Gene Therapy for Children With CLN3 Batten Disease

• ClinicalTrials.gov Identifier: NCT03770572
• Recruitment Status: Active, not recruiting
• First Posted: December 10, 2018
• Last Update Posted: July 20, 2022
• Sponsor: Amicus Therapeutics
• Information provided by (Responsible Party): Amicus Therapeutics

Study Description

Brief Summary:

This is a phase 1/2, open-label, single dose, dose-escalation clinical trial to evaluate the safety and efficacy of AT-GTX-502 (previous NCH Code: scAAV9.P546.CLN3) delivered intrathecally into the lumbar spinal cord region of subjects with CLN3 Batten disease.

Condition or disease	Intervention/treatment	Phase
CLN3; Batten Disease	Genetic: AT-GTX-502	Phase 1; Phase 2

Detailed Description:

This is a phase 1/2, open-label, single-dose, dose-escalation study of AT-GTX-502 administered intrathecally into the lumbar spinal cord region of pediatric patients with CLN3 Batten disease.

This study consists of a one-time injection of AT-GTX-502 with follow-up visits on Day 7, 14, 21, and 30, followed by every 3 months through 1 year post-dose, and then every 6 months through the second and third years. There are two Cohorts with a low dose and a high dose.

The primary outcome for this clinical study is to evaluate safety. The co-primary objective is to determine the efficacy of AT-GTX-502 as measured by United Batten Disease Rating Scale (UBDRS) physical subscale.

The secondary outcome measures include Pediatric Quality of Life (PedsQL) inventory, seizure subscale of the UBDRS and global impression subscale of the UBDRS.

The exploratory outcome measures include visual impairment assessment, cognitive evaluations, Brain magnetic resonance imaging (MRI), electroencephalogram (EEG), electrocardiogram (ECG) and echocardiogram (ECHO).

For more information about this study, please contact Amicus Therapeutics Patient Advocacy at clinicaltrials@amicusrx.com or +1 609-662-2000.

Study Design

• Study Type: Interventional (Clinical Trial)
• Estimated Enrollment: 7 participants
• Allocation: Non-Randomized
• Intervention Model: Single Group Assignment

Intervention Model Description

Single Treatment Group (AAV9-CLN3) - 2 Cohort Assignment (Low-dose, High-dose)

Dose escalation in this study will begin with low-dose, determined to be the minimal efficacious dose as determined in non-clinical studies. Dose escalation to a high-dose (2x the minimally effective dose (MED) as evaluated in Cohort 1) will proceed as part of Cohort 2 of the study upon demonstration of safety of the low-dose in Cohort 1 of the study.

• Masking: None (Open Label)
• Primary Purpose: Treatment
• Official Title: Phase I/IIa Gene Transfer Clinical Trial for Juvenile Neuronal Ceroid Lipofuscinosis, Delivering the CLN3 Gene by Self-Complementary AAV9
• Actual Study Start Date: November 13, 2018
• Estimated Primary Completion Date: June 2023
• Estimated Study Completion Date: September 2023

Arms and Interventions

Arm	Intervention/treatment
Experimental: Open-label, single-dose, dose-escalation study of AT-GTX-502; Cohort 1: AT-GTX-502 Low-Dose Cohort 2: AT-GTX-502 High-Dose	Genetic: AT-GTX-502; Subjects with diagnosis of CLN3 Batten disease will receive a single dose of AT-GTX-502 at low dose or high dose.

Outcome Measures

Primary Outcome Measures :

1. Safety evaluation based on the development of dose-limiting toxicity (DLT). [ Time Frame: 36 Months ]
   The DLT is defined as any unanticipated AE that is considered related to AT-GTX-502 and is Common Terminology Criteria for Adverse Events Grade 3 or higher.
2. Efficacy: Change in rating as determined using the Unified Batten Disease Rating Scale (UBDRS) rating scale. [ Time Frame: 36 months ]
   The UBDRS is a clinical ratings instrument used specifically to assess motor, seizure, behavioral and functional capabilities. The "Physical Assessment" is a 20 item subscale that measures vision, speech, motor strength, gait, abnormal involuntary movements and balance. Each item has a score range of 0 to 4. The minimum score is 0 and the maximum score is 112. The items are summed up to obtain a total score.The higher the score, the more severe the disability and worse the outcome.

Secondary Outcome Measures :

1. QOL: Change in Quality of Life (QOL) as determined using the Pediatric Quality of Life (PedsQL™) scale. [ Time Frame: 36 months ]
   The PedsQL is used to assess physical, emotional, social, and school functioning of pediatric subjects in ranging from 2 years to 18 years of age.
2. Seizures: Change is seizure subscore as determined using Seizure subscale of the UBDRS scale. [ Time Frame: 36 months ]
   The UBDRS seizure subscale is used to assess seizure history, type, frequency, duration, and frequency of seizure-related injury.
3. Global impression: Change in disease severity using the UBDRS clinical global impression (CGI) subscale. [ Time Frame: 36 months ]
   The clinical global impression subscale includes assessment of motor, seizure, behavioral and cognitive function in NCL subjects.

Eligibility Criteria

• Ages Eligible for Study: 3 Years to 10 Years (Child)
• Sexes Eligible for Study: All
• Accepts Healthy Volunteers: No

Criteria

Inclusion Criteria

1. Diagnosis of CLN3 Batten disease determined by genotype available at screening by a College of American Pathologists/Clinical Laboratory Improvement Amendments (CAP/CLIA)-certified laboratory (or a non-US laboratory with an equivalent national accreditation/certification)
2. Aged ≥ 3 to < 11 years
3. UBDRS physical impairment score of ≤ 7
4. Able to walk independently at least 50 feet

Exclusion Criteria

1. Presence of another inherited neurologic or metabolic disease, eg, other forms of Batten disease (also known as neuronal ceroid lipofuscinosis; NCL) or seizures unrelated to CLN3 Batten disease (subjects with febrile seizures may be eligible at the discretion of the investigator)
2. Presence of another neurological illness that may have caused cognitive decline (eg, trauma, meningitis, hemorrhage) before screening
3. Active viral infection (includes HIV or serology positive for hepatitis B or C)
4. Subjects with 2 consecutive aminotransaminase liver tests > 3 times the upper limit of normal or > 1.5 times the upper limit of normal if taking valproic acid at Visit 1 (screening/baseline)
5. Subjects with anti-AAV9 antibody titers > 1:400 as determined by ELISA (enzyme-linked immunosorbent assay) binding immunoassay
6. Abnormal laboratory values considered clinically significant
7. Presence of immunologic disease
8. Has received stem cell or bone marrow transplantation
9. Has received any form of organ transplant
10. History of or current chemotherapy, radiotherapy, or other immunosuppression therapy within the past 30 days (corticosteroid treatment may be permitted at the discretion of the investigator)
11. Current use of cannabinoids and any by-products
12. Contraindications for intrathecal administration of the product or lumbar puncture (for collection of CSF), such as bleeding disorders or other medical conditions (eg, spina bifida, meningitis, or clotting abnormalities)
13. Contraindications for MRI scans (eg, cardiac pacemaker, metal fragment or chip in the eye, aneurysm clip in the brain)
14. Poorly controlled seizures - intractable epilepsy
15. Episode of generalized motor status epilepticus within 4 weeks before the Gene Transfer visit
16. History of corneal or intraocular surgery
17. Severe infection (eg, upper respiratory tract infection, pneumonia, pyelonephritis, or meningitis) within 4 weeks before the Gene Transfer visit (Enrollment may be postponed.)
18. Has received any investigational medication within 30 days before the infusion of study drug
19. Has a medical condition or extenuating circumstance that, in the opinion of the investigator, might compromise the subject's ability to comply with the protocol required testing or procedures or compromise the subject's wellbeing, safety, or clinical interpretability
20. Pregnancy at screening or Day 0. Any female subject judged by the investigator to be of childbearing potential will be tested for pregnancy.
21. Family does not want to disclose subject's study participation with primary care physician and other medical providers

Contacts and Locations

Locations

United States, Ohio

Nationwide Children's Hospital

Columbus, Ohio, United States, 43201

Sponsors and Collaborators

Amicus Therapeutics

Investigators

• Study Director: Clinical Research; Amicus Therapeutics

More Information

Publications:

Schulz A, Kohlschutter A, Mink J, Simonati A, Williams R. NCL diseases - clinical perspectives. Biochim Biophys Acta. 2013 Nov;1832(11):1801-6. doi: 10.1016/j.bbadis.2013.04.008. Epub 2013 Apr 17.

Phillips SN, Benedict JW, Weimer JM, Pearce DA. CLN3, the protein associated with batten disease: structure, function and localization. J Neurosci Res. 2005 Mar 1;79(5):573-83. doi: 10.1002/jnr.20367.

Munroe PB, Mitchison HM, O'Rawe AM, Anderson JW, Boustany RM, Lerner TJ, Taschner PE, de Vos N, Breuning MH, Gardiner RM, Mole SE. Spectrum of mutations in the Batten disease gene, CLN3. Am J Hum Genet. 1997 Aug;61(2):310-6. doi: 10.1086/514846.

Drack AV, Mullins RF, Pfeifer WL, Augustine EF, Stasheff SF, Hong SD. Immunosuppressive Treatment for Retinal Degeneration in Juvenile Neuronal Ceroid Lipofuscinosis (Juvenile Batten Disease). Ophthalmic Genet. 2015;36(4):359-64. doi: 10.3109/13816810.2014.886271. Epub 2014 Feb 19.

Kwon JM, Adams H, Rothberg PG, Augustine EF, Marshall FJ, Deblieck EA, Vierhile A, Beck CA, Newhouse NJ, Cialone J, Levy E, Ramirez-Montealegre D, Dure LS, Rose KR, Mink JW. Quantifying physical decline in juvenile neuronal ceroid lipofuscinosis (Batten disease). Neurology. 2011 Nov 15;77(20):1801-7. doi: 10.1212/WNL.0b013e318237f649. Epub 2011 Oct 19.

Adams HR, Mink JW; University of Rochester Batten Center Study Group. Neurobehavioral features and natural history of juvenile neuronal ceroid lipofuscinosis (Batten disease). J Child Neurol. 2013 Sep;28(9):1128-36. doi: 10.1177/0883073813494813.

Ostergaard JR, Rasmussen TB, Molgaard H. Cardiac involvement in juvenile neuronal ceroid lipofuscinosis (Batten disease). Neurology. 2011 Apr 5;76(14):1245-51. doi: 10.1212/WNL.0b013e31821435bd.

Cotman SL, Vrbanac V, Lebel LA, Lee RL, Johnson KA, Donahue LR, Teed AM, Antonellis K, Bronson RT, Lerner TJ, MacDonald ME. Cln3(Deltaex7/8) knock-in mice with the common JNCL mutation exhibit progressive neurologic disease that begins before birth. Hum Mol Genet. 2002 Oct 15;11(22):2709-21. doi: 10.1093/hmg/11.22.2709.

• Responsible Party: Amicus Therapeutics
• ClinicalTrials.gov Identifier: NCT03770572
• Other Study ID Numbers: AT-GTX-502-01
• First Posted: December 10, 2018
• Last Update Posted: July 20, 2022
• Last Verified: July 2022

Individual Participant Data (IPD) Sharing Statement:

• Plan to Share IPD: No

• Studies a U.S. FDA-regulated Drug Product: Yes
• Studies a U.S. FDA-regulated Device Product: No

Keywords provided by Amicus Therapeutics:

CLN3; Neuronal ceroid lipofuscinosis; NCL; Gene Transfer

Additional relevant MeSH terms:

Neuronal Ceroid-Lipofuscinoses; Heredodegenerative Disorders, Nervous System; Neurodegenerative Diseases; Nervous System Diseases; Genetic Diseases, Inborn; Lipidoses; Lipid Metabolism, Inborn Errors; Metabolism, Inborn Errors; Lipid Metabolism Disorders; Metabolic Diseases