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Behind the Seizure™ Program Expansion Helps Speed the Diagnosis of Genetic Epilepsy in Younger Children Experiencing Unprovoked Seizures

Behind the Seizure™ Program Expansion Helps Speed the Diagnosis  of Genetic Epilepsy in Younger Children Experiencing Unprovoked Seizures

Stoke Therapeutics and Xenon Pharmaceuticals Join  Founders BioMarin and Invitae to Offer a No-Cost Epilepsy Gene Panel Testing  Program for Children Up to 60 Months Who Have Had an Unprovoked Seizure

SAN  FRANCISCO, February 26, 2019 -- As Rare Disease Day  focuses attention on the challenges of diagnosing rare, often genetic conditions, BioMarin  Pharmaceutical Inc. (NASDAQ: BMRN), Invitae  Corporation (NYSE: NVTA), Stoke  Therapeutics and Xenon Pharmaceuticals (NASDAQ: XENE) today announced the expansion of Behind  the Seizure, an innovative, cross-company collaboration that aims to  provide faster diagnosis for young children with epilepsy. Previously available  to patients ages 2-4 years, the program will expand eligibility to make no-cost  genetic testing available for healthcare providers to order for children who  have had an unprovoked seizure from birth up to age five (0 to 60 months).

"Genetic testing can be invaluable in helping families  and healthcare providers better understand how to care for children living with epilepsy," said Amy Brin Miller, executive director and chief executive office of  the Child Neurology Foundation. "We applaud this unique effort to bring  multiple partners together to help increase access to genetic testing for more  of their patients, including their youngest ones."

Since the program began, hundreds of children  have received genetic testing through Behind the Seizure and research has shown  participants in the program were diagnosed 1-2 years sooner than historic  averages.1

"Through this program we can secure comprehensive  genetic testing for a child who has had an unprovoked seizure at no cost to the patient. That testing helps us get to a diagnosis faster so we can focus on providing  the most accurate and timely treatment for our patients," said Raman Sankar,  M.D., professor and chief of pediatric neurology at UCLA Mattel Children's  Hospital in Los Angeles. "When dealing with such young patients, this type of  program can be very important, shortening the time to diagnosis, particularly for neurodegenerative conditions such as CLN2 disease."

Partners in the program sponsor the cost of  testing using the Invitae Epilepsy Panel, which includes up to 180+ genes  associated with both syndromic and non-syndromic causes of epilepsy, including  neurodegenerative conditions. With the expansion of the program, healthcare  providers can now order the test for patients under the age of five with  unprovoked seizures. Test results are available quickly (14 days on average).

"For many of the genetic disorders which cause  serious debilitating morbidities in young children, early diagnosis is of  paramount importance, and targeted early genetic testing is one way to overcome  the challenges of delayed diagnosis. Over the years we've heard from  physicians, advocacy groups, and parents about the challenges they face in  implementing genetic testing early, to provide accurate and timely diagnosis  that enables them to tailor their patients' care," said Adrian Quartel, group vice  president and head of medical affairs for BioMarin. "We're proud to be working  with our partners to further expand the Behind the Seizure program and foster  earlier genetic testing – especially for the youngest patients."

"More than half of  epilepsies are based in genetics. When a child experiences a seizure,  performing genetic testing quickly using a comprehensive gene panel is a highly  cost-effective and informative diagnostic tool. Quickly finding an underlying  cause for infantile epilepsy can be crucial for making a difference for that  patient with precision management and treatment options," said Robert Nussbaum,  M.D., chief medical officer of Invitae. "We're proud to partner with BioMarin,  Stoke and Xenon to help more children get access to genetic testing sooner."

"At Stoke, we're focused  on developing therapies that address the root cause of genetic epilepsies,  starting with Dravet syndrome. As precision medicines become available, it is  increasingly important for patients to get early and accurate genetic testing  so they can be matched with the appropriate treatment. That's why we're delighted  to support this critical expansion of the Behind the Seizure program," said Ed  Kaye, M.D., chief executive officer of Stoke Therapeutics.

"Xenon is proud to be part of the Behind the  Seizure collaboration, which aims to rapidly identify the genetic cause of  seizures in children, including KCNQ2 and SCN8A epileptic encephalopathies. By  offering this genetic testing to very young patients, it is hoped that the  results will lead to earlier diagnoses and improved treatment outcomes through  the introduction of personalized medicine approaches," said Simon Pimstone,  M.D., chief executive officer of Xenon Pharmaceuticals.

To learn more about the Behind  the Seizure program please visit https://www.invitae.com/en/behindtheseizure/.


About  BioMarin
BioMarin is a global biotechnology company  that develops and commercializes innovative therapies for patients with serious  and life-threatening rare and ultra-rare genetic diseases. The company's  portfolio consists of seven commercialized products and multiple clinical and  pre-clinical product candidates. For additional information, please visit  www.biomarin.com.

About  Invitae
Invitae Corporation (NYSE: NVTA) is a leading  genetics company whose mission is to bring comprehensive genetic information into mainstream medicine to improve healthcare for billions of people.  Invitae's goal is to aggregate the world's genetic tests into a single service  with higher quality, faster turnaround time, and lower prices. For more  information, visit the company's website at invitae.com.

About  Stoke Therapeutics
Launched in 2018, Stoke Therapeutics is a  biotechnology company working to increase gene expression to treat a wide array  of severe genetic diseases, including genetic conditions affecting the central  nervous system, eye, liver and kidney. Stoke's lead program addresses Dravet  syndrome, one of the more common causes of genetic epilepsy. Stoke has raised  $130 million in funding from two rounds of financing; investors include Apple  Tree Partners, RTW Investments, RA Capital Management, Cormorant Asset Management, Perceptive Advisors, funds managed by Janus Henderson Investors,  Redmile Group, Sphera Funds Management, and Alexandria Venture Investments. For  more information, visit www.StokeTherapeutics.com and follow Stoke on Twitter @StokeTx.

About  Xenon Pharmaceuticals
Xenon Pharmaceuticals is a clinical stage  biopharmaceutical company committed to developing innovative therapeutics to  improve the lives of patients with neurological disorders, including rare  central nervous system (CNS) conditions. We are advancing a novel product  pipeline of neurology therapies to address areas of high unmet medical need,  with a focus on epilepsy. For more information, please visit www.xenon-pharma.com.

Safe Harbor  Statements
This press release contains forward-looking statements within the meaning  of the Private Securities Litigation Reform Act of 1995, including statements  relating to the benefits of genetic testing and the Behind the Seizure program,  including shortening the time to diagnosis and improved treatment outcomes for  patients. Forward-looking statements are subject to risks and uncertainties  that could cause actual results to differ materially, and reported results  should not be considered as an indication of future performance. These risks  and uncertainties include, but are not limited to: the company's ability to use  rapidly changing genetic data to interpret test results accurately and  consistently; the ability of genetic testing to result in faster or more accurate  diagnosis; laws and regulations applicable to the company's business; and the  other risks set forth in Invitae's filings with the Securities and Exchange  Commission, including the risks set forth in its Quarterly Report on Form 10-Q  for the quarter ended September 30, 2018. These forward-looking statements  speak only as of the date hereof, and Invitae Corporation disclaims any  obligation to update these forward-looking statements.


Contact:
Laura D'Angelo
pr@invitae.com
 (628) 213-3283

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1Miller, Nicole, et al, "Behind the Seizure: A  No-Cost 125-gene Epilepsy Panel for Pediatric Seizure Onset Between 2–4 Years".  Presented at the American Society of Human Genetics Meeting: October 16–20,  2018, San Diego, CA.