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SAR447537

Phase 2

Alpha 1-Antitrypsin Deficiency | Small molecule | Respiratory |Sanofi|Last Updated: Apr 13, 2026

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
RandomizedDouble-BlindACTIVE_CONTROLLEDDMC
Total Trials2
Total Enrollment284
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05897424Long-term, Open-label Study of SAR447537 (INBRX-101) in Adults With Alpha-1 Antitrypsin Deficiency EmphysemaPHASE2 ACTIVE NOT_RECRUITING 185Jun 20, 2024Sep 30, 2028Apr 13, 202640 United States, Australia +7
NCT05856331Study of SAR447537 (INBRX-101) Compared to Plasma-derived A1PI Therapy in Adults With AATD EmphysemaPHASE2 COMPLETED 99Oct 12, 2023Aug 6, 2025Aug 11, 202565 United States, Australia +6
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Study Endpoints
Primary Endpoints
Long-term safety and tolerability
3 years

Incidence of all treatment emergent adverse events (TEAEs), TEAEs ≥ Grade 3, serious adverse events (SAEs), TEAEs leading to discontinuation from SAR447537, and adverse events of special interest (AESIs) (including infusion-related reactions).

Serum functional AAT (fAAT) levels at steady-state
32 Weeks

To assess the mean change in average fAAT concentration as measured by anti-neutrophil elastase capacity \[ANEC\] from baseline to average serum trough fAAT concentration at steady-state (Ctrough,ss) in participants treated with SAR447537 compared to A1PI

Secondary Endpoints
Change in lung density by quantitative computerized tomography (CT)
3 years
Trough SAR447537 concentration changes
3 years
Trough serum functional AAT (fAAT) concentration changes
3 years
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Study Design & Arms
AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
SAR447537 (INBRX-101)EXPERIMENTALA1PI, Recombinant, Bivalent Fc Fusion Protein, in a solution for intravenous injection
SAR447537 (INBRX-101) Q3WEXPERIMENTALIV every 3-weeks (Q3W) and placebo (normal saline)
SAR447537 (INBRX-101) Q4WEXPERIMENTALIV every 4-weeks (Q4W) and placebo (normal saline)
Zemaira (A1PI)ACTIVE_COMPARATOR60 mg/kg IV once weekly (QW) and placebo (normal saline)
Interventions
NameTypeDescription
SAR447537DRUGA1PI, Recombinant, Bivalent Fc Fusion Protein
ZemairaDRUGAlpha1-Proteinase Inhibitor (Human)
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Eligibility Criteria
Age Range18 Years — 80 Years
SexALL
Healthy VolunteersNo
Study Sites40

Inclusion Criteria: 1. Males or females 18-80 years of age, inclusive, at the time of screening 2. Diagnosis of AATD 3. Evidence of emphysema secondary to AATD 4. FEV1 of ≥ 30% predicted at screening and post-bronchodilator FEV1/FVC\<0.7 5. Current non-smoking status Exclusion Criteria: For newly...

Countries:United StatesAustraliaDenmarkIrelandNew ZealandPolandSpainSwedenUnited Kingdom
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Recent Changes (Last 90 Days)
MEDIUMMay 26, 2026NCT05897424Status: RECRUITING → ACTIVE_NOT_RECRUITING
LOWMay 24, 2026NCT05897424studyFirstPostDate: changed