BioMarin to Begin Clinical Trial with BMN 307 Gene Therapy

BioMarin announced both the U.S. Food and Drug Administration (FDA) and the Medicines and Healthcare Products Regulatory Agency (MHRA) in the U.K. have granted the Company Investigational New Drug (IND) status and approved its Clinical Trial Application (CTA), respectively, for its investigational gene therapy candidate BMN 307. BMN 307 is an AAV5-phenylalanine hydroxylase (PAH) gene therapy designed to normalize blood phenylalanine (Phe) concentration levels in patients with PKU. BMN 307 will be evaluated to determine whether a single dose of treatment can restore natural Phe metabolism, normalize plasma Phe levels, and enable a normal diet in patients with PKU.

The Company expects to start dosing patients in PHEARLESS, a Phase 1/2 study, in the first quarter of 2020 with product made at commercial scale from its award-winning gene therapy manufacturing facility. The Company is actively preparing regulatory submissions to open additional clinical sites in other countries. BMN 307 represents a potential third PKU treatment option from BioMarin and its second gene therapy clinical program. Both the FDA and European Medicines Agency have granted BMN 307 Orphan Status.

"With BMN 307, we are joining together our expertise in PKU biology and the knowledge we have gained from developing the only two approved therapies for PKU with our understanding of gene therapy clinical development and manufacturing from our valoctocogene roxaparvovec experience," said Hank Fuchs, President, Worldwide Research and Development at BioMarin. "BioMarin has stood with the PKU community for over 15 years and remains dedicated to continuing to increase the body of medical knowledge in this devastating disease."

PKU is a rare genetic disease that manifests at birth and is marked by an inability to break down Phe, an amino acid that is commonly found in many foods. Left untreated, high levels of Phe become toxic to the brain and may lead to serious neurological and neuropsychological issues, affecting the way a person thinks, feels, and acts. Due to the seriousness of these symptoms, in many countries infants are screened at birth to ensure early diagnosis and treatment to avoid intellectual disability and other complications. According to treatment guidelines, PKU patients should maintain lifelong control of their Phe levels.

PKU, or PAH deficiency, is a genetic disorder affecting approximately 50,000 diagnosed patients in the regions of the world where BioMarin operates and is caused by a deficiency of the enzyme PAH. This enzyme is required for the metabolism of Phe, an essential amino acid found in most protein-containing foods. If the active enzyme is not present in sufficient quantities, Phe accumulates to abnormally high levels in the blood and becomes toxic to the brain, resulting in a variety of complications including severe intellectual disability, seizures, tremors, behavioral problems and psychiatric symptoms. As a result of newborn screening efforts implemented in the 1960s and early 1970s, virtually all individuals with PKU under the age of 40 in countries with newborn screening programs are diagnosed at birth and treatment is implemented soon after. PKU can be managed with a Phe-restricted diet, which is supplemented by low-protein modified foods and Phe-free medical foods; however, it is difficult for most patients to adhere to the life-long strict diet to the extent needed to achieve adequate control of blood Phe levels. Dietary control of Phe in childhood can prevent major developmental neurological toxicities, but poor control of Phe in adolescence and adulthood is associated with a range of neurocognitive disabilities with significant functional impact.

Gene therapy is a form of treatment designed to address a genetic problem by adding a normal copy of the defective gene. The functional gene is inserted into a vector containing a small DNA sequence that acts as a delivery mechanism, providing the ability to deliver the functional gene to targeted cells. The cells can then use the information from the normal gene to build the functional proteins that the body needs, potentially reducing or eliminating the cause of the disease.

Register as Visitor to CPhI China 2020!

-----------------------------------------------------------------------
Editor's Note:

En-CPhI.CN is a vertical B2B online trade platform serving the pharmaceutical industry,

for any copyright disputes involved in the articles,

please email: Julia.Zhang@imsinoexpo.com to motify or remove the content.