A Clinical Trial of Multiple Doses of GR2301 Injection in Participants With Vitiligo. (GREVIT-II)

November 5, 2026 updated by: Genrix (Shanghai) Biopharmaceutical Co., Ltd.

A Phase II, Randomized, Double-Blind, Placebo-Controlled Clinical Trial to Evaluate the Efficacy, Safety, Pharmacokinetics, and Pharmacodynamics of Multiple Subcutaneous Administrations of GR2301 Injection in Participants With Vitiligo.

This is a Phase II, randomized, double-blind, placebo-controlled clinical trial of multiple subcutaneous administrations of GR2301 Injection to evaluate the efficacy, safety, pharmacokinetics, and pharmacodynamics in trial participants with vitiligo. Eligible trial participants will be randomized using stratified block randomization, with competitive enrollment across sites; they will be assigned to the experimental group or the control group in the order of successful screening.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

120

Phase

  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 75 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Main Inclusion Criteria:

  1. Meet the clinical diagnosis of non-segmental vitiligo at screening visit and baseline visit, and meet the following criteria: clinical diagnosis of vitiligo for at least 3 months at screening visit; F-VASI and T-VASI scores meet the criteria at screening visit and baseline visit.
  2. Able to understand and comply with the requirements of the clinical protocol, voluntarily participate in the clinical trial, and provide signed written informed consent by the trial participant or their legally authorized representative.

Main Exclusion Criteria:

  1. Vitiligo-related medical conditions and other dermatologic diseases/conditions.
  2. Prior permanent tattooing or grafting within the vitiligo lesions.
  3. Are unwilling or unable to comply with the permitted and prohibited concomitant medications/treatment specifications of this trial, and cannot meet the protocol-required washout period for medications/treatments prior to randomization.
  4. Have a serious underlying disease that, in the investigator's opinion, may pose a safety risk to the trial participant if enrolled in the clinical trial.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Placebo Comparator: Placebo
Biological: Placebo

Placebo
Experimental: GR2301 injection Group1
Biological: GR2301 injection

IL15 monoclonal antibody
Experimental: GR2301 injection Group2
Biological: GR2301 injection

IL15 monoclonal antibody
Experimental: GR2301 injection Group3
Biological: GR2301 injection

IL15 monoclonal antibody

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Proportion of trial participants achieving F-VASI50 at the Week 24 (W24) visit.
Time Frame: Week 24

VASI(vitiligo area scoring index) is a clinician-reported outcome used to assess the affected body surface area and the degree of depigmentation. F-VASI represents the assessment of facial vitiligo lesions. F-VASI50 means percentage of subjects with at least a 50% decrease from baseline in F-VASI. The higher the VASI score, the more severe the skin lesion.
Week 24

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Genrix (Shanghai) Biopharmaceutical Co., Ltd.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

November 1, 2026

Primary Completion (Estimated)

May 1, 2028

Study Completion (Estimated)

November 1, 2028

Study Registration Dates

First Submitted

November 5, 2026

First Submitted That Met QC Criteria

November 5, 2026

First Posted (Actual)

November 10, 2026

Study Record Updates

Last Update Posted (Actual)

November 10, 2026

Last Update Submitted That Met QC Criteria

November 5, 2026

Last Verified

November 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • GR2301-005

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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