A Study to Evaluate Safety and Clinical Activity of GSK5926371 in Adult Participants With Relapsed or Refractory B-NHL

June 17, 2026 updated by: GlaxoSmithKline

A Phase 1/2 Open-label, Multi-center Study to Evaluate the Safety and Clinical Activity of GSK5926371 in Adult Participants With Relapsed or Refractory B-cell Non-Hodgkin Lymphoma (B-NHL)

The goal of this clinical trial is to learn if drug GSK5926371 works to treat a form of B-cell cancer (a type of blood cancer) that has returned or failed to respond to prior therapies in adults. The study will primarily assess the drugs safety and tolerability in participants. Additionally, it seeks to determine the clinical efficacy and pharmacokinetic (PK) properties of GSK5926371.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

49

Phase

  • Phase 2
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

Study Locations

  • Canada
    • Ontario
      • Toronto, Ontario, Canada, M5G 1X6
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • John Kuruvilla
  • Japan
      • Tokyo, Japan, 135-8550
        • GSK Investigational Site
        • Principal Investigator:
          • Dai Maruyama
        • Contact:
        • Contact:
  • United States
    • Ohio
      • Canton, Ohio, United States, 44718
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Nashat Gabrail

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Has histologically confirmed Relapsed/Refractory (R/R) B-NHL, for which systemic treatment is indicated,

    1. Has measurable disease,
    2. Has received at least 2 prior lines of systemic anti-neoplastic therapy, including an anti-CD20-containing combination appropriate for the indication;
    3. Has documented disease relapse, progression or disease refractory to the most recent line of therapy, per Lugano criteria.:
  • Willing to use adequate contraception (Participant of childbearing potential [POCBP] only).
  • Is capable of giving signed informed consent
  • Has an Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 2.
  • Has adequate organ function.

Exclusion Criteria:

  • Has a malignancy (except disease under study) that has progressed or required active treatment within the past 24 months except for basal cell or squamous cell carcinomas of the skin or in-situ carcinomas (e.g., breast, cervix, bladder) that have been resected with no evidence of metastatic disease.
  • Has had any major surgery within 4 weeks prior to the first dose of GSK5926371 or has not recovered from prior surgeries or complications.
  • Has a history of Progressive multifocal leukoencephalopathy (PML), current central nervous system (CNS) involvement by lymphoma, or a history of significant CNS disease such as uncontrolled seizures, stroke, epilepsy, CNS vasculitis, and neurodegenerative conditions.
  • Has an active uncontrolled infection.
  • Has received a prior Allogeneic stem cell transplant (allo-SCT) within 12 months prior to the first dose of GSK5926371 or has active graft-versus-host disease requiring systemic immunosuppressive therapy.
  • Has received a prior autologous stem cell transplant within 100 days prior to the first dose of GSK5926371.
  • Has received prior treatment with Chimeric antigen receptor T-cell (CAR-T) therapy within 12 weeks of first GSK5926371 administration.
  • Has received prior treatment with CD19- or CD20-targeting Bispecific antibody (BsAbs) within 8 weeks of the first dose of study intervention.
  • Has QT interval corrected (QTc) >450 milliseconds (msec) or QTc >480 msec for participants with bundle branch block.
  • Has significant cardiovascular disease such as uncontrolled arrhythmias, Class 3 or 4 congestive heart failure as defined by the New York Heart Association Functional Classification, ejection fraction <=45% by any methods in the 12 months of enrollment, unstable angina or acute coronary syndrome including myocardial infarction within 6 months of enrollment.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Sequential Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: GSK5926371
Drug: GSK5926371
GSK5926371 will be administered at different dose levels.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Number of participants with dose limiting toxicities (DLTs)
Time Frame: Up to 28 days
Up to 28 days
Number of participants with adverse events (AEs) or Serious adverse events (SAEs) by severity
Time Frame: Up to approximately 169 weeks
Up to approximately 169 weeks

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Number of participants with clinically meaningful changes in laboratory parameters, vital signs, and electrocardiogram (ECG)
Time Frame: Up to approximately 169 weeks
Up to approximately 169 weeks
Overall Response Rate (ORR)
Time Frame: Up to approximately 169 weeks
ORR is defined as the percentage of participants in the ORR evaluable set with the best overall response of confirmed partial response (PR) or better per Lugano guidelines as assessed by investigator.
Up to approximately 169 weeks
Maximum concentration (Cmax) of GSK5926371
Time Frame: Up to approximately 169 weeks
Up to approximately 169 weeks
Time to Cmax (Tmax) of GSK5926371
Time Frame: Up to approximately 169 weeks
Up to approximately 169 weeks
Area under the curve (AUC) of GSK5926371
Time Frame: Up to approximately 169 weeks
Up to approximately 169 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

GlaxoSmithKline

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

June 12, 2026

Primary Completion (Estimated)

September 24, 2029

Study Completion (Estimated)

September 24, 2029

Study Registration Dates

First Submitted

May 19, 2026

First Submitted That Met QC Criteria

May 19, 2026

First Posted (Actual)

May 27, 2026

Study Record Updates

Last Update Posted (Actual)

June 18, 2026

Last Update Submitted That Met QC Criteria

June 17, 2026

Last Verified

June 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 300557
  • 2025-524915-36 (Other Identifier: EU CT Number)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

Study Sponsor will assess requests from qualified researchers for anonymized individual patient-level data and related study documents. Data sharing is subject to certain criteria, conditions, and exceptions. For further information, refer to https://www.gsk-studyregister.com/gsk-patient-level-data-sharing-july2025.pdf

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Clinical Trials on Lymphoma, Non-Hodgkin

Clinical Trials on GSK5926371

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

CROs by country

CROs in Ireland

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

Subscribe