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89Zr˗DFO˗REGN5054

Phase 1

Advanced Solid Tumor | Small molecule | Oncology |Regeneron Pharmaceuticals, Inc.|Trials Updated: Sep 21, 2026

Development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Feb 2022

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment50

FDA Designations

No designations recorded

Clinical trial landscape

89Zr˗DFO˗REGN5054 · 1 trial · 2 indications

Phase 1 1
NCT05259709A Study of ImmunoPet Imaging Using 89Zr-DFO-REGN5054 in Adult Participants With Solid Cancers Treated With CemiplimabAdvanced Solid Tumor
RECRUITING50 Analytics
PHASE1RECRUITING
A Study of ImmunoPet Imaging Using 89Zr-DFO-REGN5054 in Adult Participants With Solid Cancers Treated With Cemiplimab
Advanced Solid TumorUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence and severity of treatment-emergent adverse events (TEAEs)
Up to day 8, after the infusion of 89Zr˗DFO˗REGN5054

Part A

Incidence and severity of TEAEs
Up to approximately week 115

Part A and B

Secondary Endpoints

Clinical dosimetry based on tissue radiation absorbed dose calculated from positron emission tomography (PET) image acquisition data
On days 1, 5 and 8
Clinical dosimetry based on tissue radiation effective dose calculated from PET image acquisition data
On days 1, 5 and 8
Concentration of 89Zr-DFO-REGN5054 in serum
On days 1, 5 and 8
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Single ascending dose of 89Zr˗DFO˗REGN5054 followed by fixed dose of cemiplimabEXPERIMENTALPart A: Doses of 89Zr˗DFO˗REGN5054 may be reduced based upon assessment.
Defined dose of 89Zr˗DFO˗REGN5054 followed by fixed dose of cemiplimabEXPERIMENTALPart B: Defined dose of 89Zr˗DFO˗REGN5054 determined in Part A.

Interventions

NameTypeDescription
89Zr˗DFO˗REGN5054DRUGAdministered by intravenous (IV) infusion during Part A and B.
cemiplimabDRUGAdministered by IV infusion every 3 weeks (Q3W).
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites1

Key Inclusion Criteria: * Advanced or metastatic solid tumors that may respond to anti-programmed cell death 1 (PD-1) immunotherapy * Measurable disease according to Response Evaluation Criteria in Solid Tumours (RECIST) 1.1 criteria * Eastern Cooperative Oncology Group (ECOG) performance status of...

Countries:Netherlands
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Competitive Landscape -Other Solid Tumors 9 trials (matched to "Advanced Solid Tumor")

Recent Changes (Last 90 Days)

MEDIUMSep 21, 2026NCT05259709primaryCompletionDate: changed
MEDIUMSep 21, 2026NCT05259709primaryCompletionDate: changed

Frequently asked questions about 89Zr˗DFO˗REGN5054

What is 89Zr-DFO-REGN5054?

89Zr-DFO-REGN5054 is an investigational imaging agent developed by Regeneron Pharmaceuticals, Inc. (ticker: REGN). It is being studied in a Phase 1 trial for ImmunoPet imaging in adult participants with advanced or metastatic solid tumors who are being treated with cemiplimab. It is not a therapeutic drug; it is used to visualize targets in the body.

What is 89Zr-DFO-REGN5054 used for in advanced solid tumor?

89Zr-DFO-REGN5054 is used for ImmunoPet imaging in adult participants with advanced or metastatic solid tumors who are receiving cemiplimab. The Phase 1 study is evaluating its use as an imaging agent, not as a treatment. It is designed to help visualize specific targets in tumors.

Who makes 89Zr-DFO-REGN5054?

89Zr-DFO-REGN5054 is being developed by Regeneron Pharmaceuticals, Inc., which trades under the ticker REGN. Regeneron is the sponsor of the Phase 1 trial evaluating this imaging agent in patients with solid cancers treated with cemiplimab.

What phase is 89Zr-DFO-REGN5054 in?

89Zr-DFO-REGN5054 is in Phase 1 clinical development. The only trial is a Phase 1 study that is currently recruiting participants. It is an investigational agent and has not been approved by the FDA for any indication.

What clinical trials is 89Zr-DFO-REGN5054 in?

89Zr-DFO-REGN5054 is being studied in one clinical trial: NCT05259709, titled "A Study of ImmunoPet Imaging Using 89Zr-DFO-REGN5054 in Adult Participants With Solid Cancers Treated With Cemiplimab." This Phase 1 trial is recruiting up to 50 participants in the Netherlands.

Is 89Zr-DFO-REGN5054 FDA approved?

No, 89Zr-DFO-REGN5054 is not FDA approved. It is an investigational imaging agent in Phase 1 clinical development. The ongoing trial, NCT05259709, is evaluating its use in adult participants with advanced or metastatic solid tumors who are being treated with cemiplimab.