PTC Therapeutics Announces the European Approval of Evrysdi™ for the Treatment of Spinal Muscular Atrophy

- First and only at home treatment approved for SMA -

- Proven efficacy in adults and children with SMA 2 months and older -

SOUTH PLAINFIELD, NJ, USA I March 30, 2021 I PTC Therapeutics, Inc. (NASDAQ: PTCT) today announced that the European Commission (EC) has granted marketing authorization to Evrysdi™ (risdiplam) for the treatment of spinal muscular atrophy (SMA) in patients 2 months and older. Evrysdi will be for SMA Type 1, Type 2 or Type 3 patients with one to four SMN2 copies. The EC approval is based on two studies; 1) the efficacy results from the FIREFISH study in infants aged 2 to 7 months with symptomatic Type 1 SMA, and 2) the SUNFISH study in children and young adults with Type 2 or 3 SMA. The review was completed under the accelerated assessment pathway for medicines, which is offered to medicines deemed to be of major interest for public health and therapeutic innovation.

"We're thrilled that Evrysdi, with proven efficacy and safety, has been rapidly approved in Europe so that the SMA community will now have access to a much needed convenient at-home treatment," said Stuart W. Peltz, Ph.D., Chief Executive Officer, PTC Therapeutics. "Evrysdi was discovered using our novel splicing technology and is an incredibly innovative drug that was the first in demonstrating that a small molecule can selectively and specifically modulate splicing to treat the underlying cause of this devastating disease. We're excited to see this therapy become more available to patients around the world."

More than 3,000 patients have now been treated with Evrysdi in clinical trials, compassionate use programs and real-world settings, with patients ranging from birth to over 70 years old including those previously treated with other SMA therapies. The EU approval is applicable to all 27 European Union member states, as well as Iceland, Norway, and Liechtenstein. Evrysdi was granted PRIME designation by the European Medicines Agency (EMA) in 2018 and Orphan Drug Designation in 2019. Maintenance of Orphan Drug Designation was recently confirmed by the Committee for Orphan Medicinal Products based on the assumption of Evrysdi's significant benefit over existing treatments. Evrysdi has currently been approved in 38 countries and submitted in a further 33 countries.

Evrysdi is based on PTC science and is commercialized in the United States by Genentech, a member of the Roche Group. Roche leads the clinical development of Evrysdi as part of a collaboration with the SMA Foundation and PTC Therapeutics.

About Spinal Muscular Atrophy (SMA)
Spinal muscular atrophy (SMA) is a severe, progressive neuromuscular disease that can be fatal. It affects approximately 1 in 10,000 babies and when untreated is the leading genetic cause of infant mortality. SMA is caused by a mutation of the survival motor neuron 1 (SMN1) gene, which leads to a deficiency of SMN protein. This protein is found throughout the body and is essential to the function of nerves that control muscles and movement. Without it, nerve cells cannot function correctly, leading to progressive muscle weakness over time. Depending on the type of SMA, an individual's physical strength and their ability to walk, eat or breathe can be significantly diminished or lost.

About Evrysdi™ (risdiplam)
Evrysdi™ is a survival motor neuron 2 (SMN2)-directed RNA splicing modifier designed to treat SMA caused by mutations in chromosome 5q that lead to SMN protein deficiency. Evrysdi™ is designed to distribute evenly to all parts of the body, including the central nervous system (CNS). Evrysdi™ is administered daily at home in liquid form by mouth or feeding tube. The U.S. Food and Drug Administration recently approved Evrysdi™ (risdiplam) for the treatment of spinal muscular atrophy for adults and children 2 months and older. Evrysdi™ (risdiplam) is marketed in the United States by Genentech, a member of the Roche Group.

About the Evrysdi™ (risdiplam) Clinical Studies

FIREFISH (NCT02913482) is an open-label, two-part pivotal clinical trial in infants with Type 1 SMA. Part 1 was a dose-escalation study in 21 infants with the primary objective of assessing the safety profile of risdiplam in infants and determining the dose for Part 2. Part 2 is a pivotal, single-arm study of risdiplam in 41 infants with Type 1 SMA treated for two years followed by an open-label extension. The primary objective of Part 2 was to assess efficacy as measured by the proportion of infants sitting without support after 12 months of treatment, as assessed in the Gross Motor Scale of the Bayley Scales of Infant and Toddler Development - Third Edition (BSID-III) (defined as sitting without support for five seconds). The study met its primary endpoint.

SUNFISH (NCT02908685) is a two part, double-blind, placebo controlled pivotal study in people aged 2 to 25 years with Types 2 or 3 SMA. Part 1 (n=51) determined the dose for the confirmatory Part 2. Part 2 (n=180) evaluated motor function using the Motor Function Measure 32 (MFM-32) scale at 12 months. MFM-32 is a validated scale used to evaluate fine and gross motor function in people with neurological disorders, including SMA. The study met its primary endpoint.

Clinical Trial Safety Data
The safety profile of Evrysdi™ was established across FIREFISH and SUNFISH pivotal trials. The most common adverse reactions in later-onset SMA (incidence of at least 10 percent of patients treated with Evrysdi™ and more frequently than control) were fever, diarrhea, and rash. The most common adverse reactions in infantile-onset SMA were similar to those observed in later-onset SMA patients. Additionally, the most common adverse reactions (incidence of at least 10 percent) were upper respiratory tract infection, pneumonia, constipation, and vomiting.

In addition to FIREFISH and SUNFISH, Evrysdi™ is being evaluated in a broad range of people with SMA, including in:

JEWELFISH (NCT03032172) is an open-label exploratory trial designed to assess the safety, tolerability, pharmacokinetics (PK) and pharmacodynamics (PD) in people with SMA aged 6 months to 60 years who received other investigational or approved SMA therapies for at least 90 days prior to receiving Evrysdi™. The study has completed recruitment (n=174).

RAINBOWFISH (NCT03779334) is an open-label, single-arm, multi-center study, investigating the efficacy, safety, pharmacokinetics, and pharmacodynamics of risdiplam in babies (~n=25), from birth to 6 weeks old (at first dose), with genetically diagnosed SMA, who are not yet presenting symptoms. The study is currently recruiting.

About PTC Therapeutics, Inc.
PTC is a science-driven, global biopharmaceutical company focused on the discovery, development and commercialization of clinically differentiated medicines that provide benefits to patients with rare disorders. PTC's ability to globally commercialize products is the foundation that drives investment in a robust and diversified pipeline of transformative medicines and our mission to provide access to best-in-class treatments for patients who have an unmet medical need. The Company's strategy is to leverage its strong scientific expertise and global commercial infrastructure to maximize value for its patients and other stakeholders. To learn more about PTC, please visit us at www.ptcbio.com and follow us on Facebook, on Twitter at @PTCBio, and on LinkedIn.

SOURCE: PTC Therapeutics

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