Release Details

CAMBRIDGE, Mass., June 21, 2018 (GLOBE NEWSWIRE) -- Voyager Therapeutics, Inc. (NASDAQ:VYGR), a clinical-stage gene therapy company focused on developing life-changing treatments for severe neurological diseases today announced that the U.S. Food and Drug Administration (FDA) granted Regenerative Medicine Advanced Therapy (RMAT) designation for Voyager’s VY-AADC gene therapy treatment for Parkinson’s disease in patients with motor fluctuations that are refractory to medical management.

“The RMAT designation was based on our Phase 1b clinical data with VY-AADC and represents an important milestone for the program and recognition of this gene therapy as a potential treatment for Parkinson’s disease,” said Robert Pietrusko, Pharm.D., senior vice president of regulatory affairs and quality assurance at Voyager. “We look forward to working closely with the agency through the benefits of the RMAT designation for guidance on the development of VY-AADC including advice to generate evidence needed to support its potential approval in an efficient manner.”

Recently established under the 21st Century Cures Act, RMAT designation is an expedited program for the advancement and approval of regenerative medicine products, including gene therapy products. The designation includes all the benefits of the FDA’s Fast Track and Breakthrough Therapy designation programs, with the ability for early interactions with the agency to discuss any surrogate or intermediate endpoints to support the potential acceleration of approval and satisfy post-approval requirements.

An investigational drug or therapy is eligible for RMAT designation if it meets the definition of a “regenerative medicine therapy” as defined in the 21st Century Cures Act, it is intended to treat, modify, reverse, or cure a serious or life-threatening disease or condition, and preliminary clinical evidence indicates that the therapy has the potential to address unmet medical needs for such disease or condition.

RMAT designation for VY-AADC was granted based on clinical data from the ongoing Phase 1b trial with VY-AADC in patients with Parkinson’s disease. During this trial, one-time administrations of VY-AADC demonstrated robust and durable improvements in patients’ motor function along with substantial reductions in use of daily oral levodopa and other Parkinson’s disease medications. Infusions of VY-AADC have been well-tolerated in this trial with no vector-related serious adverse events (SAEs) reported to date.

About Parkinson’s Disease and VY-AADC

Parkinson’s disease is a chronic, progressive and debilitating neurodegenerative disease that affects approximately 1,000,000 people in the U.S.¹ and seven to 10 million people worldwide². While the underlying cause of Parkinson’s disease in most patients is unknown, the motor symptoms of the disease arise from a loss of neurons in the midbrain that produce the neurotransmitter dopamine. Declining levels of dopamine in this region of the brain, the putamen, leads to the motor symptoms associated with Parkinson’s disease, including tremors, slow movement or loss of movement, rigidity, and postural instability. Motor symptoms during the advanced stages of the disease include falling, gait freezing, and difficulty with speech and swallowing, with patients often requiring the daily assistance of a caregiver. 

There are currently no therapies that effectively slow or reverse the progression of Parkinson’s disease. Levodopa remains the standard of care treatment, with its beneficial effects on symptom control having been discovered over 40 years ago³. Patients are generally well-controlled with oral levodopa in the early stages of the disease but become less responsive to treatment as the disease progresses. Patients experience longer periods of reduced mobility and stiffness termed off-time, or the time when medication is no longer providing benefit, and shorter periods of on-time when their medication is effective.

The progressive motor symptoms of Parkinson’s disease are largely due to the death of dopamine neurons in the substantia nigra, a part of the midbrain that converts levodopa to dopamine, in a single step catalyzed by the enzyme AADC. Neurons in the substantia nigra release dopamine into the putamen where the receptors for dopamine reside. In Parkinson’s disease, neurons in the substantia nigra degenerate and the enzyme AADC is markedly reduced in the putamen, which limits the brain’s ability to convert oral levodopa to dopamine⁴. The intrinsic neurons in the putamen, however, do not degenerate in Parkinson’s disease^5,6. VY-AADC, comprised of the adeno-associated virus-2 capsid and a cytomegalovirus promoter to drive AADC transgene expression, is designed to deliver the AADC gene directly into neurons of the putamen where dopamine receptors are located, bypassing the substantia nigra neurons and enabling the neurons of the putamen to express the AADC enzyme to convert levodopa into dopamine. The approach with VY-AADC, therefore, has the potential to durably enhance the conversion of levodopa to dopamine and provide clinically meaningful improvements by restoring motor function in patients and improving symptoms following a single administration.

About Voyager Therapeutics

Voyager Therapeutics is a clinical-stage gene therapy company focused on developing life-changing treatments for severe neurological diseases. Voyager is committed to advancing the field of AAV gene therapy through innovation and investment in vector engineering and optimization, manufacturing and dosing and delivery techniques. Voyager’s pipeline focuses on severe neurological diseases in need of effective new therapies, including Parkinson’s disease, a monogenic form of ALS called SOD1, Huntington’s disease, Friedreich’s ataxia, neurodegenerative diseases related to defective or excess aggregation of tau protein in the brain including Alzheimer’s disease and severe, chronic pain. Voyager has broad strategic collaborations with Sanofi Genzyme, the specialty care global business unit of Sanofi, AbbVie, and the University of Massachusetts Medical School. Founded by scientific and clinical leaders in the fields of AAV gene therapy, expressed RNA interference and neuroscience, Voyager Therapeutics is headquartered in Cambridge, Massachusetts. For more information, please visit www.voyagertherapeutics.com. 

Forward-Looking Statements

This press release contains forward-looking statements for the purposes of the safe harbor provisions under The Private Securities Litigation Reform Act of 1995 and other federal securities laws. The use of words such as “may,” “might,” “will,” “would,” “should,” “expect,” “plan,” “anticipate,” “believe,” “estimate,” “undoubtedly,” “project,” “intend,” “future,” “potential,” or “continue,” and other similar expressions are intended to identify forward-looking statements. For example, all statements Voyager makes regarding the initiation, timing, progress and reporting of results of its preclinical programs and clinical trials and its research and development programs, its ability to advance its AAV-based gene therapies into, and successfully initiate, enroll and complete, clinical trials, the potential clinical utility of its product candidates, its ability to continue to develop its gene therapy platform, its ability to develop manufacturing capability for its products and successfully transition its manufacturing process, its ability to perform under existing collaborations with, among others, Sanofi Genzyme and AbbVie and to add new programs to its pipeline, its ability to enter into new partnerships or collaborations, and the timing or likelihood of its regulatory filings and approvals, are forward looking. All forward-looking statements are based on estimates and assumptions by Voyager’s management that, although Voyager believes to be reasonable, are inherently uncertain. All forward-looking statements are subject to risks and uncertainties that may cause actual results to differ materially from those that Voyager expected. Such risks and uncertainties include, among others, the initiation and conduct of preclinical studies and clinical trials; the availability of data from clinical trials; the expectations for regulatory submissions and approvals; the continued development of the gene therapy platform; Voyager’s scientific approach and general development progress; and the availability or commercial potential of Voyager’s product candidates. These statements are also subject to a number of material risks and uncertainties that are described in Voyager’s most recent Annual Report on Form 10-K filed with the Securities and Exchange Commission, as updated by its subsequent filings with the Securities and Exchange Commission. Any forward-looking statement speaks only as of the date on which it was made. Voyager undertakes no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events or otherwise, except as required by law.

¹ Willis et al, Neuroepidemiology.2010;34:143–151
²www.pdf.org/en/parkinson_statistics
³ Poewe W, et al, Clinical Interventions in Aging.2010;5:229-238.
⁴ Lloyd, J Pharmacol Exp Ther. 1975;195:453-464, Nagatsu, J Neural Transm Suppl.2007
⁵ Cold Spring Harb Perspect Med 2012;2:a009258
⁶ Braak et al, Cell Tissue Res.2004;318:121-134

Investor Relations:
Matt Osborne
Vice President of Investor Relations & Corporate Communications
857-259-5353
mosborne@vygr.com

Media:
Julie NormartW2O Group
+1 (415) 946-1087
jnormart@w2ogroup.com

Source: Voyager Therapeutics, Inc.