title: [Epidemiology of sarcoidosis and its genetic and environmental risk factors].
abstract: OBJECTIVE
  Review of the literature on epidemiologic data of sarcoidosis and risk factors.
  
  
  BACKGROUND
  Epidemiological data show that sarcoidosis is a world-wide disease. Frequency is influenced by multiple predisposition factors. The most important are racial factor, sex, age, familial aggregation, genetic factor and/or infective agent. One of these is insufficiency.
  
  
  CONCLUSIONS
  Patent sarcoidosis is revealed when concomitant environmental factors (infective agent, climate, country) and predisposition ones (race, sex familial aggregation) appear together and inducing, in each patient, a particular sarcoidosis.
authors.affiliation: Service de médecine interne II, CHU de la Pitié-Salpétrière, 47-83, boulevard de l'Hôpital, 75651 Paris cedex 13, France. catherine.chapelon@psl.ap-hop-paris.fr
authors.forename: C
authors.initials: C
authors.lastname: Chapelon-Abric
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D002980:Climate; D004777:Environment; D016021:Epidemiologic Studies; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D008297:Male; D008875:Middle Aged; D010375:Pedigree; D012307:Risk Factors; D012507:Sarcoidosis / Q000453:epidemiology* / Q000235:genetics*; D012737:Sex Factors