title: Changes in plasma and urine globotriaosylceramide levels do not predict Fabry disease progression over 1 year of agalsidase alfa.
abstract: OBJECTIVE
  Globotriaosylceramide concentrations were assessed as potential predictors of change from baseline after 12 months by estimated glomerular filtration rate and left-ventricular mass index using pooled data from three randomized, placebo-controlled agalsidase alfa trials and open-label extensions of patients with Fabry disease.
  
  
  METHODS
  Males (aged 18 years or older) with Fabry disease received agalsidase alfa (0.2 mg/kg every other week for 12 months). A backward-elimination approach evaluated potential predictors (baseline estimated glomerular filtration rate and left-ventricular mass index; age at first dose; baseline and change from baseline at 12 months of globotriaosylceramide (urine, plasma); urine protein excretion; and systolic and diastolic blood pressure). Subgroups included patients randomized to placebo or agalsidase alfa (double-blind phase), then to agalsidase alfa (open-label extensions; placebo→agalsidase alfa or agalsidase alfa→agalsidase alfa, respectively) and stage 2/3 chronic kidney disease patients.
  
  
  RESULTS
  Baseline estimated glomerular filtration rate, age at first dose, baseline urine globotriaosylceramide excretion, and baseline and change from baseline urine protein excretion significantly predicted change from baseline estimated glomerular filtration rate in the analysis population (N = 73; all P<0.05), although not in all subgroups. Change from baseline urine and plasma globotriaosylceramide (baseline and change from baseline) concentrations did not predict change from baseline estimated glomerular filtration rate. No predictors of left-ventricular mass index were significant.
  
  
  CONCLUSIONS
  Changes in globotriaosylceramide concentrations do not appear to be useful biomarkers for prediction of Fabry disease-related changes in estimated glomerular filtration rate or left-ventricular mass index.
authors.affiliation: Institute of Metabolic Disease, Baylor Research Institute, Dallas, Texas, USA.
authors.forename: Raphael
authors.initials: R
authors.lastname: Schiffmann
authors.forename: Markus
authors.initials: M
authors.lastname: Ries
authors.forename: Derek
authors.initials: D
authors.lastname: Blankenship
authors.forename: Kathy
authors.initials: K
authors.lastname: Nicholls
authors.forename: Atul
authors.initials: A
authors.lastname: Mehta
authors.forename: Joe T R
authors.initials: JT
authors.lastname: Clarke
authors.forename: Robert D
authors.initials: RD
authors.lastname: Steiner
authors.forename: Michael
authors.initials: M
authors.lastname: Beck
authors.forename: Bruce A
authors.initials: BA
authors.lastname: Barshop
authors.forename: William
authors.initials: W
authors.lastname: Rhead
authors.forename: Michael
authors.initials: M
authors.lastname: West
authors.forename: Rick
authors.initials: R
authors.lastname: Martin
authors.forename: David
authors.initials: D
authors.lastname: Amato
authors.forename: Nitin
authors.initials: N
authors.lastname: Nair
authors.forename: Pedro
authors.initials: P
authors.lastname: Huertas
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000097:blood / Q000652:urine; D018450:Disease Progression; D004311:Double-Blind Method; D000795:Fabry Disease / Q000150:complications / Q000188:drug therapy* / Q000473:pathology / Q000503:physiopathology*; D005919:Glomerular Filtration Rate; D006352:Heart Ventricles / Q000473:pathology; D006801:Humans; D007527:Isoenzymes / Q000008:administration & dosage / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D011994:Recombinant Proteins; D051436:Renal Insufficiency, Chronic / Q000209:etiology / Q000503:physiopathology; D016896:Treatment Outcome; D014281:Trihexosylceramides / Q000097:blood* / Q000652:urine*; D055815:Young Adult; D000519:alpha-Galactosidase / Q000008:administration & dosage / Q000627:therapeutic use*
chemical_list: D015415:Biomarkers; D007527:Isoenzymes; D011994:Recombinant Proteins; D014281:Trihexosylceramides; C000627036:agalsidase alfa; C018549:globotriaosylceramide; D000519:alpha-Galactosidase