Alpha Mannosidosis

The purpose of this study is to understand the course of rare genetic disorders that affect the brain. This data is being analyzed to gain a better understanding of the progression of the rare neurodegenerative disorders and the effects of interventions.

The primary objective of the study is to determine the safety and feasibility of intrathecal administration of DUOC-01 as an adjunctive therapy in patients with inborn errors of metabolism who have evidence of early demyelinating disease in the central nervous system (CNS) who are undergoing standard treatment with unrelated umbilical cord blood transplantation (UCBT). The secondary objective of the study is to describe the efficacy of UCBT with intrathecal administration of DUOC-01 in these patients.

The goal of this observational study is to learn the effects of the drug velmanase alfa (Lamzede®) in the bodies of children under the age of 3 with Alpha-Mannosidosis. The main questions it aims to answer are: * study the effect of velmanase alfa on a marker of the disease called GlcNAc(Man)2 after one year of therapy * explore how the child's body reacts to velmanase alfa during the therapy The parents or legal guardians of participants will be asked to provide the results of analyses performed in the routine clinical setting related to the participant's general health and the administration of velmanase alfa. Additional data will be extracted from other observational sponsored studies/registries, compassionate use programs, investigator-initiated studies (IIS), and published case reports (presented in the literature) if existing.

Individual patient expanded access requests may be considered for patients who have no other treatment options.