[Epidemiology of genetic hemoglobin diseases in metropolitan France].

The number of subjects with heterozygous beta-thalassaemia and sickle-cell anaemia in metropolitan France can be evaluated by the distribution of populations originating from countries with a high prevalence of genetic haemoglobinopathies. Taking into account the movements of these populations observed since the 1982 census, the current prevalences of beta-thalassaemic and drepanocytic traits are higher than the figures of 180,000 and 130,000 respectively found at that date. On the other hand, it appears from episodic screenings performed during the last few years that the percentage of subjects with heterozygous beta-thalassaemia is 3.09% in Corsica, 0.77% in school-age population in the Marseille area, and 0.72% in the general population of Marseille, Toulon and Nice. In 1992, the number of patients with heterozygous beta-thalassaemia and with major sickle-cell syndrome is estimated at 250-350 and 1000-3000 respectively. Patients with sickle-cell anemia predominate in the Paris area, whereas those with heterozygous beta-thalassemia predominate in the provinces, notably in the Provence-Côte d'Azur and Corsica regions.