EU/3/12/985

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Orphan designation

On 26 April 2012, orphan designation (EU/3/12/985) was granted by the European Commission to ProRetina Therapeutics S.L., Spain, for recombinant human methionine proinsulin for the treatment of retinitis pigmentosa.

What is retinitis pigmentosa?

Retinitis pigmentosa is a group of hereditary diseases of the eye that lead to progressive loss of sight. In patients with retinitis pigmentosa, cells in the retina (the light-sensitive surface at the back of the eye) become damaged and eventually die.

Retinitis pigmentosa is a long-term debilitating disease because it causes the patient’s sight to get worse, eventually leading to blindness.

What is the estimated number of patients affected by this condition?

At the time of designation, retinitis pigmentosa affected less than 3.7 in 10,000 people in the European Union (EU)*. This is equivalent to a total of fewer than 187,000 people, and is below the ceiling for orphan designation, which is 5 people in 10,000. This is based on the information provided by the sponsor and the knowledge of the Committee for Orphan Medicinal Products (COMP).

*Disclaimer: For the purpose of the designation, the number of patients affected by the condition is estimated and assessed on the basis of data from the European Union (EU 27), Norway, Iceland and Liechtenstein. This represents a population of 506,300,000 (Eurostat 2011).

What treatments are available?

At the time of designation, no satisfactory methods were authorised in the EU for treating retinitis pigmentosa. Patients with the condition were given sunglasses to slow down the damage to the retina, genetic counselling (discussion of the risks of passing the condition on to children) and general support.

How is this medicine expected to work?

This medicine contains the protein proinsulin, which in the body is normally converted to insulin, the hormone that controls the levels of glucose (sugar) in blood. When injected into the eye of patients with retinitis pigmentosa, proinsulin is thought to reduce the death of retina cells. This is expected to slow down and prevent the loss of retina cells in these patients.

The medicine is produced by a method known as ‘recombinant DNA technology’: it is made by bacteria that have received a gene (DNA), which makes them able to produce proinsulin.

What is the stage of development of this medicine?

At the time of submission of the application for orphan designation, the evaluation of the effects of the medicine in experimental models was ongoing.

At the time of submission, no clinical trials with the medicine in patients with retinitis pigmentosa had been started.

At the time of submission, recombinant human methionine proinsulin was not authorised anywhere in the EU for retinitis pigmentosa or designated as an orphan medicinal product elsewhere for this condition.

In accordance with Regulation (EC) No 141/2000 of 16 December 1999, the COMP adopted a positive opinion on 8 March 2012 recommending the granting of this designation.

Opinions on orphan medicinal product designations are based on the following three criteria:
  • the seriousness of the condition;
  • the existence of alternative methods of diagnosis, prevention or treatment;
  • either the rarity of the condition (affecting not more than 5 in 10,000 people in the EU) or insufficient returns on investment.

Designated orphan medicinal products are products that are still under investigation and are considered for orphan designation on the basis of potential activity. An orphan designation is not a marketing authorisation. As a consequence, demonstration of quality, safety and efficacy is necessary before a product can be granted a marketing authorisation.

Key facts

Product details for <p>Recombinant human methionine proinsulin</p>
Active substanceRecombinant human methionine proinsulin
Medicine Name
Disease/conditionTreatment of retinitis pigmentosa
Date of decision26/04/2012
OutcomePositive
Orphan decision numberEU/3/12/985

Review of designation

The Committee for Orphan Medicinal Products reviews the orphan designation of a product if it is approved for marketing authorisation.

Sponsor’s contact details:

ProRetina Therapeutics, S.L.
Plaza Cein, 5
Despacho T5
31110 Noáin (Navarra)
Spain
Telephone: +34 94 83 17 345
Telefax: +34 94 83 16 858
E-mail: info@proretina.com

Patients' organisations:

For contact details of patients’ organisations whose activities are targeted at rare diseases see:

  • Orphanet, a database containing information on rare diseases which includes a directory of patients’ organisations registered in Europe.
  • European Organisation for Rare Diseases (EURORDIS), a non-governmental alliance of patient organisations and individuals active in the field of rare diseases.