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~ AMT-060 with the FIX-Padua Modification (AMT-061) Demonstrates Substantial Increase in FIX Activity in Non-human Primates ~

~ Plans to Initiate Pivotal Study with Enhanced AMT-061 in 2018 ~

~ Achieves Alignment with FDA on Streamlined Clinical and Regulatory Strategy for AMT-061, Which Will be Included Under Existing Breakthrough Therapy Designation ~

~ Acquires a Patent Family Covering FIX-Padua in Hemophilia B ~

Lexington, MA and Amsterdam, the Netherlands, October 19, 2017 — uniQure N.V. (NASDAQ: QURE), a leading gene therapy company advancing transformative therapies for patients with severe medical needs, today announced that following multi-disciplinary meetings with the U.S. Food and Drug Administration (FDA) and the European Medicines Agency (EMA), the company plans to expeditiously advance AMT-061, which combines an AAV5 vector with the FIX-Padua mutant, into a pivotal study in 2018 for patients with severe and moderately severe hemophilia B.

AMT-061 and AMT-060, the latter of which has been tested in 10 patients in an ongoing Phase I/II clinical trial, are identical in structure apart from two nucleotide substitutions in the coding sequence for FIX. The gene variant, referred to as FIX-Padua, expresses a protein with a single amino acid substitution that has been reported in multiple preclinical and nonclinical studies to provide an approximate 8 to 9-fold increase in FIX activity compared to the wild-type FIX protein. All other critical quality attributes of AMT-061 are expected to be comparable to those of AMT-060, as AMT-061 utilizes the same AAV5 capsid and proprietary insect cell-based manufacturing platform.

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