Cross-sectional and longitudinal monitoring of pRNFL is useful as a biomarker for prediction of physical and cognitive disability progression in patients with RRMS in everyday clinical practice.

BackgroundThe European Friedreich's Ataxia Consortium for Translational Studies (EFACTS) is a prospective international registry investigating the natural history of Friedreich ataxia (FRDA). Based on our 1 year and 2 year data we aimed to delineate potential outcomes for clinical trials. MethodsWe enrolled patients with genetically confirmed FRDA from 11 European study sites. Patients were seen on an yearly basis at three visits. Our primary endpoint was the Scale for the Assessment and Rating of Ataxia (SARA). Secondary outcomes were the Inventory of Non-Ataxia Signs (INAS), the Spinocerebellar Ataxia Functional Index (SCAFI), phonemic verbal fluency (PVF), and the quality of life measures activities of daily living (ADL) and EQ-5D-3L index. Disease progression was analysed with linear mixed effect models.This study is registered with ClinicalTrials.gov, number NCT02069509. Findings 605 FRDA patients were enrolled between 15-Sep-2010 and 21-Nov-2013. 546 patients (90%) contributed data with at least one follow-up visit. Annual progression rate for SARA was 0•77 points (SE 0•06) in the overall cohort. Deterioration in SARA was associated with a lower age of onset (by -0•02 [0•01] points per year) and a lower SARA baseline score (-0•07 [0•01] per baseline-point). Patients with more than 353 GAA repeats on the shorter allele had a higher SARA progression rate (by 0•09 [0•02] per additional 100 repeats).Annual worsening for INAS was 0•10 (0•03), for SCAFI -0•04 (0•01), for ADL 0•93 (0•06) and for EQ-5D-3L -0•02 (0•004). PVF performance improved by 0•99 [0•14] words per year. 548 or 184 patients would be needed to detect a 50% reduction in SARA progression at 80% power in a one-year or two-year clinical trial, respectively. InterpretationThe EFACTS longitudinal analysis provides suitable outcome measures and sample size calculation for upcoming clinical trial designs in FRDA.

Olfactory function changes over time in MS. Threshold impairment is transient and predicts inflammatory disease activity, while odor identification and discrimination are associated with disability progression. Olfactory dysfunction might be a useful and easily obtainable parameter to monitor patients with regard to inflammation and neurodegeneration in MS.