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EPIDYS

Safety and efficacy of givinostat in boys with Duchenne muscular dystrophy (EPIDYS)

Year of Publication: 2024

Authors: Mercuri E, Vilchez JJ, Boespflug-Tanguy O, ..., McDonald CM; EPIDYS Study Group

Journal: Lancet Neurology

Citation: Mercuri E et al. Lancet Neurol. 2024 Apr;23(4):393-403. DOI: 10.1016/S1474-4422(24)00036-X. PMID: 38508835. NCT02851797

Link: https://pubmed.ncbi.nlm.nih.gov/38508835/


Clinical Question

Does givinostat slow disease progression in ambulant boys with DMD on corticosteroids?

Bottom Line

Givinostat significantly slowed disease progression on four-stair climb test over 72 weeks (ratio 0.86, p=0.035) in boys with intermediate muscle fat fraction. First HDAC inhibitor to show efficacy in DMD.

Major Points

  • Vamorolone (dissociative steroid) showed comparable efficacy to prednisone with fewer side effects in DMD.
  • Prospective observational comparison: vamorolone vs standard-of-care corticosteroids.
  • NSAA and timed function tests: vamorolone non-inferior to prednisone/deflazacort.
  • Key advantage: less weight gain, less growth stunting, better bone health biomarkers.
  • Vamorolone maintains anti-inflammatory effects while reducing GR transactivation (side effects).
  • Published as part of vamorolone clinical development program (VISION-DMD).
  • Supports vamorolone as preferred corticosteroid for DMD with better safety profile.
  • FDA approved vamorolone (Agamree) for DMD in 2023.

Design

Study Type: Phase 3 randomized controlled trial

Randomization: 1

Blinding: Double-blind

Enrollment Period: June 2017 to February 2022

Follow-up Duration: 72 weeks

Centers: 41

Countries: Multiple (11 countries)

Sample Size: 179

Analysis: Modified intention-to-treat (Group A primary)


Inclusion Criteria

  • Ambulant males >=6 years
  • Genetically confirmed DMD
  • Four-stair climb <=8 seconds
  • Time-to-rise >=3 and <10 seconds
  • Corticosteroids >=6 months

Arms

FieldGivinostatControl
InterventionGivinostat oral twice daily, weight-based dosingMatching placebo oral twice daily
Duration72 weeks72 weeks

Outcomes

OutcomeTypeControlInterventionHR / OR / RRP-value
Change in four-stair climb from baseline to 72 weeks (Group A)PrimaryGeometric LSM ratio 1.48Geometric LSM ratio 1.270.035
DiarrheaAdverse11/61 (18%)43/118 (36%)
VomitingAdverse8/61 (13%)34/118 (29%)

Subgroup Analysis

Primary analysis limited to Group A (vastus lateralis fat fraction 5-30%)


Criticisms

  • Primary analysis on subgroup (Group A) rather than full ITT
  • Protocol amendment reduced dose mid-trial
  • GI side effects may have unblinded some participants
  • 359 screened to analyze only 120 patients

Funding

Italfarmaco

Based on: EPIDYS (Lancet Neurology, 2024)

Authors: Mercuri E, Vilchez JJ, Boespflug-Tanguy O, ..., McDonald CM; EPIDYS Study Group

Citation: Mercuri E et al. Lancet Neurol. 2024 Apr;23(4):393-403. DOI: 10.1016/S1474-4422(24)00036-X. PMID: 38508835. NCT02851797

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