A multi-part, adaptive, Phase 1, first time in human study in healthy participants and participants with atopic dermatitis (AD) to assess the safety, tolerability, pharmacokinetics (PK) of single ascending (SAD), multiple ascending doses (MAD) and selected dose of SYX-5219 (AD Participants)

2025-522216-17-00 Protocol SYX-5219-101 Human pharmacology (Phase I) - First administration to humans Ongoing, recruiting

Start 26 Jan 2026 · Status Ongoing, recruiting · 4 EU/EEA countries · 8 sites · Protocol SYX-5219-101

Overview

Sponsor-declared trial summary

Phase Human pharmacology (Phase I) - First administration to humans
Status Ongoing, recruiting
Participants planned 50
Countries 4
Sites 8

Atopic Dermatitis

Key facts

Sponsor
Sitryx Therapeutics Limited
Participant type
Patients
Age range
18-64 years
Gender
Male and Female
Therapeutic area
Diseases [C] - Skin and Connective Tissue Diseases [C17]
Trial duration
26 Jan 2026 → ongoing
Decision date (initial)
2025-10-21
Transition trial
No
Low-intervention
No
Rare-disease indication
No
Vulnerable population
Yes

Trial design

CTIS Part I — objectives, methods, condition coding

Conditions and MedDRA coding

Atopic Dermatitis

VersionLevelCodeTermSystem organ class
20.0 PT 10012438 Dermatitis atopic 100000004858

Sponsors and contacts

Sponsor organisations, regulatory contacts, third parties

Sitryx Therapeutics Limited

Sponsor organisation
Sitryx Therapeutics Limited
Address
101 Bellhouse Building, Magdalen Centre, The Oxford Science Park Magdalen Centre The Oxford Science Park
City
Oxford
Postcode
OX4 4GA
Country
United Kingdom

Scientific contact point

Organisation
Sitryx Therapeutics Limited
Contact name
Sitryx Clinical Operations

Public contact point

Organisation
Sitryx Therapeutics Limited
Contact name
Sitryx Clinical Operations

Locations

4 EU/EEA countries · 8 investigational sites

By country

CountryMS statusPlanned subjectsSites
Bulgaria Ongoing, recruiting 15 2
Denmark Ongoing, recruiting 5 1
Germany Ongoing, recruiting 6 4
Ireland Ongoing, recruiting 2 1
Rest of world
United Kingdom, United States
22

Investigational sites

Bulgaria

2 sites · Ongoing, recruiting
Medical Center Comac Medical Ltd.
Skin and Venereal Diseases, Ulitsa Sveti Georgi Sofiyski 3, 1606, Sofia
Medical Center Comac Medical Ltd.
Skin and Venereal Diseases, Ulitsa Urvich 13, Krasno Selo District, Sofia

Denmark

1 site · Ongoing, recruiting
Sanos A/S
Dermatology, Herlev Hovedgade 82, 2730, Herlev

Germany

4 sites · Ongoing, recruiting
Charite Universitaetsmedizin Berlin KöR
Outpatient Clinic Allergology and Immunology, Chariteplatz 1, Mitte, Berlin
University Medical Center Hamburg-Eppendorf
Dermatology, Martinistrasse 52, Eppendorf, Hamburg
Medical Center - University Of Freiburg
Dermatology, Stefan-Meier-Strasse 26, Neuburg, Freiburg Im Breisgau
Goethe University Frankfurt
Dermatology, Theodor-Stern-Kai 7, 60590, Frankfurt Am Main

Ireland

1 site · Ongoing, recruiting
St James's Hospital
Dermatology, James's Street, D08 NHY1, Dublin 8

Country notifications

Trial-start, recruitment-start, end and early-termination notifications submitted per Member State

Country Trial startTrial end Recruitment startRecruitment end Early termination
Bulgaria 2026-01-26 2026-01-26
Denmark 2026-05-20 2026-05-20
Germany 2026-02-11 2026-02-11
Ireland 2026-02-16 2026-02-16

Application history

8 submissions — initial application plus substantial / non-substantial modifications

#TypeCodeSubmittedReference MSConclusionDecision date
1 INITIAL IN 2025-07-07 Germany Acceptable
2025-10-07
2025-10-09
2 SUBSTANTIAL MODIFICATION SM-1 2025-10-31 Germany Acceptable
2025-12-23
2025-12-23
3 SUBSEQUENT ADDITION OF MSC APP-3 2026-01-21 Acceptable
2025-12-23
2026-04-13
4 SUBSTANTIAL MODIFICATION SM-2 2026-02-10 Acceptable 2026-04-27
5 SUBSTANTIAL MODIFICATION SM-3 2026-02-10 Acceptable 2026-03-06
6 SUBSTANTIAL MODIFICATION SM-4 2026-02-10 Germany Acceptable 2026-03-24
7 NON SUBSTANTIAL MODIFICATION NSM-1 2026-04-27 Acceptable 2026-04-27
8 NON SUBSTANTIAL MODIFICATION NSM-2 2026-04-28 Germany Acceptable 2026-04-28