title: Vitreous levels of erythropoietin in patients with macular oedema secondary to retinal vein occlusions: a comparative study with diabetic macular oedema.
abstract: OBJECTIVE
  In a recent study, we found high levels of erythropoietin (EPO) in patients with diabetic macular oedema (DME), suggesting a role of EPO in the pathogenesis of this condition. To investigate a possible relationship between EPO and other diseases causing macular oedema, we determined vitreous levels of this peptide in patients with macular oedema secondary to retinal vein occlusion (RVO) and compared them with levels in patients with DME and control patients.
  
  
  METHODS
  Vitreous and serum samples were obtained from patients with macular oedema secondary to RVO, DME, epiretinal membrane, and macular hole (controls). EPO was measured by radioimmunoassay.
  
  
  RESULTS
  No differences were found in median vitreous EPO levels between patients with RVO and controls: RVO, 76 mU/ml (30-806) vs controls, 25 mU/ml (10-75) (P=0.105). Median EPO concentration was higher in DME patients than in patients with RVO or controls: DME, 430 mU/ml (41-3000) vs RVO, 76 mU/ml (30-806) (P<0.0001) vs controls, 25 mU/ml (10-75) (P<0.0001).
  
  
  CONCLUSIONS
  EPO levels are not elevated in patients with macular oedema secondary to RVO. Patients with DME have high levels of EPO. These results suggest that EPO could be involved in the pathogenesis of diabetic retinopathy, but not in macular oedema secondary to RVO.
authors.affiliation: Department of Ophthalmology, Hospital Vall d' Hebron, Universidad Autónoma de Barcelona, Barcelona, Spain.
authors.forename: J
authors.initials: J
authors.lastname: García-Arumí
authors.forename: J
authors.initials: J
authors.lastname: Garcí-Arumí
authors.forename: A
authors.initials: A
authors.lastname: Fonollosa
authors.forename: C
authors.initials: C
authors.lastname: Macià
authors.forename: C
authors.initials: C
authors.lastname: Hernandez
authors.forename: V
authors.initials: V
authors.lastname: Martinez-Castillo
authors.forename: A
authors.initials: A
authors.lastname: Boixadera
authors.forename: M A
authors.initials: MA
authors.lastname: Zapata
authors.forename: R
authors.initials: R
authors.lastname: Simo
mesh_terms: D000368:Aged; D015415:Biomarkers / Q000097:blood / Q000378:metabolism; D003930:Diabetic Retinopathy / Q000097:blood / Q000378:metabolism*; D004921:Erythropoietin / Q000097:blood / Q000378:metabolism*; D005260:Female; D006801:Humans; D008269:Macular Edema / Q000097:blood / Q000209:etiology / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D011863:Radioimmunoassay; D012170:Retinal Vein Occlusion / Q000097:blood / Q000150:complications*; D014822:Vitreous Body / Q000378:metabolism*
chemical_list: D015415:Biomarkers; D004921:Erythropoietin