Study to Evaluate the Efficacy Safety and Tolerability of QR-421a in Subjects With RP Due to Mutations in Exon 13 of the USH2A Gene With Early to Moderate Vision Loss (Celeste)

Retinitis Pigmentosa Clinical Trial

Official title:

A Double-Masked, Randomized, Controlled, Multiple-Dose Study to Evaluate the Efficacy, Safety and Tolerability of QR-421a in Subjects With Retinitis Pigmentosa (RP) Due to Mutations in Exon 13 of the USH2A Gene With Early to Moderate Vision Loss

Clinical Trial Details — Status: Terminated

Administrative data

• NCT number: NCT05176717
• Other study ID #: PQ-421a-004
• Secondary ID: 2021-002728-19
• Status: Terminated
• Phase: Phase 2/Phase 3
• Start date: December 15, 2021
• Est. completion date: August 2, 2022

Study information

• Verified date: December 2022
• Source: ProQR Therapeutics
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The purpose of this study is to evaluate the efficacy safety and tolerability of QR-421a administered via intravitreal injection (IVT) in subjects with Retinitis Pigmentosa (RP) due to mutations in exon 13 of the USH2A gene with early to moderate vision loss.

Description:

The purpose of this study is to evaluate the efficacy safety and tolerability of QR-421a administered via intravitreal injection (IVT) in subjects with Retinitis Pigmentosa (RP) due to mutations in exon 13 of the USH2A gene with early to moderate vision loss. The below dose levels of QR-421a will be evaluated with the loading dose administered at Day 1 and maintenance dose administered at Month 3 and every 6 months thereafter: 1. Loading dose of 180 μg, maintenance dose of 60 μg 2. Loading dose of 60 μg, maintenance dose of 60 μg Dose levels will include subjects randomized to sham-procedure or treatment with QR-421a. After the study eye has been treated for at least 12 months, treatment of the fellow eye and cross-over of subjects assigned to sham-procedure may be initiated in eligible eyes based on assessment of benefit-risk.

Recruitment information / eligibility

• Status: Terminated
• Enrollment: 5
• Est. completion date: August 2, 2022
• Est. primary completion date: August 2, 2022
• Accepts healthy volunteers: No
• Gender: All
• Age group: 12 Years and older

Eligibility

Inclusion Criteria:

1. Male or female, = 18 years of age OR a minor (12 to < 18 years) with permission from a parent or legal guardian.

2. An adult willing to comply with the protocol, follow study instructions, attend study visits as required and willing and able to complete all study assessments. OR A minor able to complete all study assessments and comply with the protocol and has a parent or caregiver willing and able to follow study instructions, and attend study visits with the subject as required.

3. Clinical presentation consistent with RP with Usher syndrome type 2 or nonsyndromic form of RP (NSRP), based on ophthalmic, audiologic, and vestibular examinations.

4. A molecular diagnosis of homozygosity or compound heterozygosity for 1 or more pathogenic exon 13 mutations in the USH2A gene, based on genetic analysis at screening.

5. BCVA better than =69 letters (approximate Snellen equivalent 20/40) in the study eye, using the best BCVA reading at Screening.

6. Impairment of Visual Field (VF) in the opinion of the Investigator as determined by perimetry, with a continuous area of central field greater than or equal to 10 degrees diameter in each meridian as measured by a size V4e target, and a mean defect of = 10 dB, in the study eye.

7. Clearly visible and measurable ellipsoid zone (EZ) width and/or area on SDOCT, per investigator judgement.

8. No limitations to SD-OCT image collection that would prevent high quality, reliable images from being obtained in both eyes, as determined by the Investigator.

9. Reliable Best Corrected Visual Acuity (BCVA), perimetry, and other measurements in both eyes, as described in the Study Reference Manual and Imaging Manual and determined by the Investigator.

10. No visually significant ocular media opacities and adequate pupillary dilation to permit good quality retinal imaging, as assessed by the Investigator.

Exclusion Criteria:

1. Presence of additional non-exon 13 USH2A pathogenic mutation(s) on the USH2A allele carrying the exon 13 mutation in subjects who have monoallelic exon-13 mutations.

2. Presence of non-exon 13 USH2A pathogenic mutation(s) on both USH2A alleles in subjects who have biallelic exon 13 mutations.

3. Presence of pathogenic mutations in genes (other than the USH2A gene) associated with Usher syndrome Type 2 or NSRP, or other inherited retinal degenerative diseases or syndromes. Note: The confirmed presence of homozygous or compound heterozygous known disease-causing mutations in other genes involved in recessive retinal dystrophies (RD), or the confirmed presence of known disease-causing mutations in genes involved in dominant or X-linked retinal dystrophies is exclusionary.

4. Presence of any significant ocular or non-ocular disease/disorder (or medication and/or laboratory test abnormalities) which, in the opinion of the Investigator and with concurrence of the Medical Monitor, may either put the subject at risk because of participation in the study, may influence the results of the study, or the subject's ability to participate in the study. This includes but is not limited to a subject who has uncontrolled cystoid macular edema (CME) in the study eye. CME is permissible if stable for 3 months (with or without treatment). Past CME is permissible if resolved for more than 1 month.

5. History or presence of ocular herpetic diseases (including herpes simplex virus, varicella zoster or cytomegalovirus) in either eye.

6. Presence of any active ocular infection in either eye.

7. Presence of any of the following lens opacities in the study eye: cortical opacity = +2, posterior subcapsular opacity = +2, or a nuclear sclerosis = +2, and which are: 1) clinically significant in the opinion of the Investigator, 2) would adequately prevent clinical and photographic evaluation of the retina.

8. History of amblyopia in the study eye that resulted in significant vision loss, in the opinion of the Investigator.

9. Receipt within 3 months prior to Screening of any intraocular or periocular surgery (including refractive surgery), or an IVT injection other or planned intraocular surgery or procedure during the course of the study.

10. Current treatment or treatment within the past 12 months with therapies known to influence the immune system (including but not limited to steroid implants, cytostatics, interferons, tumor necrosis factor (TNF)-binding proteins, drugs acting on immunophilins, or antibodies with known impact on the immune system). Subjects that have been treated with systemic steroids within the past 12 months or that require intermittent use of topical steroids may be considered for inclusion following approval by the Medical Monitor.

11. A history of glaucoma or an IOP greater than 24 mmHg in either eye that is not controlled with medication or surgery.

12. Use of any investigational drug or device within 90 days or 5 half-lives preceding the first dose of study medication, whichever is longer, or plans to participate in another study of an investigational drug or device during the course of the study.

13. Any prior treatment with genetic or stem-cell therapy for ocular or non-ocular disease.

14. History of malignancy within 2 years prior to Screening, except adequately treated squamous or basal cell carcinoma of the skin or carcinoma in situ of the cervix that has been successfully treated.

15. Known hypersensitivity to antisense oligonucleotides or any constituents of the injection.

16. Pregnant and breastfeeding subjects. Females of childbearing potential and males must comply with using highly effective methods of contraception as defined in the protocol. Women of non-childbearing potential may be included without the use of adequate birth control.

Related Conditions & MeSH terms

• Deaf Blind
• Disease
• Eye Abnormalities
• Eye Diseases
• Eye Diseases, Hereditary
• Eye Disorders Congenital
• Genetic Diseases, Inborn
• Retinal Disease
• Retinal Diseases
• Retinitis
• Retinitis Pigmentosa
• Usher Syndrome Type 2
• Usher Syndromes
• Vision Disorders

Intervention

Drug:
• QR-421a
RNA antisense oligonucleotide for intravitreal injection

Other:
• Sham-procedure
Sham-procedure (no experimental drug administered)

Locations

Country	Name	City	State
United Kingdom	Moorfields Eye Hospital	London
United States	Retina Foundation of the Southwest	Dallas	Texas
United States	University of Wisconsin - Madison	Madison	Wisconsin

Sponsors (1)

Lead Sponsor	Collaborator
ProQR Therapeutics

Countries where clinical trial is conducted

United States,  United Kingdom, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Other	Change From Baseline in Mobility Course Score	Change from baseline in mobility course score	27 months
Primary	Change From Baseline in Mean Sensitivity	Change from baseline in mean sensitivity (based on static perimetry) at 12 months of treatment versus sham-procedure	12 months
Secondary	Ellipzoid Zone Area (EZ) as Measured by Spectral Domain Optical Coherence Tomography SD-OCT	Ellipzoid Zone area (EZ) as measured by Spectral Domain optical coherence tomography SD-OCT	27 months
Secondary	Change From Baseline in Best Corrected Visual Acuity (BCVA)	Change from baseline in Best Corrected Visual Acuity (BCVA)	27 months
Secondary	Change From Baseline in Spectral Domain Optical Coherence Tomography (SD-OCT) (Other Measures)	Change from baseline in Spectral domain optical coherence tomography (SD-OCT) (other measures)	27 months
Secondary	Change From Baseline in Low Luminance Visual Acuity (LLVA)	Change from baseline in Low Luminance Visual Acuity (LLVA) using the ETDRS vision chart	27 months
Secondary	Change From Baseline in Other Measures of Static Perimetry	Change from baseline in other measures of static perimetry on the Octopus 900 as assessed by a central reading center	27 months
Secondary	Change From Baseline in Full-field Stimulus Threshold (FST)	Change from baseline in Full-field Stimulus Threshold (FST) on the Diagnosys FST as assessed by a central reading center	27 months
Secondary	Change From Baseline in PRO Measure as Assessed by Michigan Retinal Degeneration Questionnaire (MRDQ)	Change from baseline in PRO measure as assessed by Michigan Retinal Degeneration Questionnaire (MRDQ)	27 months
Secondary	Change From Baseline in PRO Measures as Assessed by Patient Global Impressions of Severity (PGI-S)	Change from baseline in PRO measures as assessed by Patient Global Impressions of Severity (PGI-S)	27 months
Secondary	Change From Baseline in PRO Measures as Assessed by Patient Global Impressions of Change (PGI-C)	Change from baseline in PRO measures as assessed by Patient Global Impressions of Change (PGI-C)	27 months
Secondary	Ocular and Non-ocular Adverse Events (AEs)	Ocular and non-ocular adverse events (AEs)	27 months
Secondary	Cmax of QR-421a in Serum	Maximum concentration (Cmax) of QR-421a in serum	27 months