A Study to Evaluate the Safety and Efficacy of Oral Nizubaglustat (AZ-3102) in Late-infantile and Juvenile Forms of Niemann-Pick Type C Disease, GM1 Gangliosidosis or GM2 Gangliosidosis

This is a Phase 3 randomized, double-blinded, placebo-controlled study that will evaluate the safety and efficacy of oral nizubaglustat (AZ-3102) in multiple disease areas using a Master Protocol Research Program. Participants are randomized to different subprotocols based on disease type: Niemann-Pick type C (NPC), GM1 gangliosidosis or GM2 gangliosidosis.

Treatment specific procedures will be described in the disease-specific subprotocol. Individual subprotocols may have additional eligibility requirements, safety and efficacy procedures, or endpoints, which will be described in the corresponding subprotocols.

For information specific to each individual subprotocol included in this trial, please refer to the corresponding, separate, clinicaltrials.gov records: Niemann-Pick type C disease NCT07082725 (Recruiting) and GM1 gangliosidosis or GM2 gangliosidosis NCT07082543 (Active, not recruiting - No longer looking for participants) .

• AZ-3102 (Drug), also known as nizubaglustat: Oral dispersible tablets
• Placebo (Drug): A matching placebo will be administered in the same regimen as the intervention

Primary outcomes

• Number of participants allocated to subprotocol AZA-001-301-NPC [Baseline to month 18]
• Number of participants allocated to subprotocol AZA-001-301-GMx [Baseline to month 18]

Sex: All, ages: 4 Years to any

Inclusion Criteria:

* Male and female participants, aged 4 years and older with a diagnosis of the late-infantile or juvenile form of NPC disease. Detailed inclusion criteria are presented in the NPC disease-specific subprotocol AZA-001-301-NPC (NCT07082725).
* Male and female participants, aged 4 years and older with a diagnosis of GM1 or GM2 (Tay-Sachs, Sandhoff, or GM2AB variant disease) gangliosidosis of late-infantile/ juvenile onset. Detailed inclusion criteria are presented in the GM1/GM2 gangliosidosis-specific subprotocol AZA-001-301-GMx (NCT07082543).

Exclusion Criteria:

* Detailed exclusion criteria are presented in the NPC disease-specific subprotocol AZA-001-301-NPC
* Detailed exclusion criteria are presented in the GM1/GM2 gangliosidosis-specific subprotocol AZA-001-301-GMx