This is a multicenter, open-label study to assess the safety, tolerability, PK, PD, and efficacy of Nizubaglustat in male or female patients with late-infantile or juvenile onset GM2 gangliosidosis or NPC disease in two cohorts:
- Cohort 1: Patients who previously took part in Phase 2 Study AZA-001-5A2-01 (RAINBOW) and wish to continue in this open-label study
- Cohort 2: Approximately 10 patients with NPC disease, aged ≥12 years who received full-dose Miglustat for more than 12 months, have stable or worsening disease over the 2 previous clinic visits, and who wish to stop Miglustat treatment and transition to Nizubaglustat.