Re-dosing plans are underway and 96-week data from an open-label extension study of drisapersen for the treatment of DMD presented at the American Academy of Neurology (AAN)
Leiden, The Netherlands, May 1, 2014 (GLOBE NEWSWIRE) — Prosensa Holding N.V. (NASDAQ: RNA) the Dutch biopharmaceutical company focusing on rare diseases with a high unmet medical need, yesterday provided the data analysis of its second open-label extension study (DEMAND IV/DMD114349) of drisapersen in boys with Duchenne Muscular Dystrophy (DMD) during the 66th American Academy of Neurology (AAN) Annual Meeting in Philadelphia, PA. The Company also provided an update on the drisapersen clinical program earlier this week in a letter sent to patient group representatives and clinical investigators and will present a corporate update during an investor briefing on May 1.
Following positive feedback from patients and investigators regarding the willingness and desire of patients to go back on drisapersen and encouraging analyses of its clinical trial data, Prosensa has confirmed that it will re-dose an initial cohort of boys in the third quarter of 2014. The Company has made significant progress in the transition of the program from its former partner, GSK, and expects to communicate on a regulatory path forward for drisapersen before the end of June.
In a poster and presentation on Wednesday, April 30 at the AAN, Dr. Nathalie Goemans, Head of the Neuromuscular Reference Center for Children at the University Hospitals Leuven (UHL) in Belgium and one of the key investigators in various drisapersen studies confirmed the earlier preliminary analysis of the results of DEMAND IV/DMD114349, which include data from 96 weeks of continuous drisapersen treatment.
“We see very positive signs of the ability of drisapersen to improve the walking ability of boys with DMD. In this extension study, patients who entered the study with a less advanced stage of the disease either improved or experienced less decline in mobility with two-year continuous drisapersen therapy, and these data suggest a treatment difference from those initially on placebo,” reported Dr. Goemans.
The poster (online here) included detailed data up to Week 48 (total of 96 weeks of treatment) from the second open-label extension study of drisapersen in 113 boys with DMD (DEMAND IV), who had previously completed a 48-week, double-blind, placebo-controlled treatment phase in one of two feeder studies (DEMAND II/DMD114117 and DEMAND III/DMD114044). In the six minute walk test (6MWT), boys from the DEMAND II study declined by only 5 meters over 96 weeks on continuous drisapersen (6mg/kg/week) compared with 57 meters in boys who had placebo/delayed treatment. Furthermore, boys of 7 years or younger in DEMAND IV improved from their baseline 6MWT by 8 meters with continuous drisapersen treatment compared with a 29 meter decline for patients in the placebo/delayed treatment arm. The extension study was designed to monitor the long-term safety and efficacy of drisapersen over the course of two years at more than 50 sites in 24 countries.
“These data support our hypothesis that treating earlier in the disease and treating for a longer duration confers a treatment benefit for boys with DMD. Early intervention is a potentially crucial component to improving disease outcome,” said Dr. Giles Campion, Chief Medical Officer of Prosensa.
In a letter to all participating investigators and patient groups sent earlier this week, Prosensa confirmed it is on track with its re-dosing plans, which will take a staged approach. Dr. Nathalie Goemans (UHL, Belgium) and Dr. Craig McDonald (UC Davis, Sacramento, USA), who will be participating at an investor briefing on May 1, will be amongst investigators working with Prosensa to undertake re-dosing protocols with drisapersen. The first wave of re-dosing in the third quarter will focus on sites in North America and Europe. Patients in North America will be re-dosed under existing extension protocols and patients in Europe will either participate in a new treatment protocol or via an appropriate expanded access program. “We realize that this has been an incredibly difficult period for the boys and their families as they eagerly await any updates. We are working with all key stakeholders as diligently and quickly as possible to provide access to drisapersen and to determine a path forward” confirmed Dr. Campion.
“Prosensa is dedicated to enabling long term patient access to drisapersen and its follow-on products as novel treatments for DMD. We are determined to accomplish this as soon as possible, as we know time is not on patients’ side” said Hans Schikan, Prosensa’s Chief Executive Officer. “We have been following the recent communication in the DMD community and are encouraged by the apparent regulatory flexibility and positivity shown with respect to potential pathways for investigational products for the treatment of DMD, especially given the very urgent and unmet medical need of boys with this debilitating and life-shortening disease. We are heartened by the FDA’s commitment to DMD and its willingness to work closely with all key stakeholders, and to consider amenable approaches to expedite the availability of treatment options for DMD.”