Conditions: Huntington's Disease
Keywords: Huntington; chorea; total motor score; CAG repeat: total functional capacity; motor cognitive and behavioral symptoms
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 272
Healthy volunteers: no

Brief summary:
This study is a 26 week, randomized, parallel group, double blind comparison of PF-02545920 5 mg, PF-02545920 20 mg, and placebo dosed BID in the treatment of motor impairment of subjects with Huntington's Disease. A total of approximately 260 subjects are planned to be randomized in the study. Primary endpoint is the change from baseline in the Total Motor Score (TMS) assessment of the Unified Huntington Disease Rating Scale (UHDRS) after 26 weeks of treatment. secondary endpoints will include change from baseline in the Total Maximum Chorea (TMC) score of the UHDRS after 13 and 26 weeks of treatment and Clinical Global Impression-Improvement score after 13 and 26 weeks of treatment.

Detailed description:

Arms:
arm 1: 20 mg PF-02545920 BID arm 2: 5 mg PF-02545920 BID arm 3: Matching placebo

Interventions: intervention 1: PF-02545920 intervention 2: PF-02545920 intervention 3: Placebo
Intervention descriptions: intervention 1: 20 mg twice a day (BID) for 26 weeks. Each 20 mg dose will be taken as 4 tablets of 5 mg. The 20mg dose will be titrated as follow: 5mg BID for 7 days, 10mg BID for 7 days, 15 mg BID for 7 days and 20 mg BID to week 26. Study drug will be provided in weekly blister cards. intervention 2: 5 mg twice a day (BID) for 26 weeks. Each 5 mg dose will be taken as 4 tablets: one tablet of 5 mg and 3 tablets of matching placebo. The 5mg dose will not be titrated. Study drug will be provided in weekly blister cards. intervention 3: Matching Placebo twice a day (BID) for 26 weeks. Each placebo dose will be taken as 4 tablets of matching Placebo. The placebo dose will not be titrated. Matching placebo will be provided in weekly blister cards.

Protocol document: