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Itepekimab

Phase 3

Chronic Obstructive Pulmonary Disease | Monoclonal antibody | Respiratory |Sanofi|Last Updated: Sep 18, 2026

Target and mechanism

Molecular targetIL33
Target classInhibitor
ModalityMonoclonal antibody

Also known as Itepekimab (SAR440340)

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLEDDMC
Total Trials1
Total Enrollment669

FDA Designations

No designations recorded

Clinical trial landscape

Itepekimab · 6 trials · 4 indications

Phase 3 4Phase 2 2
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 moderate or severe Pulmonary exacerbations (PEs) over the treatment period
Baseline up to End of Treatment (EOT) (24-52 weeks)

Annualized rate of moderate or severe PEs over the placebo-controlled treatment period

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

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
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites23

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 StatesAustraliaCanadaChileChinaCzechiaHungarySouth KoreaUnited KingdomArgentinaAustriaBrazilFinlandGermanyIsraelItalyJapanMexicoNetherlandsPolandPortugalSpainSwedenTurkey (Türkiye)BelgiumDenmarkFranceRomaniaBulgariaEstoniaGeorgiaGreeceIndiaLithuaniaNorwaySlovakiaSouth AfricaTaiwan
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Recent Changes (Last 90 Days)

HIGHSep 19, 2026NCT06208306Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHSep 19, 2026NCT06208306Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHSep 19, 2026NCT06208306Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHAug 25, 2026NCT06691113Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHAug 25, 2026NCT06691113Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHAug 12, 2026NCT07424144Status: ENROLLING_BY_INVITATION → ACTIVE_NOT_RECRUITING
HIGHAug 12, 2026NCT07424144Status: ENROLLING_BY_INVITATION → ACTIVE_NOT_RECRUITING

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 is itepekimab used for?

Itepekimab is being evaluated for chronic rhinosinusitis with nasal polyps, chronic rhinosinusitis without nasal polyps, chronic obstructive pulmonary disease, and bronchiectasis. The most advanced program is in inadequately controlled chronic rhinosinusitis with nasal polyps, where Phase 3 studies are ongoing.

What does itepekimab target?

Itepekimab targets IL33, an alarmin cytokine involved in type 2 inflammation. It is an inhibitor monoclonal antibody that binds IL33 and blocks its signaling. This mechanism is being explored across inflammatory airway diseases including chronic rhinosinusitis and COPD.

Who makes itepekimab?

Itepekimab is developed by Sanofi, which trades under the ticker SNY. Sanofi is running the clinical program, including the Phase 3 studies in chronic rhinosinusitis with nasal polyps and the 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. A Phase 2 proof-of-concept study in chronic rhinosinusitis without nasal polyps has been completed. It 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. The completed Phase 2 study in chronic rhinosinusitis without nasal polyps is NCT06691113.

Is itepekimab the same as SAR440340?

Yes, itepekimab is also known as SAR440340. Both names refer to the same anti-IL-33 monoclonal antibody developed by Sanofi. Searches for either name lead to the same clinical development program in chronic rhinosinusitis, COPD, and bronchiectasis.