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NCT06181435CompletedPhase 3

A Study to Evaluate the Efficacy and Safety of Subcutaneous Amlitelimab Monotherapy Compared With Placebo in Participants Aged 12 Years and Older With Moderate-to-severe Atopic Dermatitis (COAST 2)

A Phase 3, Randomized, Double-blind, Placebo-controlled, Parallelgroup, 3-arm, Multinational, Multicenter Study to Evaluate the Efficacy and Safety of Amlitelimab Monotherapy by Subcutaneous Injection in Participants Aged 12 Years and Older With Moderate-to-severe Atopic Dermatitis

Source: ClinicalTrials.gov · Last updated 13 Aug 2026

Brief summary (registry, in English)

This is a parallel group, Phase 3, multinational, multicenter, randomized, double-blind, placebo-controlled, 3-arm monotherapy study for treatment of participants diagnosed with moderate to severe atopic dermatitis (AD), whose disease is not adequately controlled with topical prescription therapies or when those therapies are not advisable. The purpose of this study is to measure the efficacy and safety of treatment with amlitelimab solution for SC injection compared with placebo in participants with moderate to severe AD aged 12 years and older. Study details include: At the end of the treatment period, participants will have an option to enter a separate study: the blinded extension study EFC17600 (ESTUARY). For participants not entering the blinded extension Study EFC17600 (ESTUARY), the study duration will be up to 44 weeks including a 2 to 4-week screening, a 24-week randomized double-blind period, and a 16-week safety follow-up. For participants entering the blinded extension Study EFC17600 (ESTUARY), the study duration will be up to 28 weeks including a 2 to 4-week screening and a 24-week randomized double-blind period. The total treatment duration will be up to 24 weeks. The total number of visits will be up to 10 visits (or 9 visits for those entering the blinded extension study EFC17600 (ESTUARY).

Status (registry)
Completed
Phase (registry)
Phase 3
Study type
Interventional
Enrollment
589 (actual)
First submitted
13 Dec 2023
Start date
21 Dec 2023
Primary completion date
25 Nov 2025
Lead sponsor
Sanofi
NCT number
NCT06181435
EU CT number
2023-506557-38-00
EudraCT number
2023-506557-38

What you commit to

  • Study type: Interventional · Phase 3
  • Participants enrolled: 589
  • From 21 Dec 2023 to the primary completion date, 25 Nov 2025
  • 143 sites in 16 countries
  • Visits and tests: ask the trial team, the registry does not list them

Built from the registry fields of ClinicalTrials.gov. It describes the study, not your situation.

Who cannot take part

Copied verbatim from ClinicalTrials.gov and grouped by topic. Only the trial team decides who can take part.

Prior treatment

  • Any active or chronic infection including helminthic infection requiring systemic treatment within 4 weeks prior to baseline
  • Having received any of the specified therapy within the specified timeframe(s) prior to the baseline visit

Other illness

  • Known history of or suspected significant current immunosuppression
  • History of solid organ or stem cell transplant
  • Positive for human immunodeficiency virus (HIV), Hepatitis B or hepatitis C at screening visit
  • Having active tuberculosis (TB), latent TB, a history of incompletely treated TB, suspected extrapulmonary TB infection, or who are at high risk of contracting TB
  • History of hypersensitivity or allergy to any of the excipients or investigational medicinal product (IMP)
    • The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.

Lab values

  • In the Investigator's opinion, any clinically significant laboratory results or protocol specified laboratory abnormalities at screening

Age

  • Any malignancies or history of malignancies prior to baseline (with the exception of non-melanoma skin cancer excised and cured \>5 years prior to baseline)

Other

  • Participants are excluded from the study if any of the following criteria apply:
  • Skin co-morbidity that would adversely affect the ability to undertake AD assessments

Who the study is looking for

  • Participants must be 12 years of age (when signing informed consent form)
  • Diagnosis of AD for at least 1 year (defined by the American Academy of Dermatology Consensus Criteria)
  • Documented history (within 6 months before screening) of either inadequate response or inadvisability to topical treatments, and/or inadequate response to systemic therapies (within 12 months before screening)
  • v-IGA-AD of 3 or 4 at baseline visit
  • EASI score of 16 or higher at baseline
  • AD involvement of 10% or more of BSA at baseline
  • Weekly average of daily PP-NRS of ≥ 4 at baseline visit.
  • Able and willing to comply with requested study visits and procedures
  • Body weight ≥ 25 kg

Age in the registry: 12 years to - · Sex: All · Does not accept healthy volunteers

Full criteria on ClinicalTrials.gov

Sites (143)

Sites in registry order. Pick your city on the disease page to sort them by distance.

SiteCityCountrySite status
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BerazateguiArgentinaUnknown status
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Buenos AiresArgentinaUnknown status
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Buenos AiresArgentinaUnknown status
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Buenos AiresArgentinaUnknown status
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Buenos AiresArgentinaUnknown status
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PilarArgentinaUnknown status
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RosarioArgentinaUnknown status
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RosarioArgentinaUnknown status
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RosarioArgentinaUnknown status
Multiprofile Hospital For Active Treatment "Dr. Tota Venkova" AD
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GabrovoBulgariaCompleted
Medical Center Medconsult Pleven OOD
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PlevenBulgariaCompleted
Diagnostic-Consultative Center Alexandrovska EOOD
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SofiyaBulgariaCompleted
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QuillotaChileUnknown status
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SantiagoChileUnknown status
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SantiagoChileUnknown status
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SantiagoChileUnknown status
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ValdiviaChileUnknown status
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BeijingChinaUnknown status
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BeijingChinaUnknown status
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ChengduChinaUnknown status
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GuangzhouChinaUnknown status
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GuangzhouChinaUnknown status
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HangzhouChinaUnknown status
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HangzhouChinaUnknown status
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HangzhouChinaUnknown status
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JinanChinaUnknown status
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NingboChinaUnknown status
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ShanghaiChinaUnknown status
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ShanghaiChinaUnknown status
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ShenyangChinaUnknown status
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WenzhouChinaUnknown status
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WuxiChinaUnknown status
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ZhenjiangChinaUnknown status
Kozni ambulance Kutna Hora s.r.o.
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HlouskaCzechiaCompleted
CCR Ostrava s.r.o.
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Moravska Ostrava A PrivozCzechiaCompleted
AGE Centrum s.r.o.
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OlomoucCzechiaCompleted
Kozni ambulance Fialova, s.r.o.
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PragueCzechiaCompleted
Praglandia s.r.o.
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PragueCzechiaCompleted
Aalborg University Hospital
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AalborgDenmarkCompleted
Aarhus Universitetshospital
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Aarhus NDenmarkCompleted
Sanos A/S
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HerlevDenmarkCompleted
Hospital Universitario Virgen de las Nieves
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GranadaSpainCompleted
El Hospital Universitario De Gran Canaria Dr. Negrin
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Las Palmas De Gran CanariaSpainCompleted
Hospital Universitario La Paz
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MadridSpainCompleted
Hospital General Universitario Gregorio Marañón
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MadridSpainCompleted
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GlasgowUnited KingdomUnknown status
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LeicesterUnited KingdomUnknown status
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LondonUnited KingdomUnknown status
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LondonUnited KingdomUnknown status
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PortsmouthUnited KingdomUnknown status
Azienda Ospedaliero-Universitaria Policlinico G. Rodolico-San Marco Di Catania
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CataniaItalyCompleted
Azienda Ospedaliero Universitaria Pisana
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PisaItalyCompleted
Azienda Ospedaliera Policlinico Universitario Tor Vergata
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RomeItalyCompleted
Humanitas Research Hospital
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RozzanoItalyCompleted
Azienda Unita Locale Socio Sanitaria N 8 Berica
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VicenzaItalyCompleted
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ChitoseJapanUnknown status
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ChūōJapanUnknown status
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HabikinoJapanUnknown status
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IrumaJapanUnknown status
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KagoshimaJapanUnknown status
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KobeJapanUnknown status
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KyotoJapanUnknown status
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KyotoJapanUnknown status
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MibuJapanUnknown status
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MinatoJapanUnknown status
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Miyagi-gunJapanUnknown status
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ObihiroJapanUnknown status
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SagamiharaJapanUnknown status
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SakaiJapanUnknown status
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SapporoJapanUnknown status
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SendaiJapanUnknown status
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TachikawaJapanUnknown status
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YokohamaJapanUnknown status
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AguascalientesMexicoUnknown status
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DurangoMexicoUnknown status
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MonterreyMexicoUnknown status
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MonterreyMexicoUnknown status
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VeracruzMexicoUnknown status
Hospital Cuf Descobertas S.A.
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LisbonPortugalCompleted
Hospital De Santa Maria E.P.E.
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LisbonPortugalCompleted
Centro Hospitalar Universitario Lisboa Central E.P.E.
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LisbonPortugalCompleted
Centro Hospitalar Universitário de Santo Antonio,E.P.E.
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PortoPortugalCompleted
Killasli Medical AB
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AlvsjoSwedenCompleted
CTC Clinical Trial Consultants AB
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MoelndalSwedenCompleted
Region Oerebro Laen
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OrebroSwedenCompleted
University of New Mexico Comprehensive Cancer Center- Site Number : 8401263
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AlbuquerqueUnited StatesUnknown status
Arlington Research Center- Site Number : 8401248
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ArlingtonUnited StatesUnknown status
Care Access - Arlington- Site Number : 8401134
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ArlingtonUnited StatesUnknown status
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BexleyUnited StatesUnknown status
Tufts Medical Center Site Number : 8401201
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BostonUnited StatesUnknown status
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Bowling GreenUnited StatesUnknown status
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BrooklynUnited StatesUnknown status
Velocity Clinical Research - Springdale- Site Number : 8401153
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CincinnatiUnited StatesUnknown status
Columbia Dermatology & Aesthetics- Site Number : 8401166
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ColumbiaUnited StatesUnknown status
AllerVie Clinical Research - Columbus- Site Number : 8401104
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ColumbusUnited StatesUnknown status
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Coral GablesUnited StatesUnknown status
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CovingtonUnited StatesUnknown status
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DallasUnited StatesUnknown status
Red River Research Partners- Site Number : 8401196
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FargoUnited StatesUnknown status
University of Connecticut Health Center- Site Number : 8401115
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FarmingtonUnited StatesUnknown status
First Georgia Physician Group- Site Number : 8401190
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FayettevilleUnited StatesUnknown status
Velocity Clinical Research - Hampton- Site Number : 8401154
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HamptonUnited StatesUnknown status
Care Access - Hoboken- Site Number : 8401132
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HobokenUnited StatesUnknown status
Skin Care Research - Hollywood- Site Number : 8401071
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HollywoodUnited StatesUnknown status
Prolato Clinical Research Center- Site Number : 8401209
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HoustonUnited StatesUnknown status
Center for Clinical Studies - Houston - Binz Street- Site Number : 8401063
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HoustonUnited StatesUnknown status
University Of Mississippi Medical Center- Site Number : 8401184
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JacksonUnited StatesUnknown status
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LomitaUnited StatesUnknown status
Dermatology Research Associates - Los Angeles- Site Number : 8401092
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Los AngelesUnited StatesUnknown status
Care Access Research - Marriottsville- Site Number : 8401126
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MarriottsvilleUnited StatesUnknown status
Savin Medical Group - Miami- Site Number : 8401085
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MiamiUnited StatesUnknown status
Anchor Medical Research- Site Number : 8401300
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MiamiUnited StatesUnknown status
Allergy & Asthma Associates of Southern California - Mission Viejo- Site Number : 8401079
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Mission ViejoUnited StatesUnknown status
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Missouri CityUnited StatesUnknown status
Equity Medical- Site Number : 8401239
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New YorkUnited StatesUnknown status
Advanced Research Institute - Odgen- Site Number : 8401057
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OgdenUnited StatesUnknown status
Accel Research - Nona Pediatric Center- Site Number : 8401081
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OrlandoUnited StatesUnknown status
Cura Clinical Research - Oxnard- Site Number : 8401142
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OxnardUnited StatesUnknown status
Dermatology Associates of Plymouth Meeting- Site Number : 8401147
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Plymouth MeetingUnited StatesUnknown status
Nuline Clinical Trial Center- Site Number : 8401161
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Pompano BeachUnited StatesUnknown status
Health Concepts- Site Number : 8401059
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Rapid CityUnited StatesUnknown status
Progressive Clinical Research - San Antonio- Site Number : 8401016
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San AntonioUnited StatesUnknown status
Clinical Science Institute- Site Number : 8401028
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Santa MonicaUnited StatesUnknown status
Center for Dermatology and Plastic Surgery- Site Number : 8401119
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ScottsdaleUnited StatesUnknown status
Clinical Research Trials of Florida- Site Number : 8401023
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TampaUnited StatesUnknown status
Montefiore Medical Center - Moses Campus- Site Number : 8401150
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The BronxUnited StatesUnknown status
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TucsonUnited StatesUnknown status
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Upper Saint ClairUnited StatesUnknown status
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BoksburgSouth AfricaUnknown status
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Cape TownSouth AfricaUnknown status
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Cape TownSouth AfricaUnknown status
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DurbanSouth AfricaUnknown status
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DurbanSouth AfricaUnknown status
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JohannesburgSouth AfricaUnknown status
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JohannesburgSouth AfricaUnknown status
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PretoriaSouth AfricaUnknown status
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AntalyaTurkey (Türkiye)Unknown status
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IstanbulTurkey (Türkiye)Unknown status
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IstanbulTurkey (Türkiye)Unknown status
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IstanbulTurkey (Türkiye)Unknown status
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KayseriTurkey (Türkiye)Unknown status
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MersinTurkey (Türkiye)Unknown status
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SamsunTurkey (Türkiye)Unknown status

This page is information, not medical advice. Discuss any trial with your doctor.