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amcenestrant

Phase 1

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

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
UNCONTROLLEDBiomarker
Total Trials1
Total Enrollment6
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT04940026Study to Determine Absorption, Metabolism, and Excretion of [14C]-SAR439859, and to Assess Absolute Oral Bioavailability of Amcenestrant (SAR439859), in Healthy Post-menopausal WomenPHASE1 COMPLETED 6Jun 15, 2021Aug 19, 2021Sep 24, 20251 United Kingdom
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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 — 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 408 trials
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