Treatment of Fabry's Disease with the Pharmacologic Chaperone Migalastat

Dominique P Germain, Derralynn A Hughes, Kathleen Nicholls, Daniel G Bichet, Roberto Giugliani, William R Wilcox, Claudio Feliciani, Suma P Shankar, Fatih Ezgu, Hernan Amartino, Drago Bratkovic, Ulla Feldt-Rasmussen, Khan Nedd, Usama Sharaf El Din, Charles M Lourenço, Maryam Banikazemi, Joel Charrow, Majed Dasouki, David Finegold, Pilar GiraldoOzlem Goker-Alpan, Nicola Longo, C Ronald Scott, Roser Torra, Ahmad Tuffaha, Ana Jovanovic, Stephen Waldek, Seymour Packman, Elizabeth Ludington, Christopher Viereck, John Kirk, Julie Yu, Elfrida R Benjamin, Franklin Johnson, David J Lockhart, Nina Skuban, Jeff Castelli, Jay Barth, Carrolee Barlow, Raphael Schiffmann

195 Citations (Scopus)

Abstract

BACKGROUND: Fabry's disease, an X-linked disorder of lysosomal α-galactosidase deficiency, leads to substrate accumulation in multiple organs. Migalastat, an oral pharmacologic chaperone, stabilizes specific mutant forms of α-galactosidase, increasing enzyme trafficking to lysosomes. METHODS: The initial assay of mutant α-galactosidase forms that we used to categorize 67 patients with Fabry's disease for randomization to 6 months of double-blind migalastat or placebo (stage 1), followed by open-label migalastat from 6 to 12 months (stage 2) plus an additional year, had certain limitations. Before unblinding, a new, validated assay showed that 50 of the 67 participants had mutant α-galactosidase forms suitable for targeting by migalastat. The primary end point was the percentage of patients who had a response (≥50% reduction in the number of globotriaosylceramide inclusions per kidney interstitial capillary) at 6 months. We assessed safety along with disease substrates and renal, cardiovascular, and patient-reported outcomes. RESULTS: The primary end-point analysis, involving patients with mutant α-galactosidase forms that were suitable or not suitable for migalastat therapy, did not show a significant treatment effect: 13 of 32 patients (41%) who received migalastat and 9 of 32 patients (28%) who received placebo had a response at 6 months (P=0.30). Among patients with suitable mutant α-galactosidase who received migalastat for up to 24 months, the annualized changes from baseline in the estimated glomerular filtration rate (GFR) and measured GFR were -0.30±0.66 and -1.51±1.33 ml per minute per 1.73 m2 of body-surface area, respectively. The left-ventricular-mass index decreased significantly from baseline (-7.7 g per square meter; 95% confidence interval [CI], -15.4 to -0.01), particularly when left ventricular hypertrophy was present (-18.6 g per square meter; 95% CI, -38.2 to 1.0). The severity of diarrhea, reflux, and indigestion decreased. CONCLUSIONS: Among all randomly assigned patients (with mutant α-galactosidase forms that were suitable or not suitable for migalastat therapy), the percentage of patients who had a response at 6 months did not differ significantly between the migalastat group and the placebo group.

Original languageEnglish
JournalNew England Journal of Medicine
Volume375
Issue number6
Pages (from-to)545-555
Number of pages11
ISSN0028-4793
DOIs
Publication statusPublished - 11 Aug 2016

Keywords

  • 1-Deoxynojirimycin
  • Adolescent
  • Adult
  • Aged
  • Diarrhea
  • Double-Blind Method
  • Fabry Disease
  • Female
  • Glomerular Filtration Rate
  • Heart Ventricles
  • Humans
  • Hypertrophy, Left Ventricular
  • Kidney
  • Male
  • Middle Aged
  • Mutation
  • Trihexosylceramides
  • Ultrasonography
  • Young Adult
  • alpha-Galactosidase
  • Clinical Trial, Phase III
  • Journal Article
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

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