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Rezpegaldesleukin

Phase 3

Moderate to Severe Atopic Dermatitis | Small molecule | Dermatology |Nektar Therapeutics|Trials Updated: Oct 21, 2026

Rezpegaldesleukin development status

Highest phase Phase 3
Registered trials 13 across 1 sponsor since Jun 2018

Rezpegaldesleukin target and mechanism

Molecular targetIL-2
ModalitySmall molecule

Also known as NKTR-358, REZPEG, LY3471851 (formerly), LY3471851

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials8
Total Enrollment1,927

FDA Designations

FAST_TRACK

Rezpegaldesleukin clinical trials

Rezpegaldesleukin · 8 trials · 6 indications

Phase 3 2Phase 2 3Phase 1 3
NCT07711418A Phase 3 Study of Rezpegaldesleukin (NKTR-358) for Patients ≥ 12 Years of Age With Moderate-to-Severe Atopic DermatitisModerate-to-Severe Atopic Dermatitis
RECRUITING510 Analytics
NCT07690371A Phase 3 Study of Rezpegaldesleukin (NKTR-358) for Patients ≥ 12 Years of Age With Moderate-to-Severe Atopic DermatitisModerate-to-Severe Atopic Dermatitis
RECRUITING510 Analytics
PHASE3RECRUITING
A Phase 3 Study of Rezpegaldesleukin (NKTR-358) for Patients ≥ 12 Years of Age With Moderate-to-Severe Atopic Dermatitis
Moderate-to-Severe Atopic DermatitisUnlock trial analytics
PHASE3RECRUITING
A Phase 3 Study of Rezpegaldesleukin (NKTR-358) for Patients ≥ 12 Years of Age With Moderate-to-Severe Atopic Dermatitis
Moderate-to-Severe Atopic DermatitisUnlock trial analytics

Study Endpoints

Primary Endpoints

US only: Number of participants with an Investigator's Global Assessment (IGA) score of 0 or 1 and reduction ≥ 2 points from baseline at Week 24
Week 0 and Week 24

The IGA scale ranges from 0 to 4, with higher score indicating more severe disease.

Non-US regions only: Number of participants with an Investigator's Global Assessment (IGA) score of 0 or 1 at Week 24
Week 0 and Week 24

The IGA scale ranges from 0 to 4, with higher score indicating more severe disease.

Non-US regions only: Number of participants with a ≥ 75% reduction in Eczema Area and Severity Index (EASI) score from baseline at Week 24 (EASI-75)
Week 0 and Week 24

The EASI scores range from 0 to 72, with higher scores indicating more severe atopic dermatitis.

Percent change from baseline in Severity of Alopecia Tool (SALT) score at Week 36
Baseline and Week 36

The SALT score is the sum of percentage of hair loss in all areas with a maximum score of 100 (higher score indicates greater hair loss).

Mean percent change in the Eczema Area and Severity Index (EASI) from baseline at Week 16
Week 0 and Week 16

The EASI scores range from 0 to 72, with higher scores indicating more severe atopic dermatitis.

Percentage of Participants Who Achieved a ≥4 Point Reduction in Systemic Lupus Erythematosus Disease Activity Index (SLEDAI) 2000 (2K) Score at Week 24
Week 24

Percentage of Participants who Achieved a ≥4 Point Reduction in SLEDAI-2K Score at Week 24. A SLEDAI-4 response is defined as a ≥4-point reduction in Systemic Lupus Erythematosus Disease Activity Index 2000 (SLEDAI-2K) score from baseline. The SLEDAI-2K score range is from a minimum of 0 to a maximum of 105 (higher scores represent higher disease activity).

Number of Participants with One or More Serious Adverse Event(s) (SAEs) Considered by the Investigator to be Related to Study Drug Administration
Baseline through Study Completion (up to Week 48)

A summary of SAEs and other non-serious adverse events (AEs), regardless of causality, will be reported in the Reported Adverse Events module

Safety and Tolerability of LY3471851 - Number of Participants Experiencing Adverse Events
Informed consent until last study visit (approximately 79 days after first dose of study drug)

Safety and tolerability of LY3471851 as assessed through collection of adverse events, serious adverse events, change in vital signs (body temperature, blood pressure, heart rate, rate of breathing and oxygen in blood); electrocardiograms (ECG); laboratory evaluations (hematology, chemistry, liver function and urine analysis).

Secondary Endpoints

US only: Number of participants with a ≥ 75% reduction in EASI score from baseline at Week 24 (EASI-75)
Week 0 and Week 24
Number of participants with a ≥ 90% reduction in EASI score from baseline at Week 24 (EASI-90)
Week 0 and Week 24
Number of participants at week 6 achieving a 4-point or greater improvement in Itch numerical rating scale (NRS) in the subset of participants with a 4-point or greater Itch NRS at baseline
Week 0 and Week 6
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Blinded Induction Period: Rezpegaldesleukin every 2 weeksEXPERIMENTALRezpegaldesleukin every 2 weeks during the induction period
Blinded Induction Period: PlaceboPLACEBO_COMPARATORPlacebo every 2 weeks during the induction period
Blinded Maintenance Period: Rezpegaldesleukin every 4 weeksEXPERIMENTALRezpegaldesleukin every 4 weeks during the maintenance period
Blinded Maintenance Period: Rezpegaldesleukin every 12 weeksEXPERIMENTALRezpegaldesleukin every 12 weeks during the maintenance period
Blinded Maintenance Period: PlaceboPLACEBO_COMPARATORPlacebo every 4 weeks during the maintenance period
Open-Label EscapeEXPERIMENTALRezpegaldesleukin at a frequency determined by the investigator during the open-label escape
Low DoseEXPERIMENTALRezpegaldesleukin Low Dose Every 2 weeks
High DoseEXPERIMENTALRezpegaldesleukin High Dose Every 2 weeks
PlaceboPLACEBO_COMPARATORPlacebo Every 2 weeks
Arm AEXPERIMENTALRezpegaldesleukin Dose Regimen A every 2 weeks during the induction period
Arm A1EXPERIMENTALRezpegaldesleukin Dose Regimen A every 4 weeks during the maintenance period
Arm A2EXPERIMENTALRezpegaldesleukin Dose Regimen A every 12 weeks during the maintenance period
Arm BEXPERIMENTALRezpegaldesleukin Dose Regimen B every 4 weeks during the induction period
Arm B1EXPERIMENTALRezpegaldesleukin Dose Regimen B every 4 weeks during the maintenance period
Arm B2EXPERIMENTALRezpegaldesleukin Dose Regimen B every 12 weeks during the maintenance period
Arm CEXPERIMENTALRezpegaldesleukin Dose Regimen C every 2 weeks during the induction period
Arm C1EXPERIMENTALRezpegaldesleukin Dose Regimen C every 4 weeks during the maintenance period
Arm C2EXPERIMENTALRezpegaldesleukin Dose Regimen C every 12 weeks during the maintenance period
Arm DPLACEBO_COMPARATORPlacebo every 2 weeks during the induction period
Arm D1PLACEBO_COMPARATORPlacebo every 4 weeks during the maintenance period
Escape Therapy (open-label)EXPERIMENTALRezpegaldesleukin Dose Regimen A every 2 weeks during the maintenance period
LY3471851 High DoseEXPERIMENTALLY3471851 administered subcutaneously (SC).
LY3471851 Mid DoseEXPERIMENTALLY3471851 administered SC.
LY3471851 Low DoseEXPERIMENTALLY3471851 administered SC
10 µg/kg LY3471851ACTIVE_COMPARATORParticipants received subcutaneous (SC) injection of 10 microgram per kilogram (μg/kg) LY3471851 every 2 weeks for a treatment period of 12 weeks.
12 µg/kg LY3471851ACTIVE_COMPARATORParticipants received subcutaneous injection of 12 μg/kg LY3471851 every 2 weeks for a treatment period of 12 weeks.
24 µg/kg LY3471851ACTIVE_COMPARATORParticipants received subcutaneous injection of 24 μg/kg LY3471851 every 2 weeks for a treatment period of 12 weeks.
Cohort 1 - 10 (Microgram Per Kilogram) μg/kg LY3471851EXPERIMENTALParticipants received 10 μg/kg of LY3471851 SC every 2 weeks for a period of 12 weeks.
Cohort 2 - 24 μg/kg LY3471851EXPERIMENTALParticipants received 24 μg/kg of LY3471851 SC every 2 weeks for a period of 12 weeks.
Cohort 1 - 3 μg/kg LY3471851EXPERIMENTALParticipants received 3 microgram per kilogram (μg/kg) of LY3471851 or placebo on days 1, 15 and 29 by subcutaneous (SC) injection.
Cohort 1 - 6 μg/kg LY3471851EXPERIMENTALParticipants received 6 μg/kg of LY3471851 or placebo on days 1, 15 and 29 by SC injection.
Cohort 1 - 12 μg/kg LY3471851EXPERIMENTALParticipants received 12 μg/kg of LY3471851 or placebo on days 1, 15 and 29 by SC injection.
Cohort 1 - 24 μg/kg LY3471851EXPERIMENTALParticipants received 24 μg/kg of LY3471851 or placebo on days 1, 15 and 29 by SC injection.

Interventions

NameTypeDescription
RezpegaldesleukinDRUGPharmaceutical form: Injection solution Route of administration: subcutaneous
PlaceboDRUGPharmaceutical form: Injection solution Route of administration: subcutaneous
LY3471851DRUGAdministered SC
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Eligibility Criteria

Age Range12 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites13

Inclusion Criteria: * Male or female patients, ≥ 12 years of age on the day of signing the informed consent form and weighing ≥ 40 kg prior to randomization at Baseline * Chronic atopic dermatitis (AD) defined as onset of AD signs and symptoms ≥ 12 months prior to Screening as determined by the ...

Countries:United StatesCanadaPolandAustraliaBulgariaCroatiaCzechiaGermanyHungarySpainArgentinaIndiaIsraelJapanMexicoPuerto RicoRomaniaRussiaSouth KoreaTaiwanUkraine
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Recent Changes (Last 90 Days)

LOWOct 21, 2026NCT07690371lastUpdatePostDate: changed
LOWOct 21, 2026NCT07690371lastUpdatePostDate: changed
LOWOct 21, 2026NCT07690371lastUpdatePostDate: changed
MEDIUMOct 19, 2026NCT06340360TRIAL_REMOVED: changed
MEDIUMOct 19, 2026NCT06340360TRIAL_REMOVED: changed
MEDIUMOct 19, 2026NCT06340360TRIAL_REMOVED: changed
MEDIUMOct 19, 2026NCT06340360TRIAL_REMOVED: changed
HIGHSep 19, 2026NCT06340360Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHSep 19, 2026NCT06340360Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHSep 19, 2026NCT06340360Status: ACTIVE_NOT_RECRUITING → COMPLETED
LOWSep 15, 2026NCT07690371lastUpdatePostDate: changed
LOWSep 15, 2026NCT07690371lastUpdatePostDate: changed
LOWSep 15, 2026NCT07690371lastUpdatePostDate: changed
LOWSep 8, 2026NCT07711418startDate: changed
LOWSep 8, 2026NCT07711418startDate: changed
LOWAug 21, 2026NCT06136741lastUpdatePostDate: changed
LOWAug 21, 2026NCT06136741lastUpdatePostDate: changed
LOWAug 4, 2026NCT07690371startDate: changed
LOWAug 4, 2026NCT07690371startDate: changed
LOWAug 3, 2026NCT06136741lastUpdatePostDate: changed

Frequently asked questions about Rezpegaldesleukin

What is Rezpegaldesleukin used for?

Rezpegaldesleukin is an investigational therapy being studied for moderate to severe atopic dermatitis and severe to very severe alopecia areata. It is in clinical development and has not been approved by the FDA. Nektar Therapeutics holds Fast Track designation for the program.

What does Rezpegaldesleukin target?

Rezpegaldesleukin targets IL-2, or interleukin-2. By engaging the IL-2 pathway, the drug is designed to modulate immune cell activity relevant to inflammatory skin conditions such as atopic dermatitis and alopecia areata. It is being developed by Nektar Therapeutics.

Who is developing Rezpegaldesleukin?

Rezpegaldesleukin is being developed by Nektar Therapeutics, which trades under the ticker NKTR. The company is running clinical trials of the drug in atopic dermatitis and alopecia areata across multiple countries, including the United States, Canada, and several European nations.

What phase is Rezpegaldesleukin in?

Rezpegaldesleukin is in Phase 2 and Phase 3 clinical development. Two Phase 3 trials in moderate to severe atopic dermatitis are currently recruiting, while Phase 2b studies have been completed or are active but not recruiting. The drug remains investigational and has not received FDA approval.

What clinical trials is Rezpegaldesleukin in?

Rezpegaldesleukin is being studied in several trials, including NCT07711418 and NCT07690371, both Phase 3 studies in moderate to severe atopic dermatitis. The Phase 2b Rezolve AA trial, NCT06340360, evaluated the drug in alopecia areata, and NCT06136741 is a Phase 2b study in atopic dermatitis.

Is Rezpegaldesleukin the same as NKTR-358?

Yes, Rezpegaldesleukin is also known as NKTR-358 and is sometimes referred to as Rezpeg. These names refer to the same investigational drug developed by Nektar Therapeutics for atopic dermatitis and alopecia areata. It is currently in Phase 2 and Phase 3 clinical testing.