Trial shows benefits in patients with Duchenne Muscular Dystrophy

Topline Data from Phase 3 Trial shows beneficial effect of Givinostat 

22nd June, 2022: Italfarmaco Group announced positive topline data from its completed Phase 3 EPIDYS trial with Givinostat, the company’s proprietary histone deacetylase (HDAC) inhibitor, in boys with Duchenne Muscular Dystrophy (DMD). The primary objective of the study was to evaluate the effects of Givinostat on slowing disease progression in ambulant DMD boys aged 6 years and above on chronic steroids. The study compared Givinostat to placebo and met the primary endpoint (change from baseline in the time to climb 4 stairs) following 18 months of treatment in the target population1 with key secondary endpoints consistent with the functional primary endpoint. Givinostat continued to demonstrate a tolerability profile in line with previous studies. The topline data were presented by Italfarmaco Group’s Chief Medical Officer, Dr. Paolo Bettica on June 25, 2022, at the hybrid Parent Project Muscular Dystrophy (PPMD) Annual Conference.

In October 2020, the US Food and Drug Administration (FDA) granted a Rare Pediatric Disease designation to Givinostat for the treatment of DMD. Earlier, the company also received an Orphan Drug Designation from the FDA and EMA, and a Fast Track designation from the FDA. Based on the study results, which show that the addition of Givinostat to steroid treatment leads to clinical benefits for the individuals in the study, the company plans to meet with US and EU regulators to discuss the potential for marketing application submission and seek input on a future submission of the application for regulatory approval. The company intends to submit the complete results of the EPIDYS study for publication in a peer-reviewed journal in due course.

The EPIDYS Phase 3 clinical trial is a randomised, double-blind, placebo-controlled, multicentre study evaluating the efficacy and safety of Givinostat in individuals with DMD ( NCT02851797). The trial enrolled 179 male ambulant individuals with a mean age of 9 years and on stable steroids for at least 6 months. Boys were randomised 2:1 and treated chronically with an oral suspension of Givinostat or placebo for a period of 18 months. Of these, 120 boys formed the target population1.

Overview of Clinical Results

Primary Endpoint: 

The mean change from baseline to climb 4 stairs was selected as the primary endpoint to assess the efficacy of Givinostat compared to placebo. The results demonstrated a slower decline to perform this functional task in the Givinostat-treated group (difference vs Placebo of 1.78 seconds, p=0.0345).

Key Secondary Endpoints: 

A variety of secondary endpoints were analysed that showed results consistent with the functional primary endpoint. These included functional tests such as the North Star Ambulatory Assessment (NSAA) and the time to rise (TTR) test along with muscle strength analyses. Fat infiltration in the vastus lateralis (VL) muscle of the thigh is a characteristic of disease progression in DMD patients and was measured using a non-invasive objective imaging method called Magnetic Resonance Spectroscopy (MRS) to assess the efficacy of Givinostat. The data indicated that treatment with Givinostat delayed fat infiltration by approximately 30% (difference vs Placebo, -2.9%, nominal p=0.035). Additional exploratory endpoints were also analysed in the clinical study. These results further support the potential of Givinostat in providing a clinical benefit for boys with DMD.

Safety and Tolerability: 

The majority of Adverse Events (AE) were mild to moderate in severity (95%). Three (2.5%) boys treated with Givinostat withdrew from the trial because of an AE. Similar to what had been previously observed, the AE occurring in at least 1/10 subjects were diarrhea, abdominal pain, thrombocytopenia, hypertriglyceridemia, platelet decrease and triglyceride increase. Givinostat tolerability was managed with appropriate monitoring and dose adjustments. No other safety concerns were observed.

These results show Givinostat’s beneficial effect in DMD boys providing evidence of its ability to slow down disease progression.

Prof. Eugenio Mercuri, Professor of Paediatric Neurology at the Catholic University, Rome, Italy