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
- Diseases
- Atopic dermatitis (eczema)
- 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
Sites (143)
Sites in registry order. Pick your city on the disease page to sort them by distance.
| Site | City | Country | Site status |
|---|---|---|---|
| - Coordinator of this site? Confirm its status | Berazategui | Argentina | Unknown status |
| - Coordinator of this site? Confirm its status | Buenos Aires | Argentina | Unknown status |
| - Coordinator of this site? Confirm its status | Buenos Aires | Argentina | Unknown status |
| - Coordinator of this site? Confirm its status | Buenos Aires | Argentina | Unknown status |
| - Coordinator of this site? Confirm its status | Buenos Aires | Argentina | Unknown status |
| - Coordinator of this site? Confirm its status | Pilar | Argentina | Unknown status |
| - Coordinator of this site? Confirm its status | Rosario | Argentina | Unknown status |
| - Coordinator of this site? Confirm its status | Rosario | Argentina | Unknown status |
| - Coordinator of this site? Confirm its status | Rosario | Argentina | Unknown status |
| Multiprofile Hospital For Active Treatment "Dr. Tota Venkova" AD Coordinator of this site? Confirm its status | Gabrovo | Bulgaria | Completed |
| Medical Center Medconsult Pleven OOD Coordinator of this site? Confirm its status | Pleven | Bulgaria | Completed |
| Diagnostic-Consultative Center Alexandrovska EOOD Coordinator of this site? Confirm its status | Sofiya | Bulgaria | Completed |
| - Coordinator of this site? Confirm its status | Quillota | Chile | Unknown status |
| - Coordinator of this site? Confirm its status | Santiago | Chile | Unknown status |
| - Coordinator of this site? Confirm its status | Santiago | Chile | Unknown status |
| - Coordinator of this site? Confirm its status | Santiago | Chile | Unknown status |
| - Coordinator of this site? Confirm its status | Valdivia | Chile | Unknown status |
| - Coordinator of this site? Confirm its status | Beijing | China | Unknown status |
| - Coordinator of this site? Confirm its status | Beijing | China | Unknown status |
| - Coordinator of this site? Confirm its status | Chengdu | China | Unknown status |
| - Coordinator of this site? Confirm its status | Guangzhou | China | Unknown status |
| - Coordinator of this site? Confirm its status | Guangzhou | China | Unknown status |
| - Coordinator of this site? Confirm its status | Hangzhou | China | Unknown status |
| - Coordinator of this site? Confirm its status | Hangzhou | China | Unknown status |
| - Coordinator of this site? Confirm its status | Hangzhou | China | Unknown status |
| - Coordinator of this site? Confirm its status | Jinan | China | Unknown status |
| - Coordinator of this site? Confirm its status | Ningbo | China | Unknown status |
| - Coordinator of this site? Confirm its status | Shanghai | China | Unknown status |
| - Coordinator of this site? Confirm its status | Shanghai | China | Unknown status |
| - Coordinator of this site? Confirm its status | Shenyang | China | Unknown status |
| - Coordinator of this site? Confirm its status | Wenzhou | China | Unknown status |
| - Coordinator of this site? Confirm its status | Wuxi | China | Unknown status |
| - Coordinator of this site? Confirm its status | Zhenjiang | China | Unknown status |
| Kozni ambulance Kutna Hora s.r.o. Coordinator of this site? Confirm its status | Hlouska | Czechia | Completed |
| CCR Ostrava s.r.o. Coordinator of this site? Confirm its status | Moravska Ostrava A Privoz | Czechia | Completed |
| AGE Centrum s.r.o. Coordinator of this site? Confirm its status | Olomouc | Czechia | Completed |
| Kozni ambulance Fialova, s.r.o. Coordinator of this site? Confirm its status | Prague | Czechia | Completed |
| Praglandia s.r.o. Coordinator of this site? Confirm its status | Prague | Czechia | Completed |
| Aalborg University Hospital Coordinator of this site? Confirm its status | Aalborg | Denmark | Completed |
| Aarhus Universitetshospital Coordinator of this site? Confirm its status | Aarhus N | Denmark | Completed |
| Sanos A/S Coordinator of this site? Confirm its status | Herlev | Denmark | Completed |
| Hospital Universitario Virgen de las Nieves Coordinator of this site? Confirm its status | Granada | Spain | Completed |
| El Hospital Universitario De Gran Canaria Dr. Negrin Coordinator of this site? Confirm its status | Las Palmas De Gran Canaria | Spain | Completed |
| Hospital Universitario La Paz Coordinator of this site? Confirm its status | Madrid | Spain | Completed |
| Hospital General Universitario Gregorio Marañón Coordinator of this site? Confirm its status | Madrid | Spain | Completed |
| - Coordinator of this site? Confirm its status | Glasgow | United Kingdom | Unknown status |
| - Coordinator of this site? Confirm its status | Leicester | United Kingdom | Unknown status |
| - Coordinator of this site? Confirm its status | London | United Kingdom | Unknown status |
| - Coordinator of this site? Confirm its status | London | United Kingdom | Unknown status |
| - Coordinator of this site? Confirm its status | Portsmouth | United Kingdom | Unknown status |
| Azienda Ospedaliero-Universitaria Policlinico G. Rodolico-San Marco Di Catania Coordinator of this site? Confirm its status | Catania | Italy | Completed |
| Azienda Ospedaliero Universitaria Pisana Coordinator of this site? Confirm its status | Pisa | Italy | Completed |
| Azienda Ospedaliera Policlinico Universitario Tor Vergata Coordinator of this site? Confirm its status | Rome | Italy | Completed |
| Humanitas Research Hospital Coordinator of this site? Confirm its status | Rozzano | Italy | Completed |
| Azienda Unita Locale Socio Sanitaria N 8 Berica Coordinator of this site? Confirm its status | Vicenza | Italy | Completed |
| - Coordinator of this site? Confirm its status | Chitose | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Chūō | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Habikino | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Iruma | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Kagoshima | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Kobe | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Kyoto | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Kyoto | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Mibu | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Minato | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Miyagi-gun | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Obihiro | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Sagamihara | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Sakai | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Sapporo | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Sendai | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Tachikawa | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Yokohama | Japan | Unknown status |
| - Coordinator of this site? Confirm its status | Aguascalientes | Mexico | Unknown status |
| - Coordinator of this site? Confirm its status | Durango | Mexico | Unknown status |
| - Coordinator of this site? Confirm its status | Monterrey | Mexico | Unknown status |
| - Coordinator of this site? Confirm its status | Monterrey | Mexico | Unknown status |
| - Coordinator of this site? Confirm its status | Veracruz | Mexico | Unknown status |
| Hospital Cuf Descobertas S.A. Coordinator of this site? Confirm its status | Lisbon | Portugal | Completed |
| Hospital De Santa Maria E.P.E. Coordinator of this site? Confirm its status | Lisbon | Portugal | Completed |
| Centro Hospitalar Universitario Lisboa Central E.P.E. Coordinator of this site? Confirm its status | Lisbon | Portugal | Completed |
| Centro Hospitalar Universitário de Santo Antonio,E.P.E. Coordinator of this site? Confirm its status | Porto | Portugal | Completed |
| Killasli Medical AB Coordinator of this site? Confirm its status | Alvsjo | Sweden | Completed |
| CTC Clinical Trial Consultants AB Coordinator of this site? Confirm its status | Moelndal | Sweden | Completed |
| Region Oerebro Laen Coordinator of this site? Confirm its status | Orebro | Sweden | Completed |
| University of New Mexico Comprehensive Cancer Center- Site Number : 8401263 Coordinator of this site? Confirm its status | Albuquerque | United States | Unknown status |
| Arlington Research Center- Site Number : 8401248 Coordinator of this site? Confirm its status | Arlington | United States | Unknown status |
| Care Access - Arlington- Site Number : 8401134 Coordinator of this site? Confirm its status | Arlington | United States | Unknown status |
| - Coordinator of this site? Confirm its status | Bexley | United States | Unknown status |
| Tufts Medical Center Site Number : 8401201 Coordinator of this site? Confirm its status | Boston | United States | Unknown status |
| - Coordinator of this site? Confirm its status | Bowling Green | United States | Unknown status |
| - Coordinator of this site? Confirm its status | Brooklyn | United States | Unknown status |
| Velocity Clinical Research - Springdale- Site Number : 8401153 Coordinator of this site? Confirm its status | Cincinnati | United States | Unknown status |
| Columbia Dermatology & Aesthetics- Site Number : 8401166 Coordinator of this site? Confirm its status | Columbia | United States | Unknown status |
| AllerVie Clinical Research - Columbus- Site Number : 8401104 Coordinator of this site? Confirm its status | Columbus | United States | Unknown status |
| - Coordinator of this site? Confirm its status | Coral Gables | United States | Unknown status |
| - Coordinator of this site? Confirm its status | Covington | United States | Unknown status |
| - Coordinator of this site? Confirm its status | Dallas | United States | Unknown status |
| Red River Research Partners- Site Number : 8401196 Coordinator of this site? Confirm its status | Fargo | United States | Unknown status |
| University of Connecticut Health Center- Site Number : 8401115 Coordinator of this site? Confirm its status | Farmington | United States | Unknown status |
| First Georgia Physician Group- Site Number : 8401190 Coordinator of this site? Confirm its status | Fayetteville | United States | Unknown status |
| Velocity Clinical Research - Hampton- Site Number : 8401154 Coordinator of this site? Confirm its status | Hampton | United States | Unknown status |
| Care Access - Hoboken- Site Number : 8401132 Coordinator of this site? Confirm its status | Hoboken | United States | Unknown status |
| Skin Care Research - Hollywood- Site Number : 8401071 Coordinator of this site? Confirm its status | Hollywood | United States | Unknown status |
| Prolato Clinical Research Center- Site Number : 8401209 Coordinator of this site? Confirm its status | Houston | United States | Unknown status |
| Center for Clinical Studies - Houston - Binz Street- Site Number : 8401063 Coordinator of this site? Confirm its status | Houston | United States | Unknown status |
| University Of Mississippi Medical Center- Site Number : 8401184 Coordinator of this site? Confirm its status | Jackson | United States | Unknown status |
| - Coordinator of this site? Confirm its status | Lomita | United States | Unknown status |
| Dermatology Research Associates - Los Angeles- Site Number : 8401092 Coordinator of this site? Confirm its status | Los Angeles | United States | Unknown status |
| Care Access Research - Marriottsville- Site Number : 8401126 Coordinator of this site? Confirm its status | Marriottsville | United States | Unknown status |
| Savin Medical Group - Miami- Site Number : 8401085 Coordinator of this site? Confirm its status | Miami | United States | Unknown status |
| Anchor Medical Research- Site Number : 8401300 Coordinator of this site? Confirm its status | Miami | United States | Unknown status |
| Allergy & Asthma Associates of Southern California - Mission Viejo- Site Number : 8401079 Coordinator of this site? Confirm its status | Mission Viejo | United States | Unknown status |
| - Coordinator of this site? Confirm its status | Missouri City | United States | Unknown status |
| Equity Medical- Site Number : 8401239 Coordinator of this site? Confirm its status | New York | United States | Unknown status |
| Advanced Research Institute - Odgen- Site Number : 8401057 Coordinator of this site? Confirm its status | Ogden | United States | Unknown status |
| Accel Research - Nona Pediatric Center- Site Number : 8401081 Coordinator of this site? Confirm its status | Orlando | United States | Unknown status |
| Cura Clinical Research - Oxnard- Site Number : 8401142 Coordinator of this site? Confirm its status | Oxnard | United States | Unknown status |
| Dermatology Associates of Plymouth Meeting- Site Number : 8401147 Coordinator of this site? Confirm its status | Plymouth Meeting | United States | Unknown status |
| Nuline Clinical Trial Center- Site Number : 8401161 Coordinator of this site? Confirm its status | Pompano Beach | United States | Unknown status |
| Health Concepts- Site Number : 8401059 Coordinator of this site? Confirm its status | Rapid City | United States | Unknown status |
| Progressive Clinical Research - San Antonio- Site Number : 8401016 Coordinator of this site? Confirm its status | San Antonio | United States | Unknown status |
| Clinical Science Institute- Site Number : 8401028 Coordinator of this site? Confirm its status | Santa Monica | United States | Unknown status |
| Center for Dermatology and Plastic Surgery- Site Number : 8401119 Coordinator of this site? Confirm its status | Scottsdale | United States | Unknown status |
| Clinical Research Trials of Florida- Site Number : 8401023 Coordinator of this site? Confirm its status | Tampa | United States | Unknown status |
| Montefiore Medical Center - Moses Campus- Site Number : 8401150 Coordinator of this site? Confirm its status | The Bronx | United States | Unknown status |
| - Coordinator of this site? Confirm its status | Tucson | United States | Unknown status |
| - Coordinator of this site? Confirm its status | Upper Saint Clair | United States | Unknown status |
| - Coordinator of this site? Confirm its status | Boksburg | South Africa | Unknown status |
| - Coordinator of this site? Confirm its status | Cape Town | South Africa | Unknown status |
| - Coordinator of this site? Confirm its status | Cape Town | South Africa | Unknown status |
| - Coordinator of this site? Confirm its status | Durban | South Africa | Unknown status |
| - Coordinator of this site? Confirm its status | Durban | South Africa | Unknown status |
| - Coordinator of this site? Confirm its status | Johannesburg | South Africa | Unknown status |
| - Coordinator of this site? Confirm its status | Johannesburg | South Africa | Unknown status |
| - Coordinator of this site? Confirm its status | Pretoria | South Africa | Unknown status |
| - Coordinator of this site? Confirm its status | Antalya | Turkey (Türkiye) | Unknown status |
| - Coordinator of this site? Confirm its status | Istanbul | Turkey (Türkiye) | Unknown status |
| - Coordinator of this site? Confirm its status | Istanbul | Turkey (Türkiye) | Unknown status |
| - Coordinator of this site? Confirm its status | Istanbul | Turkey (Türkiye) | Unknown status |
| - Coordinator of this site? Confirm its status | Kayseri | Turkey (Türkiye) | Unknown status |
| - Coordinator of this site? Confirm its status | Mersin | Turkey (Türkiye) | Unknown status |
| - Coordinator of this site? Confirm its status | Samsun | Turkey (Türkiye) | Unknown status |
This page is information, not medical advice. Discuss any trial with your doctor.