A study to investigate the safety, tolerability, pharmacokinetics, immunogenicity and pharmacodynamics of a single subcutaneous dose of GSK4771261 in healthy participants aged 25 to 55 years of age inclusive

2025-525073-37-00 Protocol 221377 Human pharmacology (Phase I) - Other Temporarily halted

Start 12 May 2026 · Status Temporarily halted · 1 EU/EEA countries · 1 sites · Protocol 221377

Overview

Sponsor-declared trial summary

Phase Human pharmacology (Phase I) - Other
Status Temporarily halted
Participants planned 30
Countries 1
Sites 1

Autosomal Dominant Polycystic Kidney Disease

Key facts

Sponsor
Glaxosmithkline Research & Development Limited
Participant type
Healthy volunteers
Age range
18-64 years
Gender
Male and Female
Therapeutic area
Diseases [C] - Congenital, Hereditary, and Neonatal Diseases and Abnormalities [C16]
Trial duration
12 May 2026 → ongoing
Decision date (initial)
2026-05-06
Transition trial
No
Low-intervention
No
Rare-disease indication
Yes
Vulnerable population
No

Trial design

CTIS Part I — objectives, methods, condition coding

Conditions and MedDRA coding

Autosomal Dominant Polycystic Kidney Disease

VersionLevelCodeTermSystem organ class
20.0 LLT 10036046 Polycystic kidney autosomal dominant 10010331

Sponsors and contacts

Sponsor organisations, regulatory contacts, third parties

Glaxosmithkline Research & Development Limited

Sponsor organisation
Glaxosmithkline Research & Development Limited
Address
79 New Oxford Street
City
London
Postcode
WC1A 1DG
Country
United Kingdom

Scientific contact point

Organisation
Glaxosmithkline Research & Development Limited
Contact name
EU GSK Clinical Trials Call Center

Public contact point

Organisation
Glaxosmithkline Research & Development Limited
Contact name
EU GSK Clinical Trials Call Center

Locations

1 EU/EEA country · 1 investigational sites

By country

CountryMS statusPlanned subjectsSites
Netherlands Temporarily halted 30 1
Rest of world 0

Investigational sites

Netherlands

1 site · Temporarily halted
Pharmaceutical Research Associates Group B.V.
Program Management, Van Swietenlaan 6, 9728 NZ, Groningen

Country notifications

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

Country Trial startTrial end Recruitment startRecruitment end Early termination
Netherlands 2026-05-12 2026-05-18 2026-06-19

Oversight and notifications

Regulatory notifications under CTR Articles 38, 52, 53, 54 and 77

Temporary halts 1 · Art. 38 CTR

Temporary halt TH-141802

Halt date
2026-06-19
Member states concerned
Netherlands
Publication date
2026-07-03
Reason
Safety related (clinical or pre-clinical results)
Explanation
To review the cumulative safety database. To update the IB, protocol and ICF to include a new potential risk of elevated transaminases in blinded data.
Follow-up measures
Screening, randomisation and dosing of participants has been halted. Ongoing monitoring of participants who have been dosed in this single dose study is continuing, as per protocol. The updated IB, protocol, and ICF will be submitted to the relevant authorities as a substantial amendment, in accordance with local requirements.
Benefit-risk balance changed
Yes
Treatment stopped
Yes

Application history

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

#TypeCodeSubmittedReference MSConclusionDecision date
1 INITIAL IN 2026-03-13 Netherlands Acceptable
2026-05-06
2026-05-06