sábado, 1 de julio de 2017

Prevalence of fibrodysplasia ossificans progressiva (FOP) in France: an estimate based on a record linkage of two national databases | Orphanet Journal of Rare Diseases | Full Text

Prevalence of fibrodysplasia ossificans progressiva (FOP) in France: an estimate based on a record linkage of two national databases | Orphanet Journal of Rare Diseases | Full Text

Biomed Central

Orphanet Journal of Rare Diseases

Prevalence of fibrodysplasia ossificans progressiva (FOP) in France: an estimate based on a record linkage of two national databases

  • Geneviève Baujat,
  • Rémy Choquet,
  • Stéphane BouéeEmail author,
  • Viviane Jeanbat,
  • Laurène Courouve,
  • Amélie Ruel,
  • Caroline Michot,
  • Kim-Hanh Le Quan Sang,
  • David Lapidus,
  • Claude Messiaen,
  • Paul Landais and
  • Valérie Cormier-Daire
Orphanet Journal of Rare Diseases201712:123
DOI: 10.1186/s13023-017-0674-5
Received: 11 April 2017
Accepted: 14 June 2017
Published: 30 June 2017

Abstract

Background

Fibrodysplasia ossificans progressiva (FOP) is a rare, severely disabling, and life-shortening genetic disorder that causes the formation of heterotopic bone within soft connective tissue. Previous studies found that the FOP prevalence was about one in every two million lives. The aim of this study is to estimate the FOP prevalence in France by probabilistic record-linkage of 2 national databases: 1) the PMSI (Programme de médicalisation des systèmes d’information), an administrative database that records all hospitalization activities in France and 2) CEMARA, a registry database developed by the French Centres of Reference for Rare Diseases.

Results

Using a capture-recapture methodology to adjust the crude number of patients identified in both data sources, 89 FOP patients were identified, which results in a prevalence of 1.36 per million inhabitants (CI95% = [1.10; 1.68]). FOP patients’ mean age was 25 years, only 14.9% were above 40 years, and 53% of them were males. The first symptoms – beside toe malformations- occurred after birth for 97.3% of them. Mean age at identified symptoms was 7 years and above 18 years for only 6.9% of patients. Mean age at diagnosis was 10 years, and above 18 years for 14.9% of the patients. FOP patients were distributed across France.

Conclusions

Despite the challenge of ascertaining patients with rare diseases, we report a much higher prevalence of FOP in France than in previous studies elsewhere. We suggest that efforts to identify patients and confirm the diagnosis of FOP should be reinforced and extended at both national and European level.

Keywords

Fibrodysplasia ossificans progressiva Epidemiology Prevalence Data bases Rare genetic diseases

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