Therapeutic Advances in Neurological Disorders 2020
PF-06649751 efficacy and safety in early Parkinson's disease: a randomized, placebo-controlled trial.
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Results
Enrollment was terminated early for reasons unrelated to the trial. Overall, 57 subjects received study medication (PF-06649751 = 29; placebo = 28) and 47 completed the study (PF-06649751 = 25; placebo = 22). Despite early termination, the study met its primary endpoint with the PF-06649751 group showing statistically significant improvement from baseline in the Movement Disorder Society-Unified Parkinson's Disease Rating Scale (MDS-UPDRS) Part III score at week 15 compared with placebo. Mean (SE) change in MDS-UPDRS Part III score was -9.0 (1.54) for PF-06649751 and -4.3 (1.65) for placebo. This corresponds to an improvement versus placebo of 4.8 for the PF-06649751 group (two-sided p = 0.0407; 90% CI = 1.0, 8.6). Statistically significant improvement in MDS-UPDRS-III score was also observed at all assessment time points prior to week 15. The safety profile of PF-06649751 was similar to that observed in prior studies, with the majority of adverse events (AEs) reported as mild or moderate. The most common AEs in the PF-06649751 group were nausea, headache, dry mouth, somnolence, and tremor.