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Itepekimab

Phase 3

Chronic Obstructive Pulmonary Disease | Biologics | Respiratory |Sanofi|Trials Updated: Oct 21, 2026

Itepekimab development status

Highest phase Phase 3
Registered trials 7 across 2 sponsors since Nov 2016

Itepekimab target and mechanism

Molecular targetIL33
Target classInhibitor
ModalityBiologics

Also known as Itepekimab (SAR440340), SAR440340, REGN3500

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLEDDMC
Total Trials8
Total Enrollment2,194

FDA Designations

No designations recorded

Itepekimab clinical trials

Itepekimab · 8 trials · 5 indications

Phase 3 4Phase 2 4
NCT07424144An Extension Study to Investigate the Long-term Safety and Tolerability of Itepekimab in Adult Participants With Inadequately Controlled Chronic Rhinosinusitis With Nasal PolypsChronic Rhinosinusitis With Nasal Polyps
ACTIVE NOT_RECRUITING59 Analytics
NCT06834347A Phase 3 Study to Assess the Efficacy, Safety, and Tolerability of Itepekimab (Anti-IL-33 mAb) in Participants With Inadequately-controlled Chronic Rhinosinusitis With Nasal PolypsChronic Rhinosinusitis With Nasal Polyps
ACTIVE NOT_RECRUITING231 Analytics
NCT06834360A Phase 3 Study to Assess the Efficacy, Safety, and Tolerability of Itepekimab (Anti-IL-33 mAb) in Participants With Inadequately-controlled Chronic Rhinosinusitis With Nasal PolypsChronic Rhinosinusitis With Nasal Polyps
ACTIVE NOT_RECRUITING216 Analytics
NCT06208306A Study to Investigate Long-term Safety and Tolerability of Itepekimab in Participants With COPDChronic Obstructive Pulmonary Disease
COMPLETED669 Analytics
PHASE3ACTIVE NOT_RECRUITING
An Extension Study to Investigate the Long-term Safety and Tolerability of Itepekimab in Adult Participants With Inadequately Controlled Chronic Rhinosinusitis With Nasal Polyps
Chronic Rhinosinusitis With Nasal PolypsUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
A Phase 3 Study to Assess the Efficacy, Safety, and Tolerability of Itepekimab (Anti-IL-33 mAb) in Participants With Inadequately-controlled Chronic Rhinosinusitis With Nasal Polyps
Chronic Rhinosinusitis With Nasal PolypsUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
A Phase 3 Study to Assess the Efficacy, Safety, and Tolerability of Itepekimab (Anti-IL-33 mAb) in Participants With Inadequately-controlled Chronic Rhinosinusitis With Nasal Polyps
Chronic Rhinosinusitis With Nasal PolypsUnlock trial analytics
PHASE3COMPLETED
A Study to Investigate Long-term Safety and Tolerability of Itepekimab in Participants With COPD
Chronic Obstructive Pulmonary DiseaseUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence of treatment-emergent adverse events (AEs), adverse events of special interest (AESIs), serious adverse events (SAEs), AEs leading to death, and AEs leading to permanent treatment discontinuation
Baseline to EOS (Week 72)

All AEs (serious or nonserious) will be collected from the signing of the ICF until end of study (EOS) visit

Change from baseline in the endoscopic NPS
Baseline to Week 24

The Nasal Polyp Score (NPS) is the sum of the right and left nostril scores, as evaluated by means of nasal endoscopy. Nasal polyp is graded based on polyp size from 0 to 4 with higher scores indicating larger polyps. The sum of right and left nostril scores ranges from 0 (no polyps) to 8 (large polyps).

Change from baseline in the NCS
Baseline to Week 24

The Nasal Congestion Score (NCS) is scored using a 0-3 categorical scale where 0 = no symptoms, 1 = mild symptoms, 2 = moderate symptoms and 3 = severe symptoms. Outcome value is defined as the preceding 28-day average of morning scores recorded in eDiary.

Incidence of treatment-emergent AEs, AESIs, SAEs, and AEs leading to permanent treatment discontinuation
Baseline up to Week 72

All AEs (serious or nonserious) will be collected from the signing of the informed consent form (ICF) until the end of study visit

Change from baseline in sinus (maxillary, ethmoid) percent opacification volume assessed by CT scan
Baseline to End of Treatment (EOT) (Week 24)

Change from baseline in sinus inflammation as assessed by Computerized Tomography (CT) scan of the sinuses in the itepekimab-- compared to placebo-- treated study participants on the background of intranasal corticosteroid (INCS).

Annualized Rate of Adjudicated Moderate or Severe Pulmonary Exacerbations (PEs) Over the Treatment Period
Baseline (Day 1) up to Week 24 to 52

PEs were recorded by Investigator. Moderate PEs were defined as acute worsening of respiratory symptoms (\>=3 symptoms for \>=48 hours) requiring antibiotic treatment. Severe PEs were moderate PEs resulting in intravenous antibiotic treatment, hospitalization, observation \>24 hours in emergency department/urgent care, or death. Events separated by \<14 days were considered as single events. All PE events were adjudicated by an independent committee. For both moderate and severe events to be counted as 2 separate events, they were separated by at least 14 days between any course of antibiotics and/or systemic corticosteroids or 14 days between discharge and new admission in case of hospitalization (severe events only). Annualized rate: number of events divided by total observation duration and was estimated based on negative binomial regression.

Annualized Rate of Moderate to Severe Acute Exacerbation Events in Chronic Obstructive Pulmonary Disease (AECOPD) Participants
From Baseline up to Week 52

Moderate exacerbations events were recorded by the investigator and defined as AECOPD that require either systemic corticosteroids (such as intramuscular, intravenous or oral) and/or antibiotics. Severe exacerbations events were defined as AECOPD requiring hospitalization, emergency medical care visit or resulting in death. Annualized event rate was the total number of exacerbations that occurred during the treatment period divided by the total number of participant-years treated.

Percentage of Participants With Loss of Asthma Control
From Baseline up to Week 12

An LOAC event during the 12-week treatment period was a deterioration of asthma defined as any of the following: a) 30 percent (%) or greater reduction from baseline in morning peak expiratory flow (PEF) on 2 consecutive days; b) greater than or equal to (\>=) 6 additional reliever puffs of salbutamol/albuterol or levosalbutamol/levalbuterol in a 24-hour period (compared to baseline) on 2 consecutive days; c) increase in inhaled corticosteroid (ICS) \>=4 times the last prescribed ICS dose (or \>=50% of the prescribed ICS dose at Baseline if background therapy withdrawal completed); d) required use of systemic (oral and/or parenteral) steroid treatment; e) required hospitalization or emergency room visit.

Secondary Endpoints

Change from baseline of the parent studies (EFC18418, EFC18419) in endoscopic NPS
Baseline to Week 52
Change from baseline of the parent studies (EFC18418, EFC18419) in NCS
Baseline to EOS (Week 72)
Functional itepekimab concentration in serum
Baseline to EOS (Week 72)
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Itepekimab high doseEXPERIMENTALSubcutaneous (SC) administration of Itepekimab high dose for 52 weeks
Itepekimab low doseEXPERIMENTALSC administration of Itepekimab low dose for 52 weeks
PlaceboPLACEBO_COMPARATORSC administration of matching placebo for 52 weeks
Itepekimab Q2WEXPERIMENTALSubcutaneous (SC) administration of Itepekimab every 2 weeks (Q2W) for up to 52 weeks
Itepekimab Q4WEXPERIMENTALSC administration of Itepekimab every 4 weeks (Q4W) for up to 52 weeks, with alternating SC administration of matching placebo at the 2-week interval between active IMP
SAR440340EXPERIMENTALParticipants received SAR440340 300 milligrams (mg) administered as 2 SC injections Q2W. Participants were treated for a minimum of 24 weeks and up to a maximum of 52 weeks (last dose administered at Week 50, EOT visit occurred 2 weeks after last administration of IMP i.e., at Week 52).
DupilumabACTIVE_COMPARATORParticipants received 1 injection of dupilumab 300 mg along with 2 injections of SAR440340 placebo, SC Q2W for 12 weeks.
SAR440340 + DupilumabEXPERIMENTALParticipants received 2 injections of SAR440340 300 mg along with 1 injection of dupilumab 300 mg, SC Q2W for 12 weeks.

Interventions

NameTypeDescription
Itepekimab (SAR440340)DRUGPharmaceutical form: Solution for injection in prefilled syringe. Route of administration: Subcutaneous
PlaceboDRUGPharmaceutical form: Solution for injection in prefilled syringe. Route of administration: Subcutaneous
Mometasone furoate nasal spray (MFNS)DRUGPharmaceutical form: Solution for administration via spray pump. Route of administration: Intranasal spray
SAR440340DRUGPharmaceutical form: Solution for injection; Route of administration: SC
Any Inhaled Corticosteroids as prescribed by treating physician as standard of careDRUGPharmaceutical form: Aerosol or Dry Powder inhaler Route of administration: Inhaled
Any Long Acting Beta Agonist as prescribed by treating physician as standard of careDRUGPharmaceutical form: Aerosol or Dry Powder inhaler; Route of administration: Inhaled
Any Long Acting Muscarinic Agonist as prescribed by treating physician as standard of careDRUGPharmaceutical form: Aerosol or Dry Powder inhaler; Route of administration: Inhaled
Any short-acting β agonist as prescribed by treating physician as standard of careDRUGPharmaceutical form: Aerosol or Dry Powder inhaler; Route of administration: inhaled
DupilumabDRUGPharmaceutical form: Solution for Injection, Route of administration: SC
Fluticasone or Fluticasone/salmeterol combinationDRUGPharmaceutical form: Aerosol, dry powder, Route of administration: Inhaled
Placebo for SAR440340DRUGPharmaceutical form: Solution for Injection, Route of administration: SC
Placebo for dupilumabDRUGPharmaceutical form: Solution for Injection, Route of administration: SC
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites46

Inclusion Criteria: * Participants with CRSwNP who completed the 52-weeks intervention period in a previous itepekimab CRSwNP Phase 3 clinical study (ie, EFC18418 or EFC18419) and for which an EOT visit occurred no later than 5 days before the enrollment visit of this study. * A female participant ...

Countries:United StatesArgentinaAustraliaAustriaCanadaChileChinaCzechiaHungaryPolandPortugalSouth KoreaUnited KingdomBrazilFinlandGermanyIsraelItalyJapanMexicoNetherlandsSpainSwedenTurkey (Türkiye)BelgiumDenmarkFranceRomaniaBulgariaEstoniaGeorgiaGreeceIndiaLithuaniaNorwaySlovakiaSouth AfricaTaiwanRussiaUkraine
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Recent Changes (Last 90 Days)

MEDIUMNov 7, 2026NCT06280391TRIAL_REMOVED: changed
MEDIUMNov 7, 2026NCT06280391TRIAL_REMOVED: changed
MEDIUMNov 7, 2026NCT06280391TRIAL_REMOVED: changed
LOWOct 21, 2026NCT06834347primaryCompletionDate: changed
LOWOct 21, 2026NCT06834360primaryCompletionDate: changed
LOWOct 21, 2026NCT06834347primaryCompletionDate: changed
LOWOct 21, 2026NCT06834360primaryCompletionDate: changed
LOWOct 21, 2026NCT06834347primaryCompletionDate: changed
LOWOct 21, 2026NCT06834360primaryCompletionDate: changed
MEDIUMOct 19, 2026NCT06208306TRIAL_REMOVED: changed
MEDIUMOct 19, 2026NCT06208306TRIAL_REMOVED: changed
MEDIUMOct 19, 2026NCT06208306TRIAL_REMOVED: changed
MEDIUMOct 19, 2026NCT06208306TRIAL_REMOVED: changed
LOWOct 13, 2026NCT07424144lastUpdatePostDate: changed
LOWOct 13, 2026NCT07424144lastUpdatePostDate: changed
MEDIUMSep 25, 2026NCT06691113TRIAL_REMOVED: changed
MEDIUMSep 25, 2026NCT06691113TRIAL_REMOVED: changed
MEDIUMSep 25, 2026NCT06691113TRIAL_REMOVED: changed

Frequently asked questions about Itepekimab

What is itepekimab?

Itepekimab is an investigational monoclonal antibody developed by Sanofi for respiratory and inflammatory conditions. It is being studied in chronic rhinosinusitis with and without nasal polyps, chronic obstructive pulmonary disease, and bronchiectasis. It is not yet approved and remains in clinical development.

What does itepekimab target?

Itepekimab targets IL33, an alarmin cytokine involved in type 2 inflammation. It is an IL33 inhibitor, meaning it is designed to block IL33 signaling. This mechanism is being explored across inflammatory airway diseases including chronic rhinosinusitis with nasal polyps and COPD.

Who makes itepekimab?

Itepekimab is developed by Sanofi, which trades under the ticker SNY. Sanofi is running the clinical development program, including Phase 3 studies in chronic rhinosinusitis with nasal polyps and a completed Phase 2 proof-of-concept study in chronic rhinosinusitis without nasal polyps.

What phase is itepekimab in?

Itepekimab is in Phase 3 development for chronic rhinosinusitis with nasal polyps, with three active Phase 3 studies listed. A Phase 2 proof-of-concept study in chronic rhinosinusitis without nasal polyps has been completed. The drug is investigational and has not been approved by the FDA.

What clinical trials is itepekimab in?

Itepekimab is being studied in NCT06834360 and NCT06834347, two Phase 3 trials in inadequately controlled chronic rhinosinusitis with nasal polyps, and NCT07424144, a Phase 3 long-term extension study in the same condition. NCT06691113, a completed Phase 2 proof-of-concept study, evaluated chronic rhinosinusitis without nasal polyps.

Is itepekimab the same as SAR440340?

Yes, itepekimab is also known as SAR440340. SAR440340 is Sanofi's internal compound designation for the same anti-IL-33 monoclonal antibody. Both names refer to the identical investigational drug being studied in chronic rhinosinusitis with nasal polyps, chronic rhinosinusitis without nasal polyps, COPD, and bronchiectasis.