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Atopic DermatitisPhase 2NCT05923099

A Trial to Evaluate the Efficacy and Safety of Different Doses of LEO 138559 in Adults With Moderate-to-severe Atopic Dermatitis

A Phase 2 study testing LEO 138559 in people with Atopic Dermatitis, run by LEO Pharma at 73 sites in 11 countries.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
Search all trials

Trial summary

The purpose of this trial is to test different doses of the trial medicine (LEO 138559) and see how well they work and how safe they are at treating moderate to severe atopic dermatitis in adults. Read more about this study

Who is it for?
Ages 18 to 75 years
Conditions the study is for
Atopic Dermatitis
What is being tested?
LEO 138559
Type of treatment
Injection or infusion
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
262 participants
Where
73 sitesin 11 countries
Study dates
20 Sep 2023to 9 Apr 2025
Phase
Phase 2
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 75 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Signed and dated informed consent has been obtained prior to any protocol related procedures.
  • 18-75 years old (both included) at screening (Visit 1).
  • Willingness to comply with the clinical trial protocol.
  • At screening, diagnosis of atopic dermatitis (AD) as defined by the Hanifin and Rajka (1980) criteria for AD.
  • History of AD for ≥1 year.
  • Subjects who have a recent history (within 12 months before screening) with documented inadequate response to treatment with topical corticosteroid(s) (TCS) (±topical calcineurin inhibitor(s) (TCI) as appropriate) or for whom these topical AD treatments are medically inadvisable (e.g. due to important side effects or safety risks).
Show all 11Show fewer
  • Eczema Area and Severity Index (EASI) score ≥12 at screening and ≥16 at baseline.
  • Validated Investigator Global Assessment Scale for Atopic Dermatitis (vIGA-AD) score ≥3 at screening and baseline.
  • Body Surface Area (BSA) of AD involvement ≥10% at screening and baseline.
  • Atopic Dermatitis Symptom Diary (ADSD) Worst Itch score (weekly average) ≥4 at baseline.
  • A woman of childbearing potential must use a highly effective form of birth control throughout the trial and for at least 18 weeks after last administration of IMP.

Who cannot join

  • Major surgery within 8 weeks prior to screening, or planned inpatient surgery or hospitalization during the trial period.
  • Active dermatologic condition that could confound the diagnosis of AD or interfere with assessment of the treatment (e.g. scabies, contact dermatitis, rosacea, urticaria, or psoriasis).
  • History of cancer, with the following exceptions:
  • Subjects who have had basal cell carcinoma, localized squamous cell carcinoma of the skin or in situ carcinoma of the cervix are eligible provided that the subject is in remission and curative therapy was completed at least 12 months prior to screening.
  • Subjects who have had other malignancies are eligible provided that the subject is in remission and curative therapy was completed at least 5 years prior to screening
  • History of or current immunodeficiency syndrome.
Show all 40Show fewer
  • History of anaphylaxis following any biologic therapy.
  • History of clinically significant infection within 4 weeks prior to baseline which, in the opinion of the investigator, may compromise the safety of the subject in the trial, interfere with evaluation of the IMP, or reduce the subject's ability to participate in the trial.
  • Skin infection within 7 days prior to baseline
  • Positive HBsAg or positive anti-HCV AND positive HCV RNA at screening.
  • History of HIV infection or positive HIV serology at screening.
  • Evidence of active or latent tuberculosis according to local standard of care for patients requiring initiation of a biologic treatment.
  • ALT or AST level ≥2.0 times the ULN at screening.
  • History of attempted suicide or is at significant risk of suicide (either in the opinion of the investigator or defined as a "yes" to suicidal ideation questions no. 4 or 5 or answering "yes" to suicidal behavior on the C-SSRS Screening version).
  • Known or suspected hypersensitivity to any component(s) of the IMP.
  • Any disorder at screening and/or baseline, which is not stable in the opinion of the investigator, and could:
  • Affect the safety of the subject throughout the trial.
  • Influence the results of the trial.
  • Impede the subject's ability to complete the trial.
  • Any significant abnormal finding at screening and/or baseline which may, in the opinion of the investigator:
  • Put the subject at risk because of their participation in the trial.
  • Influence the results of the trial.
  • Influence the subject's ability to complete the trial.
  • Current or recent chronic alcohol or drug abuse, or any other condition associated with poor compliance as judged by the investigator.
  • Women who are pregnant or breastfeeding.
  • Previous treatment with LEO 138559.
  • Previous exposure to fezakinumab (anti-IL-22 Ab).
  • Systemic treatment with immunosuppressive drugs, immunomodulating drugs, retinoids, corticosteroids (steroid eyedrops and inhaled or intranasal steroids are allowed), or JAK inhibitors within 28 days or 5 half-lives prior to baseline, whichever is longer.
  • Use of tanning beds or phototherapy, within 4 weeks prior to baseline.
  • Receipt of blood products within 28 days prior to screening.
  • Treatment with:
  • Any marketed or investigational biologic agents within 3 months or 5 half-lives, whichever is longer, prior to baseline.
  • Any cell-depleting agents including but not limited to rituximab: within 6 months prior to baseline, or until lymphocyte count returns to normal, whichever is longer.
  • Treatment with TCS, TCI, topical PDE-4 inhibitors, topical JAK inhibitors, or other medicated topical treatments within 7 days prior to baseline.
  • Receipt of live attenuated vaccines 30 days prior to baseline.
  • Treatment with any non-marketed drug substance (that is, an agent which has not yet been made available for clinical use following registration) within the last 4 weeks or 5 half lives prior to randomization, whichever is longer.
  • Current participation in any other interventional clinical trial.
  • Previously randomized in this clinical trial.
  • Employees of the trial site, or any other individuals directly involved with the planning or conduct of the trial, or immediate family members of such individuals.
  • Subjects who are legally institutionalized.

Trial locations and contacts

73 sites in 11 countries.

73 sites in 11 countries

United States12 sites
  • LEO Investigational Site

    Ann Arbor, Michigan, 48103

  • LEO Investigational Site

    Cincinnati, Ohio, 45219

  • LEO Investigational Site

    Fountain Valley, California, 92708

  • LEO Investigational Site

    Hialeah, Florida, 33012

  • LEO investigational site

    Indianapolis, Indiana, 46250

  • LEO Investigational Site

    Los Angeles, California, 90045

  • LEO Investigational Site

    Mayfield Heights, Ohio, 44124

  • LEO investigational Site

    New Albany, Indiana, 47150

  • LEO Investigational Site

    New York, New York, 10029

  • LEO Investigational Site

    North Charleston, South Carolina, 29420

  • LEO Investigational Site

    Raleigh, North Carolina, 27609

  • LEO Investigational Site

    San Francisco, California, 94115

Other trials in United States

Germany11 sites
  • LEO Investigational Site

    Augsburg, 86179

  • LEO Investigational Site

    Bad Bentheim, 48455

  • LEO Investigational Site

    Berlin, 10117

  • LEO Investigational Site

    Dresden, 01307

  • LEO Investigational Site

    Frankfurt am Main, 60590

  • LEO Investigational Site

    Freiburg im Breisgau, 79104

  • LEO Investigational Site

    Gera, 07548

  • LEO Investigational Site

    Kiel, 24105

  • LEO Investigational Site

    Leipzig, 04103

  • LEO Investigational Site

    Mahlow, 15831

  • LEO Investigational Site

    Münster, 48149

Other trials in Germany

Canada8 sites
  • LEO Investigational Site

    Calgary, Alberta, T2J 7E1

  • LEO Investigational Site

    Calgary, Alberta, T2W 4X9

  • LEO Investigational Site

    Edmonton, Albana, T5J 3S9

  • LEO Investigational Site

    Edmonton, Alberta, T6G 1C3

  • LEO Investigational Site

    Mississauga, Ontario, L4Y 4C5

  • LEO Investigational Site

    Sherbrooke, Quebec, J1G 1X9

  • LEO Investigational Site

    Surrey, British Columbia, V3R 6A7

  • LEO Investigational Site

    Verdun, Quebec, H4G 3E7

Other trials in Canada

Japan8 sites
  • LEO Investigational Site

    Fukuoka, Fukuoka, 815-8588

  • LEO Investigational Site

    Kobe, Hyōgo, 657-0846

  • LEO Investigational Site

    Koto-ku, Tokyo, 136-0074

  • LEO Investigational Site

    Takaoka-shi, Toyama, 933-0871

  • LEO Investigational Site

    Takatsuki-shi, Osaka, 569-0824

  • LEO Investigational Site

    Tokyo, 167-0051

  • LEO Investigational Site

    Yokohama, Kanagawa, 220-6208

  • LEO Investigational Site

    Yokohama, Kanagawa, 231-0801

Other trials in Japan

Spain7 sites
  • LEO Investigational Site

    Alcobendas, 5-28100

  • LEO Investigational Site

    Alicante, 03010

  • LEO Investigational Site

    Badalona, Barcelona, 08915

  • LEO Investigational Site

    Barcelona, 08907

  • LEO Investigational Site

    Córdoba, 14004

  • LEO Investigational Site

    Madrid, 28046

  • LEO Investigational Site

    Zaragoza, 50009

Other trials in Spain

Poland6 sites
  • LEO Investigational Site

    Krakow, 30-033

  • LEO Investigational Site

    Krakow, 31-011

  • LEO Investigational Site

    Malbork, 82-200

  • LEO Investigational Site

    Mikołów, 43-190

  • LEO Investigational Site

    Wroclaw, Lower Silesian Voivodeship, 50-450

  • LEO Investigational Site

    Wroclaw, 50-224

Other trials in Poland

United Kingdom6 sites
  • LEO Investigational Site

    Edinburgh, EH16 4SA

  • LEO Investigational Site

    Harrow, HA1 3UJ

  • LEO Investigational Site

    London, E1 1FR

  • LEO Investigational Site

    Manchester, M23 9QZ

  • LEO Investigational Site

    Southampton, SO16 6YD

  • LEO Investigational Site

    Walsall, WS2 9PS

Other trials in United Kingdom

France5 sites
  • LEO Investigational Site

    Dijon, 21000

  • LEO Investigational Site

    Martigues, Bouches-du-Rhône, 13500

  • LEO Investigational Site

    Nice, 06000

  • LEO Investigational Site

    Paris, 75010

  • LEO Investigational Site

    Rouen, 76031

Other trials in France

Czechia4 sites
  • LEO Investigational Site

    Náchod, 547 01

  • LEO Investigatonal Site

    Ostrava-Poruba, 708 52

  • LEO Investigational Site

    Prague, 100 34

  • LEO Investigational Site

    Prague, 150 00

Other trials in Czechia

Hungary3 sites
  • LEO Investigational Site

    Debrecen, 4032

  • LEO Investigational Site

    Pécs, 7632

  • LEO Investigational Site

    Szeged, 6720

Other trials in Hungary

Romania3 sites
  • LEO Investigational Site

    Cluj-Napoca, 400152

  • LEO Investigational Site

    Iași, 700291

  • LEO Investigational Site

    Timișoara, 300757

Other trials in Romania

About this study

Official title: A Phase 2b, Randomized, Double-blind, Placebo-controlled, Multi-site, Parallel-group, Dose-finding Trial to Evaluate the Efficacy and Safety of Different Doses of Subcutaneously Administered LEO 138559 in Adult Subjects With Moderate-to-severe Atopic Dermatitis

The purpose of this trial is to test different doses of the trial medicine (LEO 138559) and see how well they work and how safe they are at treating moderate to severe atopic dermatitis in adults. There will be 4 different doses, that will also be compared to a placebo (a dummy medicine that doesn't contain the active ingredient of LEO 138559). Each participant will be randomly assigned to one of the 4 doses of LEO 138559 or placebo. In all arms, injections of placebo may be used to mask the different doses.

The trial will last up to 36 weeks, including a screening/washout period (up to 4 weeks), a treatment period (16 weeks), and a follow up period (16 weeks). The participants will visit the clinic 17 times. For the first 4 weeks of the treatment period, participants will visit the clinic every week. For the next 12 weeks of the treatment period, participants will visit the clinic every 2 weeks. For the 16 week follow up period, participants will visit the clinic every 4 weeks.

Read more

The treatments will be given to the participants by staff at the clinic. They are given as an injection just under the skin.

At each visit the doctor will check the participants atopic dermatitis and if they have had any side effects. Participants will also complete an electronic diary every day about their atopic dermatitis and quality of life.

LEO 138559 is also called "Temtokibart".

Being tested
LEO 138559, Placebo
Medical subject headings
Dermatitis, Atopic

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • LEO 138559Drug

    Also called LEO 138559 is also called "temtokibart"

    LEO 138559 given by injection just under the skin

  • PlaceboDrug

    Placebo given by injection just under the skin

Study groups in NCT05923099
Study groupRoleWhat they receive
Dose regimen 1ExperimentalDose A every week from Week 0 to Week 3, then every 2 weeks from Week 4 to Week 16
Receives: Drug: LEO 138559
Dose regimen 2ExperimentalDose B every week from Week 0 to Week 2, then every 2 weeks from Week 4 to Week 16
Receives: Drug: LEO 138559
Dose regimen 3ExperimentalDose A at Week 0 and Week 2, then dose C every 2 weeks from Week 4 to Week 16
Receives: Drug: LEO 138559
Dose regimen 4ExperimentalDose C at Week 0 and Week 2, then dose D every 2 weeks from Week 4 to Week 16
Receives: Drug: LEO 138559
Placebo regimenPlacebo comparatorPlacebo every week from Week 0 to Week 3, then every 2 weeks from Week 4 to Week 16
Receives: Drug: Placebo

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Percent Change in Eczema Area and Severity Index (EASI) Score

    The EASI is a validated measure used in clinical practice and clinical trials to assess the severity and extent of atopic dermatitis. The EASI is a composite index with scores ranging from 0 to 72, with higher values indicating more severe, and/or more extensive condition.

    Measured: From baseline to Week 16

Secondary outcomes (1)
  1. Number of Treatment-emergent Adverse Events (TEAEs)

    An event will be considered treatment emergent if started after the first dose of IMP or if started before the first dose of IMP and worsened in severity after first dose of IMP.

    Measured: From baseline (Week 0) to Week 16

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted28 Jun 2023
  2. Study start20 Sep 2023
  3. Primary completion11 Dec 2024
  4. Study completion9 Apr 2025

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
Double blind
Who is masked
Participant, Investigator
Enrolment
262 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05923099
Sponsor's protocol ID
LP0145-2240
Other IDs
U1111-1286-0955, 2022-500777-14-00
Status last verified
Dec 2025
First submitted
20 Jun 2023
Last updated
12 Feb 2026
Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing LEO 138559 in people with Atopic Dermatitis, run by LEO Pharma at 73 sites in 11 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 11 inclusion and 40 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 12 Feb 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 73 sites in United States, Germany, Canada, Japan, Spain and 6 more countries. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 12 Feb 2026). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Percent Change in Eczema Area and Severity Index (EASI) Score (time frame: From baseline to Week 16). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 12 Feb 2026.

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