Safety, Tolerability, Pharmacokinetics and Pharmacodynamics of PF-06649751 in Parkinson's Disease
Safety, Tolerability, Pharmacokinetics and Pharmacodynamics of PF-06649751 in Parkinson's Disease
This study will be an open label, dose escalation study to investigate the safety,
 tolerability, pharmacokinetics and pharmacodynamics of repeated daily quaque die (QD) doses
 given over 21 days (Day 3 to Day 23) to sequential cohorts of subjects with Parkinson's
 disease. Each cohort will have 2 study periods. For each cohort, subjects will enter Period 1
 and if they meet criteria, approximately 12 subjects will be enrolled into Period 2 and dosed
 with PF 06649751. Based on results observed in a previous study, Cohorts 1 and 2 will not be
 conducted. Cohorts 3 - 6 will test doses uptitrated to 5 mg, 15 mg and 25 mg QD. Doses may be
 modified based on emerging safety, tolerability and PK data, but the maximum daily dose that
 will be given in any cohort will have PK predictions at steady state that are anticipated to
 be below toxicokinetic limits. An option for down titration to the previous dose level is
 available should the investigator consider that an AE is intolerable. Following down
 titration, a single up titration to the next dose level may be attempted if the subject
 remains symptom free for at least 48 hrs. Safety, tolerability and PK data of Cohort 3 will
 be reviewed prior to initiating the dosing in Cohorts 4 and 5. Available safety, tolerability
 and PK data up to Day 24 of at least 5 subjects from Cohorts 4 will be reviewed prior to
 initiating the dosing in Cohort 6.
Inclusion Criteria:

 -  Clinical diagnosis of idiopathic Parkinson's Disease with at least 2 out of 3 cardinal
 characteristics (tremor, rigidity, bradykinesia)

 -  Mini-Mental State Examination (MMSE) ≥ 25

 -  Hoehn & Yahr Stage I-III inclusive

 -  Documented history of end of L-Dopa wearing OFF

 -  Cohort 5 only: History of dyskinesia following L-Dopa dosing and Score of at least 2
 on Part IV, item 4.2 (functional impact of dyskinesia) of the MDS-UPDRS

 Exclusion Criteria:

 -  Atypical/secondary parkinsonism

 -  History of surgical intervention for Parkinson's Disease

 -  Dementia/cognitive impairment that can interfere with study assessments