Study of ImmunoPet Imaging of PD-L1 in Tumors Using 89Zr-DFO-REGN3504 in Adult Participants With Advanced PD-L1 Positive Malignancies

A Phase 1, First-in-Human Study of ImmunoPET Imaging of PD-L1 in Tumors Using 89Zr-DFO-REGN3504, an Anti-PD-L1 Tracer for Positron Emission Tomography in Patients With Advanced PD-L1 Positive Malignancies

The primary objective of the study is to determine the safety and tolerability of 89Zr-DFO-REGN3504.

The secondary objectives of the study are:

Study Part A only:

• To establish adequate mass dose and activity dose of 89Zr˗DFO˗REGN3504 and optimal post-infusion imaging time, as assessed by imaging and blood draw after tracer infusion

Study Part B only:

• To establish test/re-test reliability of positron emission tomography (PET) measures as assessed on 2 separate tracer infusions at adequate mass dose and optimal imaging time point as determined in Part A
• To characterize the pharmacokinetic (PK) profile of 89Zr˗DFO˗REGN3504 based on tracer plasma activity concentration

Study Overview

• Status: Terminated
• Conditions: Advanced PD-L1 Positive Malignancies
• Intervention / Treatment: Drug: 89Zr˗DFO˗REGN3504

• Study Type: Interventional
• Enrollment (Actual): 2
• Phase: Phase 1

Contacts and Locations

Study Locations

• United States
  • New York
    • New York, New York, United States, 10029
      • Regeneron Study Site
    • New York, New York, United States, 10032
      • Regeneron Study Site

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Key Inclusion Criteria:

• Participants with at least 1 radiologically measurable (by RECIST 1.1) lesion (Note: Lesions 10 mm in diameter or larger at the high end Program Dealth-Ligand 1 (PD-L1) expression are expected to be detectable by 89Zr-DFO-REGN3504 PET imaging).
• Availability of an archival, formalin-fixed, paraffin-embedded (FFPE) tumor tissue sample (blocks or slides) from a primary/metastatic/recurrent site, which has not been previously irradiated, with presence of any PD-L1 expression by Immunohistochemistry (IHC) in tumor or immune cells, performed by a Clinical Laboratory Improvement Amendments of 1988 (CLIA), a certified laboratory, using either freshly cut or archived FFPE slides. If the analysis will be done using archived FFPE slides, the slides must be <6 months old after being cut from the tissue block. The age of a tissue block is not limited. If the patient has a report of ≥1% PD-L1 expression, there is no need to repeat the assay; the report has no time limit.
• Eastern Cooperative Oncology Group (ECOG) performance status of ≤2 (Oken, 1982) and anticipated life expectancy of at least 3 months
• Adequate organ and bone marrow function

Key Exclusion Criteria:

• Participants receiving therapy with a monoclonal antibody against PD-L1 (eg. durvalumab, atezolizumab, avelumab) or have received treatment with anti-PD-L1 within 135 days prior to the 89Zr˗DFO˗REGN3504 infusion date
• For Part B only, participants in whom anti-PD-1 therapy was initiated 1 month or less, prior to the 89Zr˗DFO˗REGN3504 infusion date
• Active or untreated brain metastases or spinal cord compression. Participants are eligible if the central nervous system (CNS) metastases are adequately treated and participants' neurological symptoms have returned to baseline levels (except for residual signs or symptoms related to the CNS treatment) for at least 2 weeks prior to enrollment. Participants with brain metastases must be off doses of corticosteroid therapy that are considered by the investigator to be immunosuppressive
• Known history of human immunodeficiency virus or known acquired immunodeficiency syndrome indicating uncontrolled active infection. Participants on highly active antiretroviral therapy with undetectable RNA levels and CD4 counts above 350 are permitted
• Receipt of an investigational compound or device within 30 days of screening or within 5 half-lives of the investigational compound or therapy being studied (whichever is greater)
• Major surgery or significant traumatic injury within 4 weeks prior to first dose of 89Zr˗DFO˗REGN3504
• Known psychiatric or substance abuse disorder, including current use of any illicit drugs, that would interfere with the participant's participation in, or compliance with the requirements of, the study
• History of hypersensitivity response to any protein therapeutics (eg, recombinant proteins, vaccines, IV immune globulins, monoclonal antibodies, receptor traps). If a patient intends to receive a COVID-19 vaccine during Part A only, participation in the dose-escalation part of the study should be delayed at least 1 week after the final dose of COVID-19 vaccine before the start of study drug.
• Sexually active men and women of childbearing potential who are unwilling to practice highly effective contraception prior to the initial dose/start of the first treatment, during the study, and for at least 6 months after the last dose.
• Part B only: Has been enrolled in Part A

Note: Other Protocol Inclusion/Exclusion Criteria apply

Study Plan

How is the study designed?

Design Details

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

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: 89Zr˗DFO˗REGN3504; Part A: Cohorts 1-3 Part B	Drug: 89Zr˗DFO˗REGN3504; 89Zr˗DFO˗REGN3504

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Incidence and severity of treatment-emergent adverse events (TEAEs)	Baseline through 90 days after last dose of tracer infusion

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Standardized uptake value (SUV) of 89Zr˗DFO˗REGN3504 in the blood pool	Part A	Up to day 8
Clinical dosimetry based on the equivalent dose of radiation	Part A	Up to day 8
Clinical dosimetry based on the effective dose of radiation	Part A	Up to day 8
SUVs across the tumor region of interest (ROIs)	Part A	Up to day 8
Maximal SUVs (SUVmax) within tumor ROIs	Part A	Up to day 8
Pharmacokinetics (PK) of 89Zr˗DFO˗REGN3504; plasma tracer activity concentration of area under the curve (AUC0-7)	Part A	Up to day 8
Change in SUV of 89Zr˗DFO˗REGN3504 in the blood pool	Part B	Up to day 36 ± 14 days
Change in SUVs across the tumor ROIs	Part B	Up to day 36 ± 14 days
Change in SUVmax within the tumor ROIs	Part B	Up to day 36 ± 14 days
Biodistribution of 89Zr˗DFO˗REGN3504	Part B	Up to day 36 ± 14 days

Collaborators and Investigators

• Sponsor: Regeneron Pharmaceuticals

Study record dates

Study Major Dates

• Study Start (Actual): September 4, 2019
• Primary Completion (Actual): July 8, 2021
• Study Completion (Actual): July 8, 2021

Study Registration Dates

• First Submitted: November 15, 2018
• First Submitted That Met QC Criteria: November 15, 2018
• First Posted (Actual): November 20, 2018

Study Record Updates

• Last Update Posted (Actual): February 23, 2022
• Last Update Submitted That Met QC Criteria: February 7, 2022
• Last Verified: February 1, 2022

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Neoplasms
• Other Study ID Numbers: R3504-ONC-1701

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: Yes
• IPD Plan Description: All individual patient data (IPD) that underlie publicly available results will be considered for sharing
• IPD Sharing Time Frame: Individual anonymized participant data will be considered for sharing once the indication has been approved by a regulatory body, if there is legal authority to share the data and there is not a reasonable likelihood of participant re-identification.
• IPD Sharing Access Criteria: Qualified researchers may request access to anonymized patient level data or aggregate study data when Regeneron has received marketing authorization from major health authorities (e.g., FDA, European Medicines Agency (EMA), Pharmaceuticals and Medical Devices Agency (PMDA), etc) for the product and indication, has the legal authority to share the data, and has made the study results publicly available (eg, scientific publication, scientific conference, clinical trial registry).
• IPD Sharing Supporting Information Type: Study Protocol; Statistical Analysis Plan (SAP); Informed Consent Form (ICF); Clinical Study Report (CSR); Analytic Code

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No