4D-125 in Patients With X-Linked Retinitis Pigmentosa (XLRP) | NCT04517149

Studies
4D-125 in Patients With X-Linked Retinitis Pigmentosa (XLRP)

NCT04517149

Sponsor

4D Molecular Therapeutics

Status

Active, not recruiting

Last Update Posted

Mar 21, 2025Actual

Enrollment

21Actual

Phase

Phase 1Phase 2

Conditions

X-Linked Retinitis Pigmentosa

Interventions

4D-125 IVT Injection
Observational

Countries

United States

Protocol Section

Identification Module Status Module Sponsor/Collaborators Module Oversight Module Description Module Conditions Module Design Module Arms/Interventions Module Outcomes Module Eligibility Module Contacts/Locations Module References Module IPD Sharing Statement Module

Results Section

Participant Flow Module Baseline Characteristics Module Outcome Measures Module Adverse Events Module More Info Module

Annotation Section

Annotation Module

Document Section

Large Document Module

Derived Section

Miscellaneous Info Module Condition Browse Module Intervention Browse Module

Protocol Section

Identification Module

NCT ID

Results Section

No data available

No data is available for this block.

Annotation Section

No data available

No data is available for this block.

Document Section

No data available

No data is available for this block.

Derived Section

Miscellaneous Info Module

Version Holder

Status Module

Record Verification Date

Mar 2025

Overall Recruitment Status or Expanded Access Status

Active, not recruiting

Last Known Status

Not provided

Delayed Posting

Not provided

Why Stopped

Not provided

Expanded Access Info

Start Date

Jun 9, 2020Actual

Primary Completion Date

Jun 2026Estimated

Completion Date

May 2029Estimated

First Submitted Date

Aug 14, 2020

First Submission Date that Met QC Criteria

Aug 14, 2020

First Posted Date

Aug 18, 2020Actual

Results Waived

Not provided

Results First Submitted Date

Not provided

Results First Submitted that Met QC Criteria

Not provided

Results First Posted Date

Not provided

Certification/Extension (aka Delayed Results) First Submitted Date

Not provided

Certification/Extension First Submitted that Passed QC Review

Not provided

Certification/Extension First Posted Date

Not provided

Last Update Submitted Date

Mar 19, 2025

Last Update Posted Date

Mar 21, 2025Actual

Oversight Module

Has Data Monitoring Committee (DMC)

Yes

Is FDA Regulated Drug

Yes

Is FDA Regulated Device

Is Unapproved Device

Not provided

Pediatric Postmarket Surveillance of a Device Product

Not provided

Product Exported from US

Not provided

FDAAA801 Violation

Not provided

Description Module

Brief Summary

This is a Phase 1/2 multicenter study with two parallel parts: an observational natural history cohort and an open-label, prospective interventional trial in males with non-syndromic X-linked retinitis pigmentosa (XLRP) due to mutations in the gene encoding retinitis pigmentosa GTPase regulator (RPGR).

Detailed Description

This Phase 1/2 study will gather data in an observational phase Natural History Cohort to further characterize and evaluate natural disease progression in male patients with genetically-confirmed X-linked retinitis pigmentosa (XLRP) caused by mutations in the gene encoding retinitis pigmentosa GTPase regulator (RPGR). The study will also evaluate the safety and tolerability, as assessed by frequency and severity of ocular and systemic adverse events, as well as preliminary clinical efficacy of a single intravitreal (IVT) injection of 4D-125 at two dose levels in this patient population in one or both eyes (the contralateral eye dose provided the subject is eligible and provides consent).

4D-125 has been developed as a gene replacement therapy for XLRP. After receiving 4D-125, patients will be followed for 24 months with continued safety follow-up and 36 additional months of long-term follow-up. Secondary endpoints will assess preliminary efficacy measures over time after 4D-125 administration.

Design Module

Study Type

Interventional

Number of References to an Expanded Access Study

Not provided

Expanded Access Types

Not provided

Patient Registry

Not provided

Target Follow-Up Duration

Not provided

Phases

Phase 1Phase 2

Interventional Study Design

Allocation

Biospecimen

No data available

No data is available for this block.

Enrollment

21Actual

Arms/Interventions Module

Arm Groups

Label	Type	Description	Intervention Names
4D-125 Dose Exploration	Experimental	Dose 1 and Dose 2 4D-125 will be administered at the assigned dose level as a single dose, IVT injection on Day 1. The contralateral eye may also be dosed with 4D-125 as a single dose, IVT injection provided the subject is eligible and provides consent.	Biological: 4D-125 IVT Injection
4D-125 Dose Expansion	Experimental	4D-125 will be administered at the assigned dose level as a single dose, IVT injection on Day 1 in both adults and pediatric participants. For adult participants only, the contralateral eye may also be dosed with 4D-125 as a single dose, IVT injection provided the subject is eligible and provides consent.	Biological: 4D-125 IVT Injection
Observational	Other	Natural History	Other: Observational

Interventions

Name	Type	Description	Arm Group Labels	Other Names
4D-125 IVT Injection	Biological	4D-125 drug product developed for gene therapy, which comprises an AAV capsid variant (4D-R100) carrying a codon-optimized human Retinitis Pigmentosa GTPase Regulator transgene.

Outcomes Module

Primary Outcomes

Measure	Description	Time Frame
Incidence and severity of TEAEs and serious adverse events (SAEs), including clinically significant changes in safety parameters		24 months to 60 Months

Secondary Outcomes

Not provided

Other Outcomes

Not provided

Eligibility Module

Eligibility Criteria

Natural History Key Inclusion Criteria:

Male, ≥ 6 years of age at the time of informed consent
Hemizygous non-syndromic RPGR mutation confirmed by genetic testing

Interventional Key Inclusion Criteria:

Male, ≥12 years of age
Hemizygous non-syndromic RPGR mutation confirmed by genetic testing
Phase 1 Dose Exploration: At least one eye amenable to IVT injection and BCVA ≤ 78 ETDRS letters (~20/32) and ≥ 34 ETDRS letters (~20/200)
Phase 2 Dose Expansion: At least one eye amenable to IVT injection AND both eyes must have BCVA ≥ 34 ETDRS letters (~20/200)

Key Exclusion Criteria (all cohorts)

Patient has previously received any AAV treatment
Pre-existing eye conditions or surgical complications that would preclude participation in an interventional clinical trial or interfere with the interpretation of study endpoints

Accepts Healthy Volunteers

Sex

Male

Sex/Gender Based

Not provided

Sex/Gender Description

Not provided

Minimum Age

12 Years

Maximum Age

Not provided

Standard Ages

ChildAdultOlder Adult

Study Population

Not provided

Sampling Method

Not provided

Contacts/Locations Module

Central Contacts

Not provided

Overall Officials

Name	Affiliation	Role
Schonmei Lee, MD	4D Molecular Therapeutics	Study Director

Locations

Facility	Status	City	State	ZIP	Country	Contacts
University of Colorado		Aurora	Colorado	80045	United States
Vitreo Retinal Associates

IPD Sharing Statement Module

Plan to Share IPD

Description

Not provided

Types

Not provided

Time Frame

Not provided

Access Criteria

Not provided

URL

Not provided

Intervention Browse Module

MeSH Terms

ID	Term
D057832	Watchful Waiting

Ancestor Terms

ID	Term
D017063	Outcome Assessment, Health Care
D010043	Outcome and Process Assessment, Health Care
D011787	Quality of Health Care
D006298	Health Services Administration

Browse Leaves

Not provided

Browse Branches

Not provided

Intervention Model Description

In Phase 1, up to 2 dose exploration cohorts will be enrolled; each cohort will initially recruit up to 3 patients to receive a single uniocular IVT injection of 4D-125 in a standard 3+3 design. The cohort will be expanded in the event of a dose limiting toxicity (DLT). Any cohort may be expanded by an additional 3 subjects (to a maximum of 12 patients) to provide additional safety information and/or to confirm the selected dose for expansion. Once the dose level has been selected, the Phase 2 Dose Expansion Cohort will be opened to dose an additional 6-12 adult patients, and includes a pediatric sub-population of up to 6 patients. For adult participants only, the contralateral eye may also be dosed with 4D-125 as a single dose, IVT injection provided the subject is eligible and provides consent.