EU/3/21/2442 - orphan designation for treatment of Rett syndrome

adeno-associated virus serotype 9 expressing the cDNA for human MECP2

Overview

This medicine was designated as an orphan medicine for the treatment of Rett syndrome in the European Union on 20 May 2021.

This means that the developer will receive scientific and regulatory support from EMA to advance their medicine to the stage where they can apply for a marketing authorisation.

Orphan designation does not mean the medicine is available or authorised for use. All medicines, including designated orphan medicines, must be authorised before they can be marketed and made available to patients in the EU.

During the medicine's development, doctors may be able to enrol patients in clinical trials investigating the medicine. For information on ongoing clinical trials in the EU, see:

• EU Clinical Trials Register

• ClinicalTrials.gov

Please note that this product was withdrawn from the Union Register of orphan medicinal products in March 2022 on request of the Sponsor.

How the medicine is expected to work

Rett syndrome is caused by spontaneous mutations (changes) in the MECP2 gene and is not passed on from the parents. The MECP2 gene is important for the normal functioning of nerve cells. It is found on the X chromosome, one of the two chromosomes (X and Y) that determine a person’s sex. Rett syndrome occurs almost exclusively in girls (who have two X chromosomes), as baby boys (who have only one X chromosome) do not usually survive.

This medicine, also known as OAV201, is an adeno-associated virus 9 (AAV9) vector (carrier) for the normal human MECP2 gene. Once injected, the AAV9 vector carrying the normal form of MECP2 releases the gene into the cells. By restoring a normal copy of the MECP2 gene, this medicine is expected to restore the normal functioning of nerve cells and relieve the symptoms of patients with Rett syndrome.

The type of virus used in this medicine ('adeno-associated virus') does not cause disease in humans.

Based on description provided by sponsor

Stage of development at time of orphan designation

At the time of submission of the application for orphan designation:

• The effects of the medicine had been evaluated in experimental models.
• No clinical trials with the medicine in patients with Rett syndrome had been started.

More information on how potential new medicines are tested during their development is available on Authorisation of medicines.

About orphan designation

Medicines intended for rare diseases can be granted an orphan designation during their development.

The orphan designation allows the developer to benefit from:

• scientific and regulatory support to advance their medicine to the stage where they can request marketing authorisation;

• market exclusivity once the medicine is on the market.

To qualify for orphan designation, a medicine must meet a number of criteria:

• it must be intended for the treatment, prevention or diagnosis of a disease that is life-threatening or chronically debilitating;

• the prevalence of the condition in the EU must not be more than 5 in 10,000 or it must be unlikely that marketing of the medicine would generate sufficient returns to justify the investment needed for its development;

• there are no satisfactory alternative methods for the diagnosis, prevention or treatment of the condition or, if such a method exists, the medicine is of significant benefit to those affected by the condition.

EMA's Committee for Orphan Medicinal Products (COMP) is responsible for issuing opinions on applications for orphan designations.

The Agency sends the COMP opinion to the European Commission, which is responsible for granting the orphan designation. The full list of orphan designations is available in the Community register of orphan medicinal products for human use.

For more information, see:

• Orphan designation: Overview

• Rare diseases, orphan medicines - Getting the facts straight

Minutes of the COMP meeting 13-15 April 2021

Adopted Reference Number: EMA/COMP/222143/2021

Key facts

• Active substance:
  adeno-associated virus serotype 9 expressing the cDNA for human MECP2
• Intended use:
  Treatment of Rett syndrome
• Orphan designation status:
  Withdrawn
• EU designation number:
  EU/3/21/2442
• Date of designation:
  20/05/2021
• Sponsor:

  Novartis Gene Therapies EU Limited; Block B, The Crescent Building; Northwood; Santry; Dublin 9; Co. Dublin D09 C6X8; Ireland; Tel: [phone]; E-mail: [e-mail]