| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
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| E.1.1.1 | Medical condition in easily understood language  | 
| Atopic dermatitis also known as Eczema | 
 
 
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| E.1.1.2 | Therapeutic area  | Diseases [C] - Skin and Connective Tissue Diseases [C17] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 21.1 | 
 
| E.1.2 | Level  | LLT | 
 
| E.1.2 | Classification code  | 10003639 | 
 
| E.1.2 | Term  | Atopic dermatitis | 
 
| E.1.2 | System Organ Class  | 100000004858 | 
 
 
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| E.1.3 | Condition being studied is a rare disease  |  No  | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial  | 
| To test the hypothesis that baricitinib 4 mg + topical corticosteroids (TCS) or baricitinib 2 mg + TCS is superior to placebo + TCS in the treatment of moderate to severe atopic dermatitis | 
 
 
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| E.2.2 | Secondary objectives of the trial  | 
•  To test the hypothesis that baricitinib 1 mg + topical corticosteroids (TCS) is superior to placebo + TCS in the treatment of patients with moderate to severe atopic dermatitis. • To compare the efficacy of baricitinib 4 mg + TCS, baricitinib 2 mg + TCS, or baricitinib 1 mg + TCS to placebo + TCS in atopic dermatitis during the double blind placebo controlled treatment period as measured by improvement of signs and symptoms of atopic dermatitis. • To compare the efficacy of baricitinib 4 mg + TCS, baricitinib 2 mg + TCS, or baricitinib 1 mg + TCS to placebo + TCS in atopic dermatitis during the double blind placebo controlled treatment period as assessed by patient reported outcome measures. 
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| E.2.3 | Trial contains a sub-study  |  Yes  | 
| E.2.3.1 | Full title, date and version of each sub-study and their related objectives | 
Randomized DownTitration Substudy at week 52 During the long term extension (Period 3), eligible patients will participate in a downtitration substudy.  The objective of the substudy is to evaluate the possibility of maintaining efficacy with a lower dose of baricitinib in patients with response (IGA 0 or 1) or partial response (IGA 2) to baricitinib 2-mg QD or 4-mg QD in combination with topical corticosteroids. 
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| E.3 | Principal inclusion criteria  | 
•  Have been diagnosed with moderate to severe Atopic Eczema (Atopic Dermatitis) for at least 12 months. •  Have had inadequate response or intolerance to existing topical (applied to the skin) medications within 6 months preceding screening. •  Are willing to discontinue certain treatments for eczema (such as systemic and topical treatments during a washout period and throughout the study). •  Agree to use emollients daily. •  Have a medical contraindication to cyclosporine A, or had intolerance and/or unacceptable toxicity or inadequate response to cyclosporine A in the past. 
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| E.4 | Principal exclusion criteria | 
•  Are currently experiencing or have a history of other concomitant skin conditions (e.g., psoriasis or lupus erythematosus), or a history of erythrodermic, refractory, or unstable skin disease that requires frequent hospitalizations and/or intravenous treatment for skin infections. •  A history of eczema herpeticum within 12 months, and/or a history of 2 or more episodes of eczema herpeticum in the past. •  Participants who are currently experiencing a skin infection that requires treatment, or are currently being treated, with topical or systemic antibiotics. •  Have any serious illness that is anticipated to require the use of systemic corticosteroids or otherwise interfere with study participation or require active frequent monitoring (e.g., unstable chronic asthma). • Have been treated with the following therapies: - Monoclonal antibody for less than 5 half-lives prior to randomization. - Received prior treatment with any oral Janus kinase (JAK) inhibitor. - Received any parenteral corticosteroids administered by intramuscular or intravenous (IV) injection within 2 weeks prior to study entry or within 6 weeks prior to planned randomization or are anticipated to require parenteral injection of corticosteroids during the study. - Have had an intra-articular corticosteroid injection within 2 weeks prior to study entry or within 6 weeks prior to planned randomization. •  Have high blood pressure characterized by a repeated systolic blood pressure >160 millimeters of mercury (mm Hg) or diastolic blood pressure >100 mm Hg. •  Have had major surgery within the past eight weeks or are planning major surgery during the study. •  Have experienced any of the following within 12 weeks of screening: venous thromboembolic event (VTE), myocardial infarction (MI), unstable ischemic heart disease, stroke, or New York Heart Association Stage III/IV heart failure. •  Have a history of recurrent (≥ 2) VTE or are considered at high risk of VTE as deemed by the investigator. •  Have a history or presence of cardiovascular, respiratory, hepatic, chronic liver disease gastrointestinal, endocrine, hematological, neurological, lymphoproliferative disease or neuropsychiatric disorders or any other serious and/or unstable illness. •  Have a current or recent clinically serious viral, bacterial, fungal, or parasitic infection including herpes zoster, tuberculosis. •  Have specific laboratory abnormalities. •  Have received certain treatments that are contraindicated. •  Pregnant or breastfeeding. 
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| E.5 End points | 
| E.5.1 | Primary end point(s) | 
Proportion of patients achieving Investigator’s Global Assessment (IGA) of 0 or 1 with a ≥ 2 point improvement 
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| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
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| E.5.2 | Secondary end point(s) | 
1, • Proportion of patients achieving Investigator’s Global Assessment (IGA) of 0 or 1 with a ≥ 2 point improvement • Proportion of patients achieving EASI75  • Proportion of patients achieving EASI 90  • Mean change from baseline in EASI score • Proportion of patients achieving SCORAD75 • Mean change from baseline in Skin Pain NRS 
 2; • Proportion of patients achieving a 4-point improvement in Itch NRS 3; • Mean change from baseline in the score of Item 2 of the ADSS 4; • Proportion of patients achieving IGA of 0 or 1 with a ≥2-point improvement from baseline • Proportion of patients achieving EASI75 
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| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
1; assessed at week 16 2; assessed at 16, 4, 2, and 1 weeks 3; assessed at 16 weeks and 1 week. 4; assessed at 24 weeks | 
 
 
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| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis |  No  | 
| E.6.2 | Prophylaxis |  No  | 
| E.6.3 | Therapy |  Yes  | 
| E.6.4 | Safety |  Yes  | 
| E.6.5 | Efficacy |  Yes  | 
| E.6.6 | Pharmacokinetic |  No  | 
| E.6.7 | Pharmacodynamic |  No  | 
| E.6.8 | Bioequivalence |  No  | 
| E.6.9 | Dose response |  Yes  | 
| E.6.10 | Pharmacogenetic |  Yes  | 
| E.6.11 | Pharmacogenomic |  Yes  | 
| E.6.12 | Pharmacoeconomic |  Yes  | 
| E.6.13 | Others |  Yes  | 
| E.6.13.1 | Other scope of the trial description | 
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| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) |  No  | 
| E.7.1.1 | First administration to humans |  No  | 
| E.7.1.2 | Bioequivalence study |  No  | 
| E.7.1.3 | Other |  No  | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) |  No  | 
| E.7.3 | Therapeutic confirmatory (Phase III) |  Yes  | 
| E.7.4 | Therapeutic use (Phase IV) |  No  | 
| E.8 Design of the trial | 
| E.8.1 | Controlled |  Yes  | 
| E.8.1.1 | Randomised |  Yes  | 
| E.8.1.2 | Open |  No  | 
| E.8.1.3 | Single blind |  No  | 
| E.8.1.4 | Double blind  |  Yes  | 
| E.8.1.5 | Parallel group |  Yes  | 
| E.8.1.6 | Cross over  |  No  | 
| E.8.1.7 | Other |  Yes  | 
| E.8.1.7.1 | Other trial design description | 
| 96 additional weeks bridging extension | 
 
 
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| E.8.2 |  Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) |  No  | 
| E.8.2.2 | Placebo  |  Yes  | 
| E.8.2.3 | Other |  No  | 
| E.8.2.4 | Number of treatment arms in the trial | 4 | 
| E.8.3 | 
                                The trial involves single site in the Member State concerned
                             |  No  | 
| E.8.4 |  The trial involves multiple sites in the Member State concerned  |  Yes  | 
| E.8.4.1 | Number of sites anticipated in Member State concerned | 6 | 
| E.8.5 | The trial involves multiple Member States |  Yes  | 
| E.8.5.1 | Number of sites anticipated in the EEA | 71 | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA |  Yes  | 
| E.8.6.2 | Trial being conducted completely outside of the EEA |  No  | 
| E.8.6.3 | If E.8.6.1 or E.8.6.2 are Yes, specify the regions in which trial sites are planned | 
| Australia | 
 
| Austria | 
 
| Belgium | 
 
| Brazil | 
 
| Finland | 
 
| France | 
 
| Germany | 
 
| Italy | 
 
| Japan | 
 
| Netherlands | 
 
| Poland | 
 
| Russian Federation | 
 
| Spain | 
 
| Switzerland | 
 
| United Kingdom | 
 
 
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| E.8.7 | Trial has a data monitoring committee |  Yes  | 
| E.8.8 | 
                        Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial
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| End of the study is the date of the last visit or last scheduled procedure shown in the Schedule of Activities for the last patient. | 
 
 
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| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 5 | 
| E.8.9.1 | In the Member State concerned months | 1 | 
| E.8.9.1 | In the Member State concerned days | 29 | 
| E.8.9.2 | In all countries concerned by the trial years | 5 | 
| E.8.9.2 | In all countries concerned by the trial months | 1 | 
| E.8.9.2 | In all countries concerned by the trial days | 29 |