title: Erythropoietic protoporphyria: spectrum of three cases.
abstract: BACKGROUND
  Erythropoietic protoporphyria is a rare photodermatosis of childhood, and the diagnosis can be delayed. A deficient ferrochelatase enzyme leads to accumulation of protoporphyrins in the dermis, causing phototoxic burning.
  
  
  OBJECTIVE
  To report three cases with great variability in severity of symptoms and age at diagnosis. We discuss clinical and biochemical findings, mutation analysis, and therapeutic options.
  
  
  METHODS
  We report three cases with different degrees of photosensitivity, laboratory results, psychosocial impact, and preventive and therapeutic treatments.
  
  
  RESULTS
  The diagnosis of erythropoietic protoporphyria was confirmed by both typical elevation of plasma porphyrins and the discovery of a mutated FECH gene.
  
  
  CONCLUSIONS
  Erythropoietic protoporphyria should be suspected in any cases of childhood photosensitivity. Systemic complications are unusual. Mutation analysis confirms the diagnosis. Photoprotection is the cornerstone of treatment.
authors.affiliation: Department of Medicine, Universite de Montreal, Montreal, Canada. janie.bertrand@usherbrooke.ca
authors.forename: Janie
authors.initials: J
authors.lastname: Bertrand
authors.forename: Joe T R
authors.initials: JT
authors.lastname: Clarke
authors.forename: Dominique
authors.initials: D
authors.lastname: Hanna
mesh_terms: D000293:Adolescent; D000328:Adult; D002675:Child, Preschool; D004252:DNA Mutational Analysis; D003937:Diagnosis, Differential; D005260:Female; D005294:Ferrochelatase / Q000097:blood / Q000235:genetics*; D006801:Humans; D008297:Male; D009154:Mutation; D010641:Phenotype; D011166:Porphyrins / Q000097:blood; D046351:Protoporphyria, Erythropoietic / Q000097:blood / Q000175:diagnosis* / Q000235:genetics
chemical_list: D011166:Porphyrins; D005294:Ferrochelatase