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Treatment of optic neuritis with erythropoietin (TONE): a randomised, double-blind, placebo-controlled trialstudy protocol
ISSN
2044-6055
Date Issued
2016
Author(s)
Molnar, Fanni
Beisse, Flemming
Gross, Nikolai
Drueschler, Katharina
Heinrich, Sven P.
Joachimsen, Lutz
Rauer, Sebastian
Pielen, Amelie
Suehs, Kurt-Wolfram
Huchzermeyer, Cord
Albrecht, Philipp
Hassenstein, Andrea
Aktas, Orhan
Guthoff, Tanja
Tonagel, Felix
Kernstock, Christoph
Hartmann, Kathrin
Kuempfel, Tania
Hein, Katharina
Grotejohann, Birgit
Ihorst, Gabriele
Maurer, Julia
Mueller, Matthias
Volkmann, Martin
Wildemann, Brigitte
Platten, Michael
Wick, Wolfgang
Heesen, Christoph
Schiefer, Ulrich
Wolf, Sebastian
Lagreze, Wolf A.
DOI
10.1136/bmjopen-2015-010956
Abstract
Introduction Optic neuritis leads to degeneration of retinal ganglion cells whose axons form the optic nerve. The standard treatment is a methylprednisolone pulse therapy. This treatment slightly shortens the time of recovery but does not prevent neurodegeneration and persistent visual impairment. In a phase II trial performed in preparation of this study, we have shown that erythropoietin protects global retinal nerve fibre layer thickness (RNFLT-G) in acute optic neuritis; however, the preparatory trial was not powered to show effects on visual function. Methods and analysis Treatment of Optic Neuritis with Erythropoietin (TONE) is a national, randomised, double-blind, placebo-controlled, multicentre trial with two parallel arms. The primary objective is to determine the efficacy of erythropoietin compared to placebo given add-on to methylprednisolone as assessed by measurements of RNFLT-G and low-contrast visual acuity in the affected eye 6months after randomisation. Inclusion criteria are a first episode of optic neuritis with decreased visual acuity to 0.5 (decimal system) and an onset of symptoms within 10days prior to inclusion. The most important exclusion criteria are history of optic neuritis or multiple sclerosis or any ocular disease (affected or non-affected eye), significant hyperopia, myopia or astigmatism, elevated blood pressure, thrombotic events or malignancy. After randomisation, patients either receive 33000 international units human recombinant erythropoietin intravenously for 3 consecutive days or placebo (0.9% saline) administered intravenously. With an estimated power of 80%, the calculated sample size is 100 patients. The trial started in September 2014 with a planned recruitment period of 30months. Ethics and dissemination TONE has been approved by the Central Ethics Commission in Freiburg (194/14) and the German Federal Institute for Drugs and Medical Devices (61-3910-4039831). It complies with the Declaration of Helsinki, local laws and ICH-GCP. Trial registration number NCT01962571.
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