ProQR to Present Findings from Phase 1/2 Interim Analysis of QR-421a for Usher Syndrome

LEIDEN, Netherlands & CAMBRIDGE, Mass., March 25, 2020 (GLOBE NEWSWIRE) -- ProQR Therapeutics N.V. (Nasdaq:PRQR), a company dedicated to changing lives through the creation of transformative RNA therapies for severe genetic rare diseases, today announced that Company management will present and discuss findings from a planned three-month interim analysis of its Phase 1/2 Stellar trial of QR-421a in adults with Usher syndrome and non-syndromic retinitis pigmentosa on March 31, 2020. The findings will be announced in a press release and management will host an investor conference call at 8:15 a.m. ET the same day to discuss the results in detail.

The live and archived webcast of this presentation can be accessed through the Events and Presentations page on the Investors section of the Company’s website, The dial-in details for the call are +1 631-510-7495 (US), +31 (0)20 714 3545 (NL), conference ID: 5986384. The archived webcasts will be available for approximately 30 days following the presentation date.

About the Stellar Phase 1/2 Trial

Stellar, or PQ-421a-001, is a first-in-human study of QR-421a in adults who have vision loss due to mutations in exon 13 of the USH2A gene and is conducted at expert sites in North America and Europe. It is a double-masked, randomized, 24-month study exploring the safety and efficacy of a single intravitreal injection of several dose levels of QR-421a and a control sham procedure into one eye.

About QR-421a

QR-421a is a first-in-class investigational RNA therapy designed to address the underlying cause of vision loss in Usher syndrome type 2 and non-syndromic retinitis pigmentosa (RP) due to mutations in exon 13 of the USH2A gene. QR-421a is designed to restore functional Usherin protein by using an exon skipping approach with the aim to stop or reverse vision loss in patients. QR-421a is intended to be administered through intravitreal injections in the eye and has been granted orphan drug designation in the US and the European Union and received fast-track and rare pediatric disease designations from the FDA.

About Usher Syndrome Type 2 and Non-Syndromic Retinitis Pigmentosa

Usher syndrome is the leading cause of combined deafness and blindness. People with Usher syndrome type 2 are usually born with hearing loss and start to have progressive vision loss during adulthood. The vision loss can also occur without hearing loss in a disease called non-syndromic retinitis pigmentosa. Usher syndrome type 2 and non-syndromic retinitis pigmentosa can be caused by mutations in the USH2A gene. To date, there are no pharmaceutical treatments approved or in clinical development that treat the vision loss associated with mutations in USH2A.  

About ProQR

ProQR Therapeutics is dedicated to changing lives through the creation of transformative RNA therapies for the treatment of severe genetic rare diseases such as Leber’s congenital amaurosis 10, Usher syndrome and autosomal dominant retinitis pigmentosa. Based on our unique proprietary RNA repair platform technologies we are growing our pipeline with patients and loved ones in mind.
*Since 2012*


This press release contains forward-looking statements. All statements other than statements of historical fact are forward-looking statements, which are often indicated by terms such as "anticipate," "believe," "could," "estimate," "expect," "goal," "intend," "look forward to", "may," "plan," "potential," "predict," "project," "should," "will," "would" and similar expressions. Such statements include those relating to our announcement of interim analysis findings from our QR-421a clinical trial and the therapeutic potential of our product candidates, including QR-421a. Forward-looking statements are based on management's beliefs and assumptions and on information available to management only as of the date of this press release. Our actual results could differ materially from those anticipated in these forward-looking statements for many reasons, including, without limitation, the risks, uncertainties and other factors in our filings made with the Securities and Exchange Commission, including certain sections of our annual report filed on Form 20-F. Given these risks, uncertainties and other factors, you should not place undue reliance on these forward-looking statements, and we assume no obligation to update these forward-looking statements, even if new information becomes available in the future, except as required by law.

ProQR Therapeutics N.V.

Investor Contact:
Sarah Kiely
ProQR Therapeutics N.V.
T: +1 617 599 6228
Hans Vitzthum
LifeSci Advisors
T: +1 617 535 7743  

Media Contact:
Sara Zelkovic
LifeSci Public Relations
T: +1 646 876 4933


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