A Phase 3 interventional study of Amlitelimab and Placebo in Dermatitis Atopic, sponsored by Sanofi. Active, not recruiting at 150 sites in 23 countries. Open to participants aged 12 Years and older. Per ClinicalTrials.gov, last updated 2026-08-27.
Sponsored by Sanofi · Phase 3, Interventional, and Treatment
This is a parallel group, Phase 3, multinational, multicenter, randomized, double-blind, placebo-controlled, 3-arm study for treatment of participants diagnosed with moderate-to-severe AD on background TCS who have had inadequate response to prior biologic or oral JAKi therapy.
The purpose of this study is to measure the efficacy and safety of treatment with amlitelimab solution for subcutaneous (SC) injection compared with placebo in participants with moderate-to-severe AD aged 12 years and older on background TCS and have had an inadequate response to prior biologic or an oral JAKi therapy.
Study details include:
At the end of the treatment period, participants will have the option to enter the Long-Term Safety Study LTS17367 (RIVER-AD).
The study duration will be up to 56 weeks for participants not entering the long-term safety study (LTS17367 [RIVER-AD]) including a 2 to 4-week screening, a 36-week randomized double-blind period, and a 16-week safety follow-up.
The study duration will be up to 40 weeks for participants entering the long-term safety study (LTS17367 [RIVER-AD]) including a 2 to 4-week screening and a 36-week randomized double-blind period.
The total treatment duration will be up to 36 weeks. The total number of visits will be up to 13 visits (or 12 visits for those entering the long-term safety study LTS17367 [RIVER-AD] study).
Exclusion Criteria:
Participants are excluded from the study if any of the following criteria apply:
The above information is not intended to contain all considerations relevant to a potential participation in a clinical trial
Subcutaneous injection as per protocol
Drug: Amlitelimab · Drug: Topical corticosteroids · Drug: Topical tacrolimus or pimecrolimus
Subcutaneous injection as per protocol
Drug: Amlitelimab · Drug: Topical corticosteroids · Drug: Topical tacrolimus or pimecrolimus
Subcutaneous injection as per protocol
Drug: Placebo · Drug: Topical corticosteroids · Drug: Topical tacrolimus or pimecrolimus
Pharmaceutical form: Injection solution Route of administration: Subcutaneous
Also known as: SAR445229
Pharmaceutical form: Injection solution Route of administration: Subcutaneous
Pharmaceutical form: Various Topical formulation Route of administration: Topical
Pharmaceutical form: Various Topical formulation Route of administration: Topical
EU, EU reference countries, and Japan: Proportion of participants with Validated Investigator Global Assessment scale for Atopic Dermatitis (vIGA-AD) of 0 (clear) or 1 (almost clear) and a reduction from baseline of ≥2 points at Week 36
The vIGA-AD is an Investigator-completed assessment scale used to determine severity of AD and clinical response to treatment. It is based on a 5-point scale, ranging from 0 (clear) to 4 (severe).
Time frame: Week 36
EU, EU reference countries, and Japan: Proportion of participants reaching 75% reduction from baseline in Eczema Area and Severity Index (EASI) score (EASI75) at Week 36
The EASI is an Investigator-assessed validated tool used to measure the extent (area) and severity of AD. Total score ranges from 0 to 72 with a higher score indicating increased extent and severity of AD.
Time frame: Week 36
US and US reference countries: Proportion of participants with vIGA-AD of 0 (clear) or 1 (almost clear) and a reduction from baseline of ≥2 points at Week 36
The vIGA-AD is an Investigator-completed assessment scale used to determine severity of AD and clinical response to treatment. It is based on a 5-point scale, ranging from 0 (clear) to 4 (severe).
Time frame: Week 36
Proportion of participants reaching EASI-75 at Week 36 (for US and US reference countries only)
The EASI is an Investigator-assessed validated tool used to measure the extent (area) and severity of AD. Total score ranges from 0 to 72 with a higher score indicating increased extent and severity of AD. EASI-75 is 75% reduction from baseline in EASI score.
Time frame: Week 36
Proportion of participants with vIGA-AD 0 (clear) or 1 (almost clear) with presence of only barely perceptible erythema (no induration/papulation, no lichenification, no oozing or crusting and a reduction from baseline of ≥2 points)
The vIGA-AD is an Investigator-completed assessment scale used to determine severity of AD and clinical response to treatment. It is based on a 5-point scale, ranging from 0 (clear) to 4 (severe).
Time frame: Baseline to Week 36
Proportion of participants with ≥4-point reduction in weekly average of daily Peak Pruritus-Numerical Rating Scale (PP-NRS) from baseline in participants with baseline weekly average of daily PP-NRS ≥4
The PP-NRS is a validated single item 0-10 numeric rating scale assessing peak pruritus (itch) associated with AD with 0 = no itch and 10 = worst itch imaginable.
Time frame: Baseline to Week 36
Proportion of participants reaching EASI-75
The EASI is an Investigator-assessed validated tool used to measure the extent (area) and severity of AD. Total score ranges from 0 to 72 with a higher score indicating increased extent and severity of AD. EASI-75 is 75% reduction from baseline in EASI score.
Time frame: Baseline to Week 24
Proportion of participants with vIGA-AD of 0 (clear) or 1 (almost clear) and a reduction from baseline of ≥2 points
The vIGA-AD is an Investigator-completed assessment scale used to determine severity of AD and clinical response to treatment. It is based on a 5-point scale, ranging from 0 (clear) to 4 (severe).
Time frame: Baseline to Week 24
Proportion of participants reaching EASI-90
The EASI is an Investigator-assessed validated tool used to measure the extent (area) and severity of AD. Total score ranges from 0 to 72 with a higher score indicating increased extent and severity of AD. EASI-90 is 90% reduction from baseline in EASI score.
Time frame: Baseline to Week 36
Proportion of participants reaching EASI-100
The EASI is an Investigator-assessed validated tool used to measure the extent (area) and severity of AD. Total score ranges from 0 to 72 with a higher score indicating increased extent and severity of AD. EASI-100 is 100% reduction from baseline in EASI score.
Time frame: Baseline to Week 36
Proportion of participants with PP-NRS ≤1
The PP-NRS is a validated single item 0-10 numeric rating scale assessing peak pruritus (itch) associated with AD with 0 = no itch and 10 = worst itch imaginable.
Time frame: Baseline to Week 36
Change in Dermatology Life Quality Index (DLQI) from baseline in participants with age ≥16 years old
The DLQI is a validated 10-item questionnaire to measure dermatology-specific quality of life (QoL) in adult patients. Overall scoring ranges from 0 to 30, with a higher score indicating a poorer QoL.
Time frame: Baseline to Week 36
Proportion of participants with a reduction in DLQI ≥4 from baseline in participants with age ≥16 years old and with DLQI baseline ≥4
The DLQI is a validated 10-item questionnaire to measure dermatology-specific quality of life (QoL) in adult patients. Overall scoring ranges from 0 to 30, with a higher score indicating a poorer QoL.
Time frame: Baseline to Week 36
Change in Children Dermatology Life Quality Index (CDLQI) from baseline in participants with age ≥12 to <16 years
The CDLQI is a validated 10-item questionnaire to measure dermatology-specific quality of life (QoL) in children aged 4-\<16 years. Overall scoring ranges from 0 to 30, with a higher score indicating a poorer QoL.
Time frame: Baseline to Week 36
Proportion of participants with a reduction in CDLQI ≥6 from baseline in participants with age ≥12 to <16 years old and with CDLQI baseline ≥6
The CDLQI is a validated 10-item questionnaire to measure dermatology-specific quality of life (QoL) in children aged 4-\<16 years. Overall scoring ranges from 0 to 30, with a higher score indicating a poorer QoL.
Time frame: Baseline to Week 36
Change in Hospital Anxiety Depression Scale (HADS) from baseline
The HADS is 14-item questionnaire with two subscales: anxiety \& depression. Each subscale (anxiety \& depression) ranges 0-21. The total HADS score ranges 0-42 with higher score indicating a poorer state.
Time frame: Baseline to Week 36
Proportion of participants with HADS subscale Anxiety (HADS-A) <8 in participants with baseline HADS-A ≥8
HADS-A score ranges 0-21 with higher score indicating a poorer state.
Time frame: Baseline to Week 36
Proportion of participants with HADS subscale Depression (HADS-D) <8 in participants with HADS-D baseline ≥8
HADS-D score ranges 0-21 with higher score indicating a poorer state.
Time frame: Baseline to Week 36
Absolute change in weekly average of daily Skin Pain-Numerical Rating Scale (SP-NRS) from baseline
The SP-NRS is a single item 0-10 numeric rating scale assessing skin pain associated with AD with 0 = no pain and 10 = worst possible pain imaginable.
Time frame: Baseline to Week 36
Proportion of participants with a reduction in weekly average of daily SP-NRS ≥4 from baseline in participants with baseline weekly average of daily SP-NRS ≥4
The SP-NRS is a single item 0-10 numeric rating scale assessing skin pain associated with AD with 0 = no pain and 10 = worst possible pain imaginable.
Time frame: Baseline to Week 36
Percent change in weekly average of daily SP-NRS from baseline
The SP-NRS is a single item 0-10 numeric rating scale assessing skin pain associated with AD with 0 = no pain and 10 = worst possible pain imaginable.
Time frame: Baseline to Week 36
Proportion of participants with vIGA-AD 0 (clear)
The vIGA-AD is an Investigator-completed assessment scale used to determine severity of AD and clinical response to treatment. It is based on a 5-point scale, ranging from 0 (clear) to 4 (severe).
Time frame: Baseline to Week 36
Absolute change in weekly average of daily Sleep Disturbance-Numerical Rating Scale (SD-NRS) from baseline
The SD-NRS is a single item 0-10 numeric rating scale assessing sleep disturbance associated with AD with 0 = no sleep loss and 10 = did not sleep at all.
Time frame: Baseline to Week 36
Proportion of participants with a reduction in weekly average of daily SD-NRS ≥3 from baseline in participants with Baseline weekly average of daily SD-NRS ≥3
The SD-NRS is a single item 0-10 numeric rating scale assessing sleep disturbance associated with AD with 0 = no sleep loss and 10 = did not sleep at all.
Time frame: Baseline to Week 36
Percent change in weekly average of daily SD-NRS
The SD-NRS is a single item 0-10 numeric rating scale assessing sleep disturbance associated with AD with 0 = no sleep loss and 10 = did not sleep at all.
Time frame: Baseline to Week 36
Percent change in EASI score from baseline
The EASI is an Investigator-assessed validated tool used to measure the extent (area) and severity of AD. Total score ranges from 0 to 72 with a higher score indicating increased extent and severity of AD.
Time frame: Baseline to Week 36
Percent change in weekly average of daily PP-NRS from baseline
The PP-NRS is a validated single item 0-10 numeric rating scale assessing peak pruritus (itch) associated with AD with 0 = no itch and 10 = worst itch imaginable.
Time frame: Baseline to Week 36
Absolute change in weekly average of daily PP-NRS from baseline
The PP-NRS is a validated single item 0-10 numeric rating scale assessing peak pruritus (itch) associated with AD with 0 = no itch and 10 = worst itch imaginable.
Time frame: Baseline to Week 36
Proportion of participants reaching EASI-50
The EASI is an Investigator-assessed validated tool used to measure the extent (area) and severity of AD. Total score ranges from 0 to 72 with a higher score indicating increased extent and severity of AD. EASI-50 is 50% reduction from baseline in EASI score.
Time frame: Baseline to Week 36
Proportion of participants with EASI ≤7
The EASI is an Investigator-assessed validated tool used to measure the extent (area) and severity of AD. Total score ranges from 0 to 72 with a higher score indicating increased extent and severity of AD.
Time frame: Baseline to Week 36
Change in percent Body Surface Area (BSA) affected by AD from baseline
Time frame: Baseline to Week 36
Percent change in Scoring Atopic Dermatitis (SCORAD) index from baseline
The SCORAD index is a clinical tool to evaluate the extent and severity of AD. Total score ranges from 0 (absent disease) to 103 (severe disease).
Time frame: Baseline to Week 36
Absolute change in SCORAD index from baseline
The SCORAD index is a clinical tool to evaluate the extent and severity of AD. Total score ranges from 0 (absent disease) to 103 (severe disease).
Time frame: Baseline to Week 36
Proportion of participants with a reduction in SCORAD ≥ 8.7 points from baseline in participants with baseline SCORAD score ≥ 8.7
The SCORAD index is a clinical tool to evaluate the extent and severity of AD. Total score ranges from 0 (absent disease) to 103 (severe disease).
Time frame: Baseline to Week 36
Proportion of participants with a reduction in Patient Oriented Eczema Measure (POEM) ≥4 from baseline in participants with POEM Baseline ≥4
The POEM is a 7-item self-assessment questionnaire that assesses disease symptoms on a 5-point scale; 0 (no days) to 4 (every day in the last week). The sum of the 7 items gives the total POEM score of 0 (absent disease) to 28 (very severe). Higher scores indicated more severe disease and poor quality of life.
Time frame: Baseline to Week 36
Change in POEM from baseline
The POEM is a 7-item self-assessment questionnaire that assesses disease symptoms on a 5-point scale; 0 (no days) to 4 (every day in the last week). The sum of the 7 items gives the total POEM score of 0 (absent disease) to 28 (very severe). Higher scores indicated more severe disease and poor quality of life.
Time frame: Baseline to Week 36
Proportion of participants with rescue medication use
Time frame: Baseline to Week 36
Time to onset of effect on PP-NRS as measured by proportion of participants with an improvement (reduction) in PP-NRS by ≥4
The PP-NRS is a validated single item 0-10 numeric rating scale assessing peak pruritus (itch) associated with AD with 0 = no itch and 10 = worst itch imaginable.
Time frame: Baseline to Week 36
Percentage of TCS/TCI free days
Time frame: Baseline to Week 36
Percentage of participants who experienced Treatment-Emergent Adverse Events (TEAEs), experienced Treatment-Emergent Serious Adverse Events (TESAEs) and/or Treatment-Emergent Adverse Events of Special Interest (AESI)
Time frame: Baseline to Week 52
Serum amlitelimab concentrations
Time frame: Baseline to Week 52
Incidence of antidrug antibodies (ADAs) of amlitelimab
Time frame: Baseline to Week 52
Time to onset of effect on vIGA-AD as measured by proportion of participants with vIGA-AD 0 (clear) or 1 (almost clear) and a reduction from baseline ≥2 during the 36-week treatment period
The vIGA-AD is an Investigator-completed assessment scale used to determine severity of AD and clinical response to treatment. It is based on a 5-point scale, ranging from 0 (clear) to 4 (severe).
Time frame: Baseline to Week 36
Time to onset of effect on EASI as measured by proportion of participants reaching a 75% reduction from baseline in EASI score during the 36-week treatment period
The EASI is an Investigator-assessed validated tool used to measure the extent (area) and severity of AD. Total score ranges from 0 to 72 with a higher score indicating increased extent and severity of AD. EASI-75 is 75% reduction from baseline in EASI score.
Time frame: Baseline to Week 36
Showing the first 100 of 150 sites across 23 countries.
Plan to share: Yes — Qualified researchers may request access to patient level data and related study documents including the clinical study report, study protocol with any amendments, blank case report form, statistical analysis plan, and dataset specifications. Patient level data will be anonymized and study documents will be redacted to protect the privacy of trial participants. Further details on Sanofi's data sharing criteria, eligible studies, and process for requesting access can be found at: https://vivli.org
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