TTI-622 in Combination With Pembrolizumab for the Treatment of Relapsed or Refractory Diffuse Large B-Cell Lymphoma

ClinicalTrials.gov ID: NCT05507541

Public ClinicalTrials.gov record NCT05507541. 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 Sep 2, 2026, 10:43 PM EDT

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

Official title

Phase 2 Study With Safety run-in of PD-1 Inhibitor and IgG4 SIRPα-Fc Fusion Protein (TTI-622) in Relapsed Diffuse Large B-Cell Lymphoma (DLBCL)

Brief summary

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

This phase II trial tests the safety, side effects, and best dose of TTI-621 (closed to enrollment) or TTI-622 in combination with pembrolizumab in treating patients with diffuse large B-cell lymphoma that has come back after a period of improvement (relapsed) or that does not respond to treatment (refractory). TTI-621 and TTI-622 are called fusion proteins. A fusion protein includes two specialized proteins that are joined together. In TTI-621 and TTI-622, one of the proteins binds with other proteins found on the surface of certain cells that are part of the immune system. The other protein targets and blocks a protein called CD47. CD47 is present on cancer cells and is used by those cells to hide from the body's immune system. By blocking CD47, TTI-621 and TTI-622 may help the immune system find and destroy cancer cells. Pembrolizumab is a monoclonal antibody directed against human cell surface receptor PD-1 (programmed death-1 or programmed cell death-1) that works by helping the body\'s immune system attack the cancer and may interfere with the ability of cancer cells to grow and spread. Giving TTI-621 (closed to enrollment) or TTI-622 in combination with pembrolizumab may kill more cancer cells in patients with relapsed or refractory diffuse large B-cell lymphoma.

Study identification

NCT ID: NCT05507541
Recruitment status: Active, not recruiting
Study type: Interventional
Phase: Phase 2
Lead sponsor: Mayo Clinic; Other
Enrollment: 10 participants

Conditions and interventions

Conditions

Interventions

Procedure · Drug · Biological

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: Apr 18, 2023
Primary completion: Jul 29, 2027
Completion: Jul 29, 2027
Last update posted: Apr 21, 2026

2023 – 2027

United States locations

U.S. sites: 2
U.S. states: 2
U.S. cities: 2

Facility	City	State	ZIP	Site status
University of Iowa	Iowa City	Iowa	52242	—
Mayo Clinic	Rochester	Minnesota	55905	—

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 NCT05507541, 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 Apr 21, 2026 · Synced Sep 2, 2026

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The complete protocol, eligibility criteria, and contact information for NCT05507541 live on ClinicalTrials.gov.

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