A Gene Transfer Therapy Study to Evaluate the Safety of and Expression From Delandistrogene Moxeparvovec (SRP-9001) in Participants With Duchenne Muscular Dystrophy (DMD) (ENDEAVOR)

Sarepta Therapeutics

Status and phase

Active, not recruiting

Phase 1

Conditions

Muscular Dystrophy, Duchenne

Treatments

Genetic: delandistrogene moxeparvovec

Study type

Interventional

Funder types

Industry

Identifiers

NCT04626674

SRP-9001-103

Details and patient eligibility

About

This is an open-label gene transfer therapy study evaluating the safety of and expression from delandistrogene moxeparvovec in participants with DMD. The maximum participant duration for this study is 156 weeks.

Enrollment

55 patients

Sex

Male

Ages

2+ years old

Volunteers

No Healthy Volunteers

Inclusion criteria

For Cohorts 1-7: Has a definitive diagnosis of DMD based on documented clinical findings and prior genetic testing.
Cohort 1: Is ambulatory, and ≥4 to <8 years of age at the time of Screening.
Cohort 2: Is ambulatory, and ≥8 to <18 years of age at the time of Screening.
Cohort 3: Non-ambulatory per protocol specified criteria at the time of Screening.
Cohort 4: Is ambulatory and ≥3 to <4 years of age at the time of Screening.
Cohort 5a: Is ambulatory and ≥4 to <9 years of age.
Cohort 5b: Non-ambulatory per protocol specified criteria at the time of Screening.
Cohort 6: Is ambulatory, and ≥2 to <3 years of age at the time of Screening.
Cohort 7: Non-ambulatory per protocol-specified criteria at the time of Screening.
Ability to cooperate with motor assessment testing.
Cohorts 1, 2, 3, 5, and 7 only: Stable dose equivalent of oral glucocorticoids for at least 12 weeks before screening and the dose is expected to remain constant (except for modifications to accommodate changes in weight) throughout the first year of the study.
Cohorts 4 and 6: Do not yet require use of chronic steroids for treatment of their DMD, in the opinion of the Investigator, and are not receiving steroids at the time of Screening.
rAAVrh74 antibody titers are not elevated as per protocol-specified requirements.
Genetic mutation inclusion criteria vary by cohort.

Exclusion criteria

Has a concomitant illness, autoimmune disease, chronic drug treatment, and/or cognitive delay/impairment that in the opinion of the Investigator creates unnecessary risks for gene transfer.
Exposure to gene therapy, investigational medication, or any treatment designed to increase dystrophin expression within protocol-specified time limits.
Abnormality in protocol-specified diagnostic evaluations or laboratory tests.

Other inclusion/exclusion criteria apply.