigational Site Number : 0360003 — South Brisbane, Queensland, Australia
Investigational Site Number : 0360002 — Woolloongabba, Queensland, Australia
Investigational Site Number : 0360001 — Nedlands, Western Australia, Australia
Investigational Site Number : 0560002 — Charleroi, Belgium
Alabama Oncology - St. Vincent's Birmingham- Site Number : 8400008 — Birmingham, Alabama, United States

Full record on ClinicalTrials.gov

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