Comparison Trial of OPA-15406 Ointment in Adult Patients With Atopic DermatitisSyndrome

Study Overview
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Brief Summary
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To demonstrate the superiority of IMP (1% OPA-15406 ointment or vehicle) to the vehicle when administered twice daily for 4 weeks using success rate in Investigator's Global Assessment (IGA) at Week 4 as the primary endpoint in adult patients with AD.

Official Title
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A Multicenter, Randomized, Double-blind, Vehicle Controlled, Parallel-group Comparison Trial to Demonstrate the Superiority of 1% OPA-15406 Ointment to the Vehicle in Adult Patients With Atopic Dermatitis (Phase 3 Trial)

Conditions
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Atopic Dermatitis

Intervention / Treatment
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* Drug: 1% OPA-15406
* Drug: Placebos


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Diagnosis of AD based on the Japanese Dermatological Association's criteria History of AD for at least 3 years Atopic dermatitis affecting more than or equal to 5%, to less than or equal to 40% of body surface area (BSA, excluding scalp) at the screening and baseline examinations IGA score of 2 or 3 at the screening and baseline examinations Exclusion Criteria: Subjects who have an AD or contact dermatitis flare-up defined as a rapid intensification of AD, within 28 days prior to the baseline examination

Ages Eligible for Study
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Minimum Age: 15 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 1% OPA-15406<br>Twice daily | Drug: 1% OPA-15406<br>* Twice daily<br>|
| Placebo Comparator: Placebo<br>Twice daily | Drug: Placebos<br>* Twice daily<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Responder Rate of Investigator's Global Assesment(IGA) of Disease Severity | The investigator or subinvestigator assessed the skin symptoms using IGA. The investigator or subinvestigator scored the severity (0 = clear, 1 = almost clear, 2 =mild, 3 = moderate, 4 = severe/very severe) of the overall symptoms of the treatment area (erythema, infiltration, papules, effusion and scab formation) from baseline to Week 4. Incidence of success in IGA is defined as the rate of subjects whose IGA score is 0 (clear) or 1 (almost clear) and has improved by at least 2 grades (responders) from baseline. | At Week 4 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change From Baseline in Eczema Area and Severity Index (EASI) Score | The investigator or sub investigator assessed the symptoms of AD using EASI. EASI's minimum and maximum scores are 0 and 72 scores respectively. The higher the EASI score is, the more severe the symptoms of AD, and a negative change from the baseline means improvement and a positive change means worsening. The investigator or sub investigator scored the severity (0-3 points) and affected BSA (%) based on the 4 symptoms (erythema, infiltration/papules, excoriation, and lichenification) on the 4 body regions (face, neck and head ; upper limbs ;trunk; and lower limbs). | Baseline, Week 4 | 
| Change From Baseline in Verbal Rating Scale (VRS) for Pruritus Score | The investigator or subinvestigator evaluated the pruritus intensity based on VRS. The subjects evaluated the pruritus intensity according to the following criteria. The subjects recorded the level of pruritus and the time and date of evaluation in a pruritus diary. 0: None Mild Moderate Severe | Baseline, Week 4 |