Chiesi Global Rare Diseases Announces FDA Approval of PRX-102 (pegunigalsidase alfa-iwxj) for the Treatment of Fabry Disease

BOSTON, May 10, 2023 - Chiesi Global Rare Diseases, a business unit of the Chiesi Group established to deliver innovative therapies and solutions for people affected by rare diseases, announced today that the U.S. Food and Drug Administration (FDA) has approved PRX-102 (pegunigalsidase alfa-iwxj) in the United States for the treatment of adult patients with Fabry disease.

BOSTON, May 10, 2023 - Chiesi Global Rare Diseases, a business unit of the Chiesi Group established to deliver innovative therapies and solutions for people affected by rare diseases, announced today that the U.S. Food and Drug Administration (FDA) has approved PRX-102 (pegunigalsidase alfa-iwxj) in the United States for the treatment of adult patients with Fabry disease.

“While much progress has been made in the treatment of Fabry disease, there is still a need for new treatment options,” said Giacomo Chiesi, head of Chiesi Global Rare Diseases. “We established Chiesi Global Rare Diseases to deliver innovative therapies and solutions for people affected by rare diseases. With the FDA approval of PRX-102, we can now offer people living with Fabry disease an alternative treatment option.”

PRX-102, a PEGylated enzyme replacement therapy (ERT), is a recombinant human α-Galactosidase‑-‑A enzyme expressed in plant-cell culture.

The safety, tolerability, and efficacy of PRX-102 have been studied in a comprehensive clinical development program in more than 140 patients with up to 7.5 years of follow up treatment. PRX-102 demonstrated consistent and robust efficacy findings in treatment-naïve patients, including a significant reduction in renal Gb₃ inclusions in the peritubular capillaries (PTC). PRX-102 was generally well-tolerated with the majority of adverse events being mild or moderate in severity. In the BALANCE trial, a two-year, active control study, patients with Fabry disease and deteriorating renal function at baseline and prior treatment with agalsidase beta >1 year (average 5.7 years), the estimated mean eGFR slopes were comparable between treatment arms. Overall, patients who switched to PRX-102 showed favorable tolerability and immunogenicity profiles.

Indication and Important Safety Information

Indication
PRX-102 (pegunigalsidase alfa-iwxj) is indicated for the treatment of adults with confirmed Fabry disease.

Important Safety Information

Prior to PRX-102 administration, consider pretreating with antihistamines, antipyretics, and/or corticosteroids. Inform patients and caregivers of the signs and symptoms of hypersensitivity reactions and infusion-associated reactions (IARs) and instruct them to seek medical care immediately if such symptoms occur.

• If a severe hypersensitivity reaction (including anaphylaxis) or severe IAR occurs, immediately discontinue PRX-102 administration and initiate appropriate medical treatment.
• If a mild to moderate hypersensitivity reaction or IAR occurs, consider slowing the infusion rate or temporarily withholding the dose.

In clinical trials, 20 (14%) PRX-102-treated patients experienced hypersensitivity reactions.

Four PRX-102-treated patients (3%) experienced anaphylaxis reactions that occurred within 5 to 40 minutes of the start of the initial infusion. The signs and symptoms of hypersensitivity reactions and anaphylaxis included headache, nausea, vomiting, throat tightness, facial and oral edema, truncal rash, tachycardia, hypotension, rigors, urticaria, intense pruritus, moderate upper airway obstructions, macroglossia, and mild lip edema.

In clinical trials, 41 (29%) PRX-102-treated patients experienced one or more infusion-associated reactions, including hypersensitivity, nausea, chills, pruritus, rash, chest pain, dizziness, vomiting, asthenia, pain, sneezing, dyspnea, nasal congestion, throat irritation, abdominal pain, erythema, diarrhea, burning sensation, neuralgia, headache, paresthesia, tremor, agitation, increased body temperature, flushing, bradycardia, myalgia, hypertension, and hypotension.

A case of membranoproliferative glomerulonephritis with immune depositions in the kidney was reported during clinical trials. Monitor serum creatinine and urinary protein-to-creatinine ratio. If glomerulonephritis is suspected, discontinue treatment until a diagnostic evaluation can be conducted.

When switching to PRX-102 from a prior enzyme replacement therapy, the risk of hypersensitivity reactions and infusion-associated reactions may be increased in certain patients with pre-existing anti-drug antibodies (ADAs). Consider monitoring IgG and IgE ADAs and clinical or pharmacodynamic response (eg, plasma lyso-Gb3 levels).

The most common adverse reactions (≥15%) were infusion-associated reactions, nasopharyngitis, headache, diarrhea, fatigue, nausea, back pain, pain in extremity, and sinusitis.

Please see Full Prescribing Information for PRX-102.

About Fabry Disease
Fabry disease is an X-linked inherited disease that results from deficient activity of the lysosomal α‑-Galactosidase‑-‑A enzyme resulting in progressive accumulation of abnormal deposits of a fatty substance called globotriaosylceramide (Gb₃) in the lysosomes throughout a person’s body. Fabry disease occurs in one person per 40,000 to 60,000. Fabry patients inherit a deficiency of the α-‑Galactosidase-‑A enzyme, which is normally responsible for the breakdown of Gb₃. The abnormal storage of Gb₃ increases with time and, accordingly, Gb₃ accumulates, primarily in the blood vessel and tissues. The ultimate consequences of Gb₃ deposition range from episodes of pain and impaired peripheral sensation to end-organ failure.

About PRX-102
PRX-102 (pegunigalsidase alfa-iwxj), a PEGylated enzyme replacement therapy (ERT) to treat Fabry disease, is a plant cell culture-expressed, and chemically modified stabilized recombinant version of the α-‑Galactosidase-‑A enzyme. Protein sub-units are covalently bound via chemical cross-linking using short PEG moieties, resulting in a molecule with stable pharmacokinetic parameters. In clinical studies, PRX-102 has been observed to have an initial half-life of 78.9 ± 10.3 hours.

About Chiesi Global Rare Diseases
Chiesi Global Rare Diseases is a business unit of the Chiesi Group established to deliver innovative therapies and solutions for people affected by rare diseases. As a family business, Chiesi Group strives to create a world where it is common to have a therapy for all diseases and acts as a force for good, for society and the planet. The goal of the Global Rare Diseases unit is to ensure equal access so as many people as possible can experience their most fulfilling life. The unit collaborates with the rare disease community around the globe to bring voice to underserved people in the health care system.
For more information visit www.chiesirarediseases.com.

About Chiesi Group
Chiesi is an international, research-focused biopharmaceuticals group that develops and markets innovative therapeutic solutions in respiratory health, rare diseases, and specialty care. The company’s mission is to improve people’s quality of life and act responsibly towards both the community and the environment.

By changing its legal status to a Benefit Corporation in Italy, the US, and France, Chiesi’s commitment to create shared value for society as a whole is legally binding and central to company-wide decision-making. As a certified B Corp since 2019, we’re part of a global community of businesses that meet high standards of social and environmental impact. The company aims to reach Net-Zero greenhouse gases (GHG) emissions by 2035.

With over 85 years of experience, Chiesi is headquartered in Parma (Italy), operates in 31 countries, and counts more than 6,500 employees. The Group’s research and development centre in Parma works alongside 6 other important R&D hubs in France, the US, Canada, China, the UK, and Sweden.
For further information please visit www.chiesi.com.

Chiesi Group Media Contact
Chiara Travagin
Rare Communication Manager
Tel: +39 348 8818985
Email  c.travagin@chiesi.com

Alessio Pappagallo
Press Office Manager
Tel: +39 339 5897483
Email a.pappagallo@chiesi.com  

Adam Daley
Berry & Company Public Relations
1-212-253-8881
adaley@berrypr.com