Details

Autor(en) / Beteiligte

• Stocchi, Fabrizio
• Rascol, Olivier
• Hauser, Robert A
• Huyck, Susan
• Tzontcheva, Anjela
• Capece, Rachel
• Ho, Tony W
• Sklar, Peter
• Lines, Christopher
• Michelson, David
• Hewitt, David J

Titel

Randomized trial of preladenant, given as monotherapy, in patients with early Parkinson disease

Ist Teil von

• Neurology, 2017-06, Vol.88 (23), p.2198-2206

Ort / Verlag

United States

Erscheinungsjahr

2017

Quelle

MEDLINE

Beschreibungen/Notizen

• To evaluate the adenosine 2a receptor antagonist preladenant as a nondopaminergic drug for the treatment of Parkinson disease (PD) when given as monotherapy. This was a randomized, 26-week, placebo- and active-controlled, parallel-group, multicenter, double-blind trial conducted in adults diagnosed with PD for <5 years who were not yet receiving l-dopa or dopamine agonists. Patients with a Unified Parkinson's Disease Rating Scale (UPDRS) part 3 (motor function) score ≥10 and Hoehn & Yahr score ≤3 were randomized 1:1:1:1:1 to preladenant 2, 5, or 10 mg twice daily, rasagiline 1 mg (active-control) once daily, or placebo. The primary endpoint was the change from baseline at week 26 in the sum of UPDRS parts 2 (activities of daily living) and 3 scores (UPDRS ). The number of patients treated was 1,007. Neither preladenant nor rasagiline was superior to placebo after 26 weeks. The differences vs placebo (95% confidence interval) in UPDRS scores (with a negative difference indicating improvement vs placebo) were preladenant 2 mg = 2.60 (0.86, 4.30), preladenant 5 mg = 1.30 (-0.41, 2.94), preladenant 10 mg = 0.40 (-1.29, 2.11), and rasagiline 1 mg = 0.30 (-1.35, 2.03). Post hoc analyses did not identify a single causal factor that could explain the finding of a failed trial. Preladenant was generally well-tolerated with few patients discontinuing due to adverse events (preladenant 7%, rasagiline 3%, placebo 4%). No evidence supporting the efficacy of preladenant as monotherapy was observed in this phase 3 trial. The lack of efficacy of the active control rasagiline makes it difficult to interpret the results. Clinicaltrials.gov: NCT01155479. This study provides Class I evidence that for patients with early PD, preladenant is not effective as monotherapy at the doses studied (2, 5, 10 mg).