OTL-200 (MLD)

About MLD

Metachromatic leukodystrophy (MLD) is a rare and life-threatening inherited disease of the body’s metabolic system. MLD is caused by a mutation in the arylsulfatase-A (ARSA) gene that results in the accumulation of fats called sulfatides in the brain and other areas of the body, leading to loss of sensory, motor and cognitive function.

For more information about MLD, click here.

About OTL-200/ Libmeldy™ (EU, UK, Iceland, Liechtenstein and Norway)

OTL-200 (autologous CD34+ cell enriched population that contains hematopoietic stem and progenitor cells (HSPC) transduced ex vivo using a lentiviral vector encoding the human arylsulfatase-A (ARSA) gene), referred to as Libmeldy in the European Union, is an ex vivo autologous hematopoietic stem cell gene therapy approved by the European Medicines Agency (EMA) in 2020 and is currently the only approved treatment for MLD. OTL-200 is an investigational therapy which has not been approved by the U.S. Food and Drug Administration (FDA) or any other health authority.  

In the EU, Libmeldy is indicated for the treatment of patients with metachromatic leukodystrophy (MLD), characterized by biallelic mutations in the ARSA gene leading to a reduction of the ARSA enzymatic activity in children with i) late infantile or early juvenile forms, without clinical manifestations of the disease, or ii) the early juvenile form, with early clinical manifestations of the disease, who still have the ability to walk independently and before the onset of cognitive decline.

OTL-200 was developed in partnership with the San Raffaele-Telethon Institute for Gene Therapy (SR-Tiget) in Milan, Italy.

The most common adverse reaction attributed to treatment with Libmeldy was the occurrence of anti-ARSA antibodies (AAA). In addition to the risks associated with the gene therapy, treatment with OTL-200 is preceded by other medical interventions, namely bone marrow harvest or peripheral blood mobilization and apheresis, followed by myeloablative conditioning, which carry their own risks. During the clinical studies, the safety profiles of these interventions were consistent with their known safety and tolerability.

For more information about Libmeldy, please see the EU Summary of Product Characteristics available on the EMA website.

OTL-203 (MPS-I)

About MPS-I

Mucopolysaccharidosis type I (MPS-I) is a rare, inherited neurometabolic disease caused by a deficiency of the alpha-L-iduronidase (IDUA) lysosomal enzyme, which is required to break down sugar molecules called glycosaminoglycans (also known as GAGs). The accumulation of GAGs across multiple organ systems results in symptoms including neurocognitive impairment, skeletal deformity, loss of vision and hearing, and cardiovascular and pulmonary complications.

For more information about MPS-I, click here.

About OTL-203

OTL-203 is an ex vivo autologous gene therapy being investigated for the treatment of MPS-I. It uses a modified virus to insert a functional copy of the IDUA gene into a patient’s cells. OTL-203 is being developed in partnership with the San Raffaele-Telethon Institute for Gene Therapy (SR-Tiget) in Milan, Italy. OTL-203 has received rare pediatric disease designation from the FDA. Through an ongoing proof-of-concept clinical trial, OTL-203 is being evaluated as a potential treatment for patients with the most severe form of MPS-I, known as Hurler syndrome.

OTL-203 is an investigational therapy and has not been approved by any regulatory agency or health authority.

OTL-201 (MPS-IIIA)

About MPS-IIIA

Mucopolysaccharidosis type IIIA (MPS-IIIA, also known as Sanfilippo syndrome type A) is a rare, life-threatening neurometabolic disease characterized by intellectual disability and loss of motor function. It is caused by a mutation in the N-sulphoglucosamine sulphohydrolase (SGSH) gene, resulting in the buildup of sugar molecules called mucopolysaccharides in the brain and other tissues. There are currently no approved treatment options for MPS-IIIA.

For more information about MPS-IIIA, click here.

About OTL-201

OTL-201 is an ex vivo autologous gene therapy being developed for the treatment of MPS-IIIA. It uses a modified virus to insert a functional copy of the SGSH gene into a patient’s cells. OTL-201 has received rare pediatric disease designation from the FDA and is currently being evaluated in an ongoing proof-of-concept clinical trial.

OTL-201 is an investigational therapy and has not been approved by any regulatory agency or health authority.

OTL-103 (WAS)

About WAS

Wiskott Aldrich syndrome (WAS) is a life-threatening inherited immune disorder characterized by recurrent and severe infections, autoimmunity, eczema and severe bleeding episodes. It is caused by a mutation in the gene that produces the Wiskott Aldrich syndrome protein, which results in abnormal function of white blood cells and low platelets.

For more information about WAS, click here.

About OTL-103

OTL-103 is an ex vivo autologous gene therapy being investigated for the treatment of WAS. It uses a modified virus to insert a working copy of the WAS gene into a patient’s cells. OTL-103 is being developed in partnership with the San Raffaele-Telethon Institute for Gene Therapy (SR-Tiget) in Milan, Italy. It has received rare pediatric disease designation and Regenerative Medicine Advanced Therapy (RMAT) designation from the FDA. Orchard is conducting ongoing clinical trials of OTL-103 for the treatment of WAS.

OTL-103 is an investigational therapy and has not been approved by any regulatory agency or health authority.