CONCORD, Mass., Aug. 25, 2025 /PRNewswire/ -- ITF Therapeutics LLC, the US affiliate of Italfarmaco, today announced publication of positive long-term safety and efficacy data for givinostat as a treatment for Duchenne muscular dystrophy (DMD) from the company's open-label extensions of its Phase 2 and Phase 3 (EPIDYS) trials.

The results, published in Annals of Clinical and Translational Neurology, show that long-term treatment with givinostat, a novel histone deacetylase (HDAC) inhibitor, in combination with corticosteroids, delayed disease progression in ambulant patients aged six years and older with DMD. Importantly, clinical benefit was observed across treatment groups receiving givinostat, with positive impact on key mobility functions such as rising from the floor, climbing stairs, and the ability to walk (ambulation). Givinostat has received marketing authorization in the US, EU and UK.

"These data represent an important step in building a robust body of evidence for the long-term use of givinostat in DMD," said Paolo Bettica, MD, PhD, Chief Medical Officer at Italfarmaco. "The sustained benefit observed across functional outcomes reinforces the potential of givinostat to meaningfully alter the course of the disease. With its well-established safety profile and ease of administration, givinostat continues to emerge as a valuable treatment option for patients affected by DMD and their families."

The study included multiple cohorts of boys with DMD all of whom received givinostat over various durations. Some had previously taken part in the Phase 2 or Phase 3 EPIDYS studies, either on active treatment or placebo, before entering the extension study. Others enrolled directly into the extension study after meeting eligibility criteria while not participating in the main trial. The total treatment exposure for some patients exceeded eight years.

Using propensity matching methods, 142 patients receiving givinostat and 142 from the natural history cohort were included in the analyses. In individuals who began treatment with givinostat in EPIDYS or the long-term extension study, patients treated with givinostat experienced a delay in disease progression compared to the matched natural history cohort. The data suggest that givinostat may delay the loss of the ability to rise from the floor by a median of 2.0 years, loss of the ability to climb four stairs (4SC) by 3.3 years, and loss of the ability to walk by 2.9 years. These findings further support the potential of givinostat to provide clinical benefit to patients with DMD. Givinostat was generally well-tolerated across all cohorts in this open-label extension study, and no new safety signals emerged during long-term treatment.

"For patients and families affected by Duchenne, maintaining motor function for as long as possible can mean more independence, more participation, and more time doing everyday activities that matter," said Scott Baver, PhD, Vice President, Medical Affairs at ITF Therapeutics. "Our new long-term data further reinforce the potential of our treatment option to make a real difference for patients."

"These new findings show that treatment with givinostat continues to have a positive impact by addressing symptoms that patients are most concerned about, and that these long-term benefits are achieved over several years while treatment remains safe and tolerable," added Craig M. McDonald, Chair, Department of Physical Medicine & Rehabilitation, Professor, Departments of Pediatrics and Physical Medicine & Rehabilitation, University of California Davis Health.

Duvyzat was approved by the US Food and Drug Administration (FDA) in March 2024 for the treatment of DMD patients six years and older. The European Commission (EC) also granted Duvyzat conditional marketing authorisation in the EU in June 2025 for ambulant DMD patients 6 years and older. In December 2024, the UK's Medicines and Healthcare products Regulatory Agency (MHRA) approved Duvyzat for patients aged six years and older who are ambulatory and granted conditional marketing approval for non-ambulatory patients.

Indication

What is DUVYZAT?

DUVYZAT is a prescription medicine for the treatment of Duchenne muscular dystrophy (DMD) in people 6 years of age and older. It is not known if DUVYZAT is safe and effective in children under age 6.

Important Safety Information

What is the most important information I should know about DUVYZAT?

• Low platelet counts in your blood (thrombocytopenia). Platelets are important for blood clotting, so having fewer can increase your risk of bleeding or bruising. Your doctor will check your blood count before you start DUVYZAT and regularly during treatment for signs of thrombocytopenia. Call your doctor right away if you notice unusual bleeding or small red or purple spots on the skin.
• Increased levels of fat (triglycerides) in your blood. You may not have any symptoms, so your doctor will do blood tests before you start DUVYZAT and regularly during treatment to check your triglyceride levels.
• Frequent watery loose stools (diarrhea) and vomiting. DUVYZAT can cause vomiting and moderate to severe diarrhea. If diarrhea occurs, you should keep track of the frequency and severity of your symptoms, drink plenty of fluids, and contact your doctor.
• If thrombocytopenia, increased triglycerides, or diarrhea cannot be managed, your doctor may change your dose or stop your treatment with DUVYZAT, if needed.

Before taking DUVYZAT, tell your doctor about all of your medical conditions, including:

• any heart problems or medicines you take that could increase your chance for irregular heart rhythms.
• any bleeding problems.

What are the possible side effects of DUVYZAT?

• DUVYZAT can cause serious side effects, including changes in the electrical activity of your heart called QT prolongation. QT prolongation can increase the risk of developing a type of irregular heart rhythm known as Torsades de Pointes. Call your doctor right away if you feel faint, have an irregular heartbeat, feel dizzy, or lose consciousness. See the section titled "What is the most important information I should know about DUVYZAT?" for more information about side effects.

The most common side effects (occurring in >5% of DUVYZAT-treated patients) included diarrhea, abdominal pain, low platelet levels, nausea/vomiting, high triglyceride levels, elevated temperature/fever, muscle aches, rash, joint pain, fatigue, constipation and decreased appetite.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1- 800-FDA-1088.

Please see full Prescribing Information and Medication Guide