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Completed Phase 1 Interventional

NKTR-255 in Combination With CAR-T Cell Therapy for the Treatment of Relapsed or Refractory Large B-cell Lymphoma

ClinicalTrials.gov ID: NCT05359211

Public ClinicalTrials.gov record NCT05359211. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.

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ClinicalTrials.gov public records Last synced Oct 21, 2026, 1:10 AM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Official title

A Phase Ib Open-Label Study Evaluating the Safety and Efficacy of NKTR-255 in Combination With CD19-Directed CAR-T Cell Therapy in Patients With Relapsed/Refractory (R/R) Large B-Cell Lymphoma (LBCL)

Brief summary

Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.

This phase Ib trial studies the effects of NKTR-255 in combination with chimeric antigen (CAR)-T cell therapy and to see how well they work in treating patients with large B-cell lymphoma that has come back (relapsed) or does not respond to treatment (refractory). NKTR-255 is an investigational IL-15 receptor agonist designed to boost the immune system's natural ability to fight cancer. T cells are infection fighting blood cells that can kill tumor cells. Lisocabtagene maraleucel is a CAR-T cell product that consists of genetically engineered T cells, modified to recognize CD19, a protein on the surface of cancer cells. These CD19-specific T cells may help the body's immune system identify and kill CD19-positive cancer cells. Giving NKTR-255 together with lisocabtagene maraleucel may work better in treating large B-cell lymphoma than either drug alone.

Study identification

NCT ID
NCT05359211
Recruitment status
Completed
Study type
Interventional
Phase
Phase 1
Enrollment
27 participants

Conditions and interventions

Eligibility (public fields only)

Age range
18 Years and older
Sex
All
Healthy volunteers
Healthy volunteers not accepted

This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.

Study timeline

Start date
Dec 8, 2022 (Actual)
Primary completion
Sep 4, 2025 (Actual)
Completion
Sep 4, 2026 (Actual)
Last update posted
Sep 21, 2026

2022 – 2026

United States locations

U.S. sites
1
U.S. states
1
U.S. cities
1
Facility City State ZIP Site status
Fred Hutch/University of Washington Cancer Consortium Seattle Washington 98109 —

Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.

About this trial record page

What this page shows
Public field values for ClinicalTrials.gov record NCT05359211, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
What this page does not do
No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
Where the data comes from
Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
Last refresh
Last update posted Sep 21, 2026 · Synced Oct 21, 2026

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Open the official record

The complete public registry record, listed eligibility criteria, and available contact information for NCT05359211 live on ClinicalTrials.gov.

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