Safety, Tolerability, and Preliminary Efficacy of Soquelitinib in Adults with Moderate to Severe Atopic Dermatitis (Phase 2 Study)

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What is this study about?

The study focuses on Atopic dermatitis (AD), a chronic skin condition that causes itchy, red, and inflamed patches. The investigational medication being evaluated is Soquelitinib, an oral tablet taken by mouth, and it will be compared with placebo tablets that contain no active drug. The aim of the trial is to determine whether different dosing amounts of Soquelitinib improve the signs and symptoms of AD compared with placebo.

Participants will be randomly assigned to receive either a low dose once daily, a low dose twice daily, a higher dose once daily, or placebo for about three months. Throughout the study, researchers will monitor changes in the severity of the rash using the EASI score, a measure that rates the extent and intensity of eczema. They will also assess overall skin improvement with a global rating called vIGA, track itch intensity using a numeric scale known as PP-NRS, and evaluate the impact on daily life through quality‑of‑life questionnaires such as the DLQI and POEM. Safety will be checked by recording any side effects that occur during the treatment period.

1 randomization and treatment assignment

after enrollment you will be randomly assigned to receive either soquelitinib tablets or matching placebo tablets. the possible soquelitinib regimens are 200 mg taken once daily, 200 mg taken twice daily, or 400 mg taken once daily. the tablets are identical in appearance, so you will not know which you receive.

2 baseline assessments

before starting the medication, a series of measurements will be taken to record the current severity of your atopic dermatitis. these include the earl skin severity index (easi) score, the percentage of body surface area affected, a patient‑reported itch score (pp‑nrs), a quality‑of‑life questionnaire (dlqi), and a symptom diary (poem). the results serve as a reference point for later comparisons.

3 initiation of study medication

you will begin taking the assigned tablets orally each day for a total of 12 weeks. if assigned to the 400 mg once‑daily regimen, you will take one tablet each morning. if assigned to the 200 mg once‑daily regimen, you will take one tablet each morning. if assigned to the 200 mg twice‑daily regimen, you will take one tablet in the morning and one tablet in the evening. the placebo group follows the same schedule with matching tablets.

4 regular clinic visits

clinic visits are scheduled at week 4, week 8, and week 12 after starting the medication. during each visit, the same assessments performed at baseline (easi, affected body surface area, pp‑nrs, dlqi, poem) will be repeated to track changes. vital signs and basic laboratory tests may also be checked to monitor safety.

5 monitoring for side effects

throughout the 12‑week treatment period you are asked to report any new symptoms, discomfort, or health problems to the study staff. these are recorded as treatment‑emergent adverse events and are evaluated for severity and relationship to the study medication.

6 end of treatment assessment

at week 12 you will undergo a final set of assessments identical to those performed at baseline and the earlier visits. the primary goal is to determine the percent change in easi score from baseline. secondary goals include the proportion of participants achieving a 75 % reduction in easi, improvement in investigator‑global assessment, reduction in itch score, and changes in quality‑of‑life measures.

7 study completion and follow‑up

after the final visit, the study medication is discontinued. you may be asked to attend a short follow‑up contact to record any late‑appearing side effects, but no further study medication will be taken.

Who Can Join the Study?

You must be an adult (at least 18 years old).
You must have a diagnosis of atopic dermatitis (AD) confirmed by a doctor using a standard set of signs called the Hanifin and Rajka criteria, and your symptoms must have started at least one year before the screening visit.
Your eczema must be moderate to severe, which means a score of 16 or higher on the Eczema Area and Severity Index (EASI), involvement of 10% or more of your body surface area (BSA), and a rating of 3 or higher on the Investigator Global Assessment (vIGA) at screening and on Day 1.
A second, independent doctor must review full‑body photographs taken at screening and agree that your eczema severity meets the moderate‑to‑severe criteria.
Your average itch rating over the seven days before randomization must be 4 or higher on the Patient‑Reported Pruritus Numerical Rating Scale (PP‑NRS), which rates itch from 0 (no itch) to 10 (worst possible itch).
You must have a documented history of using topical (skin creams or ointments) and/or systemic therapy (medicines taken by mouth or injection) for AD within the six months before randomization.
If you are male, you must agree to use contraception during the study and for at least 120 days after the last dose, and you must not donate sperm during that time.
If you are female, you must not be pregnant or breastfeeding, and you must either be unable to become pregnant or, if you could become pregnant (woman of childbearing potential, WOCBP), agree to use contraception during the study and for at least 120 days after the last dose.

Who Cannot Join the Study?

Cannot join if you have not responded to more than two strong medicines used for severe eczema (such as cyclosporine, methotrexate, azathioprine, mycophenolate mofetil, dupilumab, tralokinumab, lebrikizumab, nemolizumab, abrocitinib, baricitinib, or upadacitinib) according to your medical history or interview.
Cannot join if you are currently using or have a history of other skin problems (like psoriasis, skin lupus, serious burns, or large tattoos) that would make it hard to see how the study drug affects your eczema.
Cannot join if you have any active skin disease or skin infection (bacterial, fungal, or viral) that needed pills or injections within the last 30 days, or that could interfere with evaluating your eczema.
Cannot join if you have a weak immune system, a serious past infection that spread through the body (such as sepsis, severe pneumonia, or bone infection), or any current infection outside the skin that required antibiotics or similar medicines within the last 30 days.
Cannot join if you have a condition that weakens your immune system not caused by medication (for example, common variable hypogammaglobulinemia), or if you have significant health problems like low blood counts (anemia, neutropenia, thrombocytopenia), poor kidney or liver function, planned surgery, or if you are permanently wheelchair‑bound, bedridden, or unable to take care of yourself.
Cannot join if you have an unstable or uncontrolled illness, including serious heart problems (such as unstable chest pain, uncontrolled high blood pressure, or moderate to severe heart failure), lung, stomach, hormone, blood, or nerve disorders that could affect your safety or the study results.
Cannot join if your kidney function is moderately or severely reduced, measured as an estimated glomerular filtration rate (eGFR) of 59 mL/minute or lower.
Cannot join if you have liver disease that does not meet safe limits set by the FDA (no brain confusion from liver disease, no fluid buildup in the abdomen, blood bilirubin ≤2.0 mg/dL, albumin ≥3.5 g/dL, and clotting time not more than 4 seconds longer than normal).
Cannot join if any of the following lab test results are abnormal:
- Hematocrit (percentage of red blood cells) less than 30%.
- Neutrophil count (a type of white blood cell) less than 2,000 per microliter.
- Liver enzymes (ALT, AST, ALP, GGT) at least twice the normal upper limit.
- Platelet count (cells that help blood clot) less than 100,000 per microliter.
Cannot join if you are currently misusing alcohol or drugs (active substance abuse).

Where you can join this trial?

Verified and Recommended Sites

No sites found in this category

Verified Sites

Site Name	City	Country	Status
Fondazione Policlinico Universitario Agostino Gemelli IRCCS	Rome	Italy
Technische Universitaet Dresden	Dresden	Germany

Other Sites

Site Name	City	Country
Clintrial s.r.o.	Prague	Czechia
Dermoklinika Centrum Medyczne s.c. M. Kierstan, J. Narbutt, A. Lesiak	Lodz	Poland
OT.Co Zdrowie Sp. z o.o.	Warsaw	Poland
Dkc Fokus-5 Lzip OOD	Sofia	Bulgaria
Alwfcaj Szcwpfhga Uzkttjcvypfud Ghdvvkvs Ilkcbytw	Trieste	Italy
Acvqkpd Oydsrbmubgxdchmcwijhudxsh Pptbbxlhfjo Ga Retdxvgxkxyx Mylzk Dg Cyylgse	Catania	Italy
Ppgsuslxib smeupp	Prague	Czechia
Pivqmd Pmwnquwcz ayve	Pardubice	Czechia
Irxxj Odzelxue Prhpccajrrj Spr Moixdhl	Genoa	Italy
Umkrjrhxxiwxhgqtb Ppkpknuihiy Dxuio Mfrxod	Ancona	Italy
Avwelio Ovdealwyzlrttndwpkvtdfvhb Morbervv Dzerl Cugjuk	Novara	Italy
Icrpdz Ivhijthn Fpcnsbpawbnfo Opuehupphud	Rome	Italy
Ugspcrxdjs Dcxqr Snslk Dh Bpdoawa	Brescia	Italy
Cupkezo Unjpvvsygeowhisplxrh Btoedq Koz	Berlin	Germany
Uokuoqkerveolggpfpqca Mlwthcsc Ayp	Munster	Germany
Gjuscf Uwobkdibug Fdeozeqbv	Frankfurt	Germany
Uobqdirlrhatazhphkxku Sshbntakyvkoqxlssi Anj	Kiel	Germany
Ukqufwztndvxtlahnwdqd Afwyyrwh	Augsburg	Germany
Uvbmgbcuixoth Syfrohh Kwmptutgc Insokouvpsbd Ceffnuw W Rojliopnj	Rzeszow	Poland
Chydnthzrt Pomkzwfyqhe Lzbkldlcdyenrysbhljegfz Mdwaivrr scidb	Wroclaw	Poland
Dgmmoxifuo Skc z omxw	Wroclaw	Poland
Kkkblzh Abbrrezog Slf z obwr	Warsaw	Poland
Cocxcni Njmetgztvtnm Tnvrqff Djcji Lyamry Sph z oewd	Cracow	Poland
Lqnya Cvyhdv Scqk dk Taearw Kecprpxzvoo dr Agqgvvc Kqbooyub	Szczecin	Poland
Ujgbvs Mvzfvzg Ctnujn Elkt	Plovdiv	Bulgaria
Mhfyctb Cjztbo Mfqmlzsjcf Pxokif Ott	Pleven	Bulgaria

Trial status

Country	Status	Recruitment Start
Bulgaria	Not yet recruiting	01.09.2026
Czechia	Not yet recruiting	01.09.2026
Germany	Not yet recruiting	01.09.2026
Italy	Not yet recruiting	01.09.2026
Poland	Not yet recruiting	01.09.2026

Trial locations

Soquelitinib is an experimental oral tablet being studied as a possible treatment for moderate to severe atopic dermatitis, a skin condition that causes itchy, inflamed patches. In this trial, participants take the medication by mouth, and researchers are looking at how well it reduces the severity of the eczema, how safe it is, and whether it is tolerated by patients. The study compares different ways of giving the drug to see which schedule might work best, and the results will help determine if Soquelitinib could become a new option for managing this chronic skin disease.

Atopic dermatitis – Atopic dermatitis is a chronic inflammatory skin condition that causes itchy, red, and dry patches. It often begins in childhood but can continue into adulthood. The rash typically appears on the face, elbows, knees, and hands, and may spread to larger areas over time. Flare‑ups can be triggered by allergens, stress, or changes in temperature. The skin may become thickened and leathery with repeated scratching. Symptoms tend to wax and wane, with periods of worsening followed by calmer phases.

Trial ID:

2025-524384-20-00

Protocol code:

CPI-818-006

NCT ID:

NCT07441395

Trial Phase:

Therapeutic exploratory (Phase II)

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Safety, Tolerability, and Preliminary Efficacy of Soquelitinib in Adults with Moderate to Severe Atopic Dermatitis (Phase 2 Study)

What is this study about?

Who Can Join the Study?

Who Cannot Join the Study?