EU/3/14/1249

Familial chylomicronaemia syndrome (also known as type I hyperlipoproteinaemia) is an inherited disease where patients have abnormally high levels of some types of fat called triglycerides in their blood. The excess fat accumulates in organs such as the spleen and liver, which become abnormally enlarged. Fat accumulation can also cause repeated bouts of pancreatitis (inflammation of the pancreas) and xanthomas (formation of yellow fatty deposits just under the skin, generally around joints).

The cause of the disease is often the body's failure to produce enough of an enzyme called lipoprotein lipase, which is involved in breaking down fats from the diet.

Familial chylomicronaemia syndrome is a debilitating and life threatening disease because the bouts of pancreatitis can be severe and sometimes fatal.

At the time of designation, familial chylomicronaemia syndrome affected less than 0.1 in 10,000 people in the European Union (EU). This was equivalent to a total of fewer than 5,000 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 28), Norway, Iceland and Liechtenstein. This represents a population of 511,100,000 (Eurostat 2014).

At the time of designation, the medicine Glybera (alipogene tiparvovec) was authorised for the treatment of lipoproteinlipase deficiency in patients who suffer from multiple episodes of pancreatitis despite fat dietary restrictions (avoiding foods that contain a high level of fat). Patients were also advised to avoid the use of substances known to increase the level of triglycerides in the blood, such as alcohol, diuretics or oestrogens.

The sponsor has provided sufficient information to show that the medicine might be of significant benefit for patients with familial chylomicronaemia syndrome because early studies suggest that the medicine works in a different way to existing treatment and it may benefit a wider population. This assumption will need to be confirmed at the time of marketing authorisation, in order to maintain the orphan status.

This medicine is an 'antisense oligonucleotide', a very short piece of synthetic RNA (a type of genetic material). It has been designed to block the production of a protein called apolipoprotein C-III, which when found at high levels in the blood is thought to prevent the breaking down of fats in the blood. By blocking the production of this protein, the medicine is expected to reduce fat accumulation in the various organs and the number of pancreatitis attacks, thus reducing the severity of the disease.

The effects of the medicine have been evaluated in experimental models.

At the time of submission of the application for orphan designation, clinical trials with the medicine in patients with familial chylomicronaemia syndrome were ongoing.

At the time of submission, the medicine was not authorised anywhere in the EU for familial chylomicronaemia syndrome 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 9 January 2014 recommending the granting of this designation.

• 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.