More than 7,000 rare diseases have been identified, of which more than 80% of genetic origin. Cystic fibrosis, Ménière's disease, Huntington's disease and Charcot's disease are among the best known.

In France, they concern more than 3 million people if we take into account the entourage of the sick person, or 4.5% of the population. The plan as a whole will only be revealed in the “first half of the year”, the minister said on Thursday.