title: Low glycosylated ferritin, a good marker for the diagnosis of hemophagocytic syndrome.
abstract: OBJECTIVE
  A very low percentage of glycosylated ferritin (<20%) has only been reported in association with adult-onset Still's disease (AOSD), a disease classically associated with hemophagocytic syndrome. We undertook this study to determine whether hemophagocytic syndrome outside the context of AOSD is also associated with a very low percentage of glycosylated ferritin.
  
  
  METHODS
  From October 2006 to September 2007, the serum level of glycosylated ferritin was determined in all consecutive patients seen in 3 departments and for whom the diagnosis of hemophagocytic syndrome was suspected. The level of glycosylated ferritin in these patients was compared with that in age- and sex-matched controls with a marked inflammatory syndrome not associated with hemophagocytic syndrome. We assessed the value of glycosylated ferritin as a marker for the diagnosis of hemophagocytic syndrome.
  
  
  RESULTS
  Forty-two patients were included in the study (14 with confirmed hemophagocytic syndrome, 7 with suspected but unconfirmed hemophagocytic syndrome, and 21 controls). The median level (interquartile range [IQR]) of total serum ferritin was significantly higher in patients with confirmed hemophagocytic syndrome (3,344 microg/liter [2,074-7,334]) than in patients with suspected but unconfirmed hemophagocytic syndrome (555 microg/liter [464-1,420]) (P = 0.02) or in controls (451 microg/liter [126-929]) (P < 0.001). The median (IQR) percentage of glycosylated ferritin was significantly lower in patients with confirmed hemophagocytic syndrome (10% [3-14]) than in patients with suspected but unconfirmed hemophagocytic syndrome (40% [36-47]) (P < 0.001) or in controls (36% [26-49]) (P < 0.001). The diagnostic performance of glycosylated ferritin tended to be higher than that of total serum ferritin for the diagnosis of hemophagocytic syndrome (area under the receiver operating characteristic curve [95% confidence interval] 0.97 [0.92-1.00] versus 0.79 [0.59-1.00]; P = 0.10).
  
  
  CONCLUSIONS
  These results suggest that glycosylated ferritin may be a helpful marker for the diagnosis of hemophagocytic syndrome.
authors.affiliation: Department of Internal Medicine, Hôpital Saint-Antoine, Paris, France. laurence.fardet@sat.aphp.fr
authors.forename: Laurence
authors.initials: L
authors.lastname: Fardet
authors.forename: Paul
authors.initials: P
authors.lastname: Coppo
authors.forename: Adrien
authors.initials: A
authors.lastname: Kettaneh
authors.forename: Monique
authors.initials: M
authors.lastname: Dehoux
authors.forename: Jean
authors.initials: J
authors.lastname: Cabane
authors.forename: Olivier
authors.initials: O
authors.lastname: Lambotte
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers / Q000097:blood; D005260:Female; D005293:Ferritins / Q000097:blood*; D006801:Humans; D051359:Lymphohistiocytosis, Hemophagocytic / Q000097:blood* / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D006023:Glycoproteins
chemical_list: D015415:Biomarkers; D005293:Ferritins; C051036:glycosylated ferritin; D006023:Glycoproteins