Study of EN-374 Gene Therapy in Participants With X-Linked Chronic Granulomatous Disease

Chronic granulomatous disease (CGD) is a rare primary immune deficiency disorder characterized by recurrent bacterial or fungal infections starting in infancy. The x-linked form of CGD (X-CGD) is caused by mutations in the CYBB gene.

EN-374 is a helper-dependent adenoviral (HDAd)-based gene therapy in development for the treatment of X-CGD using an in vivo approach, which is administered by IV infusion, to genetically modify hematopoietic stem cells (HSCs) to express a wild-type CYBB gene. The EN-374 treatment regimen includes HSC mobilization, immune prophylaxis, EN-374 administration, and enrichment of genetically modified HSCs.

Adult participants with X-CGD will be enrolled into the dose-escalation part of the study. Following completion of the adult cohorts, then pediatric participants will be enrolled into the dose-expansion part of the study in decreasing age cohorts from ≥ 12 and < 18 years of age, to ≥ 2 and < 12 years of age, and finally to ≥ 3 months and < 2 years of age.

Inclusion criteria

• Male
• ≥ 18 years of age during dose escalation, then ≥ 3 months of age during dose expansion
• Diagnosis of X-CGD with DHR+ cells ≤ 5% and a pathogenic mutation in the CYBB gene
• History of at least 1 severe infection requiring medical intervention or chronic inflammatory disorder
• Does not have a suitable, available, and willing human leukocyte antigens (HLA)-matched (10/10) related donor
• Non-sterile male participants who are or may become sexually active with female partners of childbearing potential are required to use highly effective contraception
• Informed consent, with informed assent from capable participants
• Adequate organ function

Exclusion criteria

• Active bacteremia or fungemia
• History of human immunodeficiency virus (HIV), hepatitis B, or hepatitis C
• History or clinical evidence of any medical or social issues likely to put the participant at additional risk or to interfere with study conduct
• History of HSCT or granulocyte transfusions
• Known hypersensitivity to elements in the treatment regimen
• Undergone investigational gene therapy
• Treated with another investigational drug product within 30 days before screening
• Unable to comply with the visits and requirements of the protocol as determined by the Investigator