Study to Evaluate the Safety and Efficacy of CSB-001 Ophthalmic Solution 0.1% in Subjects With Limbal Stem Cell Deficiency

August 11, 2026 updated by: Claris Biotherapeutics, Inc.

An Open-Label Study Evaluating the Safety and Efficacy of CSB-001 Ophthalmic Solution 0.1% in Subjects With Limbal Stem Cell Deficiency

This study will enroll subjects with qualifying limbal stem cell deficiency (LSCD). All subjects will receive CSB-001 investigational drug in either one or both study eyes. The study is comprised of two identical phases (Dosing Phase I and II) of test article dosing separated by a 31- to 40-day period, the Dosing Holiday, where no test article is administered. Dosing Phase II is followed by an observational, noninterventional phase (Observation Phase).

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
75

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 1

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

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • United States
    • California
      • Loma Linda, California, United States, 92354
        • Recruiting
        • Loma Linda University Eye Institute
        • Contact:
          • Study Coordinator
    • Indiana
      • Carmel, Indiana, United States, 46290
        • Recruiting
        • Midwest Cornea Associates, LLC
        • Contact:
          • Study Coordinator
      • Indianapolis, Indiana, United States, 46260
        • Recruiting
        • Francis Price Jr, MD
        • Contact:
          • Study Coordinator
    • Minnesota
      • Minnetonka, Minnesota, United States, 55305
        • Recruiting
        • Minnesota Eye Consultants
        • Contact:
          • Study Coordinator
    • Oregon
      • Portland, Oregon, United States, 97210
        • Recruiting
        • Legacy Devers Eye Institute
        • Contact:
          • Study Coordinator
    • Texas
      • San Antonio, Texas, United States, 78212
        • Recruiting
        • Stuart A. Terry, MD PA
        • Contact:
          • Study Coordinator

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Have an area of the central 5 mm zone of cornea affected, presence of at least one clinical sign observed by slit-lamp examination with white light and/or cobalt blue light, fluorescein, and a Wratten filter, and at least one clinical sign observed with AS-OCT.
  • If dosing with Acthar at time of Screening Visit, must have a history of stable dosing for approximately 8 weeks, plan to maintain the same Acthar treatment dose and regimen, and have demonstrated little to no improvement in severity of LSCD.
  • Sponsor written confirmation of qualifying LSCD diagnosis.
  • Inflammation associated with LSCD or other non-infectious inflammation that will not interfere with subject's participation.

Exclusion Criteria:

  • Any active ocular infection (bacterial, viral, fungal, or protozoan) in either eye.
  • Ocular surgery within 30 days of Day 0 where investigator assesses that healing is not considered complete/stable.
  • Planned ocular surgery on or before Week 20 visit.
  • Presence or history of any ocular or systemic disorder, condition, or procedure that might hinder the efficacy of the study treatment or its evaluation, or could interfere with the interpretation of study results, in the opinion of the investigator.

Note: Other inclusion/exclusion criteria apply.

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: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Control
Period I: Subjects will be observed (non-interventional) for 20 weeks. Period II: Subjects will be dosed one drop CSB-001 four times daily for two 8-week dosing periods in the study eye(s) separated by >30 days and <40 days (dosing holiday) followed by observation (non-interventional) to Week 48. Period III: Subjects may elect to participate in the Observation Extension Phase (non-interventional) for an additional 36 months to Week 144.
Biological: CSB-001 Ophthalmic Solution 0.1%
CSB-001: human recombinant dHGF (5-amino acid deleted hepatocyte growth factor)
Experimental: CSB-001 QID
Period I: Subjects will be dosed one drop CSB-001 four times daily for two 8-week dosing periods in the study eye(s) separated by >30 days and <40 days (dosing holiday) followed by observation (non-interventional) to Week 20. Period II: Subject will be observed (non-interventional) for 28 weeks to Week 48. Period III: Subjects may elect to participate in the Observation Extension Phase (non-interventional) for an additional 36 months to Week 144.
Biological: CSB-001 Ophthalmic Solution 0.1%
CSB-001: human recombinant dHGF (5-amino acid deleted hepatocyte growth factor)

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Safety as Assessed by Adverse Event Reporting
Time Frame: Day 0 through Week 144
Incidence of ocular and systemic adverse events
Day 0 through Week 144
Safety as Assessed by Slit-lamp Biomicroscopy
Time Frame: Day 0 through Week 144
Change from baseline in slit-lamp parameters
Day 0 through Week 144
Safety as Assessed by Best-corrected Distance LogMAR Visual Acuity
Time Frame: Day 0 through Week 144
Change from baseline using the Early Treatment Diabetic Retinopathy Study (ETDRS) visual acuity chart
Day 0 through Week 144

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Efficacy as Assessed by Change in Stage of LSCD
Time Frame: Day 0 through Week 144
Change from baseline in LSCD signs based on imaging (white light, blue light with fluorescein and Wratten filter, and AS-OCT)
Day 0 through Week 144
Efficacy as Assessed by Change in Best-corrected Distance LogMAR Visual Acuity
Time Frame: Day 0 through Week 144
Visual acuity measured using the EDTRS visual acuity chart
Day 0 through Week 144

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Claris Biotherapeutics, Inc.

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 (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
May 15, 2024

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 31, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 31, 2027

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
June 5, 2024

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
June 5, 2024

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
June 11, 2024

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
August 13, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 11, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
August 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • CSB-C23-001

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

Yes

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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