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REGN9533

Phase 1

End-Stage Kidney Disease (ESKD) | Small molecule | Other |Regeneron Pharmaceuticals, Inc.|Trials Updated: Feb 6, 2026

REGN9533 development status

Highest phase Phase 1
Registered trials 2 across 1 sponsor since Oct 2024

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLED
Total Trials1
Total Enrollment72

FDA Designations

No designations recorded

REGN9533 clinical trials

REGN9533 · 1 trial · 1 indication

Phase 1 1
NCT06665828Phase 1 Safety and Tolerability Study of REGN9533 in Healthy AdultsHealthy Volunteer
COMPLETED72 Analytics
PHASE1COMPLETED
Phase 1 Safety and Tolerability Study of REGN9533 in Healthy Adults
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Study Endpoints

Primary Endpoints

Incidence of Treatment Emergent Adverse Events (TEAEs)
Up to 100 days
Severity of TEAEs
Up to 100 days

Secondary Endpoints

Change in activated Partial Thromboplastin Time (aPTT)
Baseline up to 100 days
Change in Prothrombin Time (PT)
Baseline up to 100 days
Concentrations of REGN9533
Up to 100 days
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
REGN9533EXPERIMENTALRandomized as described in the protocol Escalating Cohorts including Optional Cohorts
PlaceboEXPERIMENTALRandomized as described in the protocol

Interventions

NameTypeDescription
REGN9533DRUGAdministered per the protocol
Matching PlaceboDRUGAdministered per the protocol.
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Eligibility Criteria

Age Range18 Years to 55 Years
SexALL
Healthy VolunteersYes
Study Sites1

Key Inclusion Criteria: 1. Has a body mass index between 18 and 32 kg/m2, inclusive 2. Is judged by the investigator to be in good health based on medical history, physical examination, vital sign measurements, and electrocardiograms (ECGs) performed at screening and/or prior to administration of i...

Countries:Belgium
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Frequently asked questions about REGN9533

What is REGN9533?

REGN9533 is an investigational small molecule being developed by Regeneron Pharmaceuticals, Inc. It is in Phase 1 clinical development, with one completed Phase 1 trial conducted in healthy adult volunteers. Regeneron is exploring REGN9533 in the context of end-stage kidney disease (ESKD).

What is REGN9533 used for in end-stage kidney disease?

REGN9533 is being investigated for end-stage kidney disease (ESKD), a condition in which the kidneys no longer function adequately. The program remains in Phase 1 development, and the completed trial enrolled healthy adult volunteers rather than patients with ESKD, so no efficacy in ESKD has been established.

Who makes REGN9533?

REGN9533 is developed by Regeneron Pharmaceuticals, Inc., which trades on the Nasdaq under the ticker REGN. Regeneron is the sponsor of the REGN9533 clinical program, including the completed Phase 1 study conducted in Belgium.

What phase is REGN9533 in?

REGN9533 is in Phase 1 development. One Phase 1 trial has been completed, and no active trials are currently listed. The program is investigational and has not been approved by the FDA for any indication.

What clinical trials is REGN9533 in?

REGN9533 has been studied in one Phase 1 trial, NCT06665828, titled a Phase 1 Safety and Tolerability Study of REGN9533 in Healthy Adults. The trial was completed, enrolled 72 participants, was randomized, double-blind, and controlled, and was conducted in Belgium.

Who was enrolled in the REGN9533 Phase 1 trial?

The Phase 1 trial of REGN9533, NCT06665828, enrolled 72 healthy adult volunteers aged 18 years and older of all sexes. It was a randomized, double-blind, controlled study conducted in Belgium, and it has been completed.