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amcenestrant

Phase 1

Breast Cancer | Small molecule | Oncology |Sanofi|Last Updated: Sep 24, 2025

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials1
Total Enrollment6

FDA Designations

No designations recorded

Clinical trial landscape

amcenestrant · 1 trial · 2 indications

Phase 1 1
NCT04940026Study to Determine Absorption, Metabolism, and Excretion of [14C]-SAR439859, and to Assess Absolute Oral Bioavailability of Amcenestrant (SAR439859), in Healthy Post-menopausal WomenBreast Cancer
COMPLETED6 Analytics
PHASE1COMPLETED
Study to Determine Absorption, Metabolism, and Excretion of [14C]-SAR439859, and to Assess Absolute Oral Bioavailability of Amcenestrant (SAR439859), in Healthy Post-menopausal Women
Breast CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of radioactive dose, SAR439859 and M7 excreted in urine and feces after IV administration
Day 1 to Day 6
Percentage of radioactive dose excreted in urine and feces after oral administration
Day 7 up to max Day 44
Assessment of Pharmacokinetic (PK) parameter: AUC for radioactivity and SAR439859 after IV administration
Day 1 to Day 3

Area under the plasma concentration versus time curve extrapolated to infinity

Assessment of PK parameter: t1/2z for radioactivity and SAR439859 after IV administration
Day 1 to Day 3

Terminal half-life associated with the terminal slope (λz)

Assessment of PK parameter: CL for SAR439859 after IV administration
Day 1 to Day 3

Total body clearance

Assessment of PK parameter: AUC ratios after IV administration
Day 1 to Day 3

SAR439859 to radioactivity ratio for plasma AUC

Assessment of PK parameter: Cmax for radioactivity and SAR439859 after oral administration
Day 1 to Day 5, Day 7 to Day 11

Maximum plasm concentration observed

Assessment of PK parameter: tmax for radioactivity and SAR439859 after oral administration
Day 1 to Day 5, Day 7 to Day 11

Time to reach Cmax

Assessment of PK parameter: AUC for radioactivity and SAR439859 after oral administration
Day 1 to Day 5, Day 7 to Day 11
Assessment of PK parameter: t1/2z for radioactivity and SAR439859 after oral administration
Day 1 to Day 5, Day 7 to Day 11
Assessment of PK parameter: AUC ratios after oral administration
Day 7 to Day 11

SAR439859 to radioactivity ratio for plasma AUC

Assessment of PK parameter: Cmax for M7 after IV and oral administration
Day 1 to Day 5, Day 7 to Day 11
Assessment of PK parameter: AUC for M7 after IV and oral administration
Day 1 to Day 5, Day 7 to Day 11
Assessment of PK parameter: t1/2z for M7 after IV and oral administration
Day 1 to Day 5, Day 7 to Day 11
Assessment of PK parameter: Rmet Cmax after IV and oral administration
Day 1 to Day 5, Day 7 to Day 11

M7 to SAR439859 ratio for plasma Cmax

Assessment of PK parameter: Rmet AUC after IV and oral administration
Day 1 to Day 5, Day 7 to Day 11

M7 to SAR439859 ratio for plasma AUC

Absolute oral bioavailability of SAR439859
Day 1 to Day 5, Day 7 to Day 11

Absolute oral bioavailability, expressed as a percentage, estimated from AUCs obtained after oral and IV administration

Relative bioavailability of SAR439859 after oral administration
Day 1 to Day 5, Day 7 to Day 11

Secondary Endpoints

Number of participants with adverse events
Day 1 to Day 44
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeOTHER

Treatment Arms

ArmTypeDescription
SAR439859EXPERIMENTALSingle oral dose of SAR439859 at Day 1 in fasted condition followed by intravenous administration of \[14C\]-SAR439859 microtracer 3 hours later, and single oral dose of \[14C\]-SAR439859 at Day 7 in fasted condition

Interventions

NameTypeDescription
amcenestrantDRUGTablet Oral
[14C]-SAR439859 microtracerDRUGSolution for infusion Intravenous
[14C]-SAR439859DRUGPowder for oral solution Oral
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Eligibility Criteria

Age Range40 Years to 75 Years
SexFEMALE
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: Female participants (age between 40 and 75 years old) who are postmenopausal or had post-bilateral surgical oophorectomy not linked to a history of cancer. Participants who are overtly healthy. Body weight within 40.0 and 95.0 kg and body mass index (BMI) within the range 18.0 ...

Countries:United Kingdom
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Competitive Landscape -Breast Cancer 402 trials

Top 20 of 92 competitors

CompanyTickerTrialsLead PhaseDrugs
AstraZeneca PLCAZN47PHASE3Fulvestrant, Capivasertib
Merck & Co., Inc.MRK12PHASE3Pembrolizumab, Paclitaxel, Doxorubicin, Epirubicin, Cyclophosphamide
Eli Lilly and CompanyLLY27PHASE3Abemaciclib, Standard Adjuvant Endocrine Therapy
BioNTech SE Sponsored ADRBNTX7PHASE3DB-1303/BNT323, T-DM1
Gilead Sciences, Inc.GILD13PHASE3Sacituzumab Govitecan-hziy, Eribulin, Capecitabine Product, Gemcitabine, Vinorelbine
Novartis AG Sponsored ADRNVS30PHASE3Ribociclib
Pfizer Inc.PFE34PHASE3ARV-471, Fulvestrant
BeOne Medicines Ltd. Sponsored ADRONC5PHASE3BGB-43395, Letrozole, Abemaciclib, Palbociclib, Ribociclib
Olema Pharmaceuticals, Inc.OLMA5PHASE3Palazestrant, Fulvestrant, Anastrozole, Letrozole, Exemestane
Jazz Pharmaceuticals Public Limited CompanyJAZZ3PHASE3Zanidatamab, Trastuzumab, Eribulin, Vinorelbine, Gemcitabine
Celcuity Inc.CELC3PHASE3Gedatolisib, Palbociclib, Fulvestrant, Alpelisib
Relay Therapeutics, Inc.RLAY2PHASE3Zovegalisib, Capivasertib, Fulvestrant
GSK plc Sponsored ADRGSK2PHASE3Niraparib
Greenwich LifeSciences, Inc.GLSI1PHASE3GLSI-100
Bristol-Myers Squibb CompanyBMY5PHASE2Iza-bren, Nab-paclitaxel, Paclitaxel, Capecitabine, Carboplatin
BriaCell Therapeutics CorpBCTX2PHASE3SV-BR-1-GM, Cyclophosphamide, Interferon infiltration of the inoculation site, Retifanlimab, Treatment of Physician's Choice
Incyte CorporationINCY4PHASE2Ruxolitinib, Capecitabine, Regorafenib
Natera, Inc.NTRA3PHASE2Discontinuation of the anti-HER2 maintenance therapy
Puma Biotechnology, Inc.PBYI3PHASE2Neratinib, Loperamide, Colesevelam
Atossa Therapeutics, Inc.ATOS1PHASE2endoxifen, goserelin
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Frequently asked questions about amcenestrant

What is amcenestrant used for?

Amcenestrant is an investigational small molecule being studied for the treatment of breast cancer. It is currently in Phase 1 clinical development. The drug is being evaluated in healthy post-menopausal women as part of a study to understand its absorption, metabolism, and excretion.

Who makes amcenestrant?

Amcenestrant is being developed by Sanofi, a global biopharmaceutical company. Sanofi's stock is traded under the ticker symbol SNY. The drug is currently in Phase 1 clinical development for breast cancer.

What phase is amcenestrant in?

Amcenestrant is in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities. One Phase 1 study has been completed, which involved 6 participants.

What clinical trials is amcenestrant in?

Amcenestrant has one completed clinical trial, registered as NCT04940026. This Phase 1 study was designed to determine the absorption, metabolism, and excretion of the drug and to assess its absolute oral bioavailability in healthy post-menopausal women. The study was conducted in the United Kingdom.

Is amcenestrant the same as SAR439859?

Yes, amcenestrant is also known as SAR439859. The clinical trial NCT04940026 refers to the drug as SAR439859. This alternative name is used in the study title and is important for identifying the drug in clinical trial registries.