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SAR447537

Phase 2

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

Target and mechanism

Molecular targetAAT
Target classProtein
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLEDDMC
Total Trials2
Total Enrollment284

FDA Designations

No designations recorded

Clinical trial landscape

SAR447537 · 2 trials · 2 indications

Phase 2 2
NCT05897424Long-term, Open-label Study of SAR447537 (INBRX-101) in Adults With Alpha-1 Antitrypsin Deficiency EmphysemaAlpha 1-Antitrypsin Deficiency
ACTIVE NOT_RECRUITING185 Analytics
NCT05856331Study of SAR447537 (INBRX-101) Compared to Plasma-derived A1PI Therapy in Adults With AATD EmphysemaAlpha 1-Antitrypsin Deficiency
COMPLETED99 Analytics
PHASE2ACTIVE NOT_RECRUITING
Long-term, Open-label Study of SAR447537 (INBRX-101) in Adults With Alpha-1 Antitrypsin Deficiency Emphysema
Alpha 1-Antitrypsin DeficiencyUnlock trial analytics
PHASE2COMPLETED
Study of SAR447537 (INBRX-101) Compared to Plasma-derived A1PI Therapy in Adults With AATD Emphysema
Alpha 1-Antitrypsin DeficiencyUnlock trial analytics

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 to 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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Frequently asked questions about SAR447537

What is SAR447537 used for?

SAR447537 is an investigational small molecule being developed for Alpha 1-Antitrypsin Deficiency, specifically for the treatment of emphysema associated with this condition. It is currently in Phase 2 clinical development and is not yet approved by regulatory authorities.

What does SAR447537 target?

SAR447537 targets AAT, which is the alpha-1 antitrypsin protein. By targeting this protein, the drug aims to address the underlying deficiency in patients with Alpha 1-Antitrypsin Deficiency and associated emphysema.

Who is developing SAR447537?

SAR447537 is being developed by Sanofi, a biopharmaceutical company listed on the stock exchange under the ticker SNY. The drug is currently in Phase 2 clinical trials for the treatment of Alpha 1-Antitrypsin Deficiency with emphysema.

What phase is SAR447537 in?

SAR447537 is in Phase 2 clinical development. It is an investigational drug and has not yet received regulatory approval. The drug is being studied in two Phase 2 trials, one of which has been completed and another that is active but not recruiting participants.

What clinical trials is SAR447537 in?

SAR447537 is being studied in two Phase 2 clinical trials. The first, NCT05856331, compared SAR447537 to plasma-derived A1PI therapy in adults with AATD emphysema and has been completed. The second, NCT05897424, is a long-term, open-label study in adults with the same condition and is active but not recruiting.

Is SAR447537 the same as INBRX-101?

Yes, SAR447537 is also known as INBRX-101. Clinical trials for this drug use both names, with the completed study NCT05856331 and the ongoing study NCT05897424 referring to the drug as SAR447537 (INBRX-101).