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uniQure Highlights Pipeline Expansion and Advancements in Technology at Research & Development Day

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Unveils New AAV Gene Therapy Approaches to Hemophilia A, Fabry Disease and Spinocerebellar Ataxia Type 3

Introduces miQURE™ Gene Silencing Platform with Applications Across Multiple Indications

Highlights Advancements in Manufacturing and Research Technology

uniQure N.V. (NASDAQ: QURE), a leading gene therapy company advancing transformative therapies for patients with severe medical needs, today announced the expansion of its research pipeline with novel AAV gene therapy approaches to treating Hemophilia A, Fabry disease and Spinocerebellar Ataxia Type 3 at the Company’s Research & Development Day held this morning in New York City.

“We are very proud of the progress the Company has made to deliver extensive preclinical data for these new gene therapy programs that expand our pipeline and further validate uniQure’s potential best-in-class vector delivery platform,” stated Sander van Deventer, M.D., Ph.D., chief scientific officer at uniQure. “The addition of these gene therapy candidates for indications in the liver and CNS brings us yet another step closer towards uniQure's goal of delivering transformational medicine to patients suffering from genetic diseases. We look forward to advancing these programs closer to the clinic in 2019.”

New Gene Therapy Programs
➢ Introduced new product candidate AMT-180, a novel hemophilia A gene therapy that has the potential to treat all hemophilia A patients including those with past and current inhibitors.

o Approximately 30 percent of patients with severe hemophilia A will develop an inhibitor that neutralizes the infused Factor VIII (FVIII) activity. This patient population has in the past been excluded from gene therapy approaches in clinical development.
o AMT-180 is a one-time, intravenously-administered, AAV5-based gene therapy incorporating a proprietary modified Factor IX gene, Super9™, that has been demonstrated in preclinical studies to circumvent inhibitors to FVIII.
o A proof-of-concept study demonstrated that administration of Super9 resulted in clinically relevant FVIII mimetic activity in hemophilia A mice and was not associated with hypercoagulability in wild-type mice.
o Another study in non-human primates demonstrated that a single dose of AMT-180 resulted in expression levels that translate into FVIII mimetic activity expected to be clinically relevant in hemophilia A patients with or without inhibitors. In addition, Super9 induced clinically relevant thrombin activation in FVIII-depleted human plasma with or without inhibitors.
o These data show that AMT-180 may lead to durable expression in hemophilia A patients and may provide long-term prevention of bleeds.

➢ Introduced new product candidate AMT-190, a differentiated gene therapy for the treatment of Fabry disease.

o Fabry disease is an inherited lysosomal storage disorder caused by a defect in a gene that encodes for a protein called α-galactosidase A (GLA). The GLA protein is an essential enzyme required to breakdown globotriaosylsphingosine (Gb3) and lyso-globotriaosylsphingosine (lyso-Gb3). In patients living with Fabry disease, Gb3 and lyso-Gb3 accumulate in various cells throughout the body causing progressive clinical signs and symptoms of the disease. Current treatment options, which consist of bi-weekly intravenous enzyme replacement therapy, have no therapeutic benefit in patients with advanced renal or cardiac disease. Studies have also shown that a majority of male patients develop antibodies that inhibit the GLA protein and interfere with therapeutic efficacy.
o AMT-190 is a one-time, intravenously-administered, AAV5-based gene therapy designed to circumvent GLA antibodies that can inhibit efficacy in Fabry patients. AMT-190 incorporates a modified version of α-N-acetylgalactosaminidase (NAGA), a protein that is structurally similar to the GLA protein but is not recognized by GLA-neutralizing antibodies. As such, AMT-190 has the potential to be a more effective, longer-term treatment of Fabry disease.
o In cultured cells and in a study in wild-type mice, AMT-190 resulted in clinically relevant GLA activity.
o In a preclinical proof-of-concept study, Fabry mice were injected with a single dose of AMT-190, resulting in modified NAGA expression with subsequent GLA-activity in plasma. At 2 and 4 weeks post-dosing, this GLA activity already translated to up to 50 percent reduction in lyso-Gb3 levels.
o These studies demonstrate proof-of-concept of AMT-190 as a gene therapy candidate for Fabry disease. A one-time administration of AMT-190 could potentially lead to long-term expression of GLA in the liver, kidneys and heart, with no loss of expression due to inhibitors.
➢ Introduced new gene therapy candidate AMT-150, a novel treatment for Spinocerebellar Ataxia Type 3, a central nervous system disorder.
o Spinocerebellar Ataxia Type 3 (SCA3), also known as Machado-Joseph disease, is caused by a CAG-repeat expansion in the ATXN3 gene that results in an abnormal form of the protein ataxin-3. People with SCA3 experience brain degeneration that results in movement disorders, rigidity, muscular atrophy and paralysis. There is currently no treatment available that slows the progressive course of this lethal disease.
o AMT-150 is a one-time, intrathecally-administered, AAV gene therapy incorporating the Company’s proprietary miQURE™ silencing technology that is designed to halt ataxia in early manifest SCA3 patients.
o In an in-vitro study with human Induced Pluripotent Stem (IPS) derived neurons, AMT-150 has been shown to lower the human ataxin-3 protein by 65 percent, without any off-target effects. The Company also performed a proof-of-concept in-life study in SCA3 mice demonstrating that AMT-150 was able to lower toxic ataxin-3 protein by 65 percent in the brain stem after a single administration. Further studies in non-human primates demonstrate the ability to distribute and express a reporter gene at a clinically relevant level in the most degenerated brain regions in SCA3.
o These preclinical studies show that a single administration of AMT-150 results in sustained expression and efficient processing with on-target engagement. They also show that AMT-150 appears to be safe due to the lack of off-target activity. The Company is currently performing studies in large animals to demonstrate further safety and efficacy.