Research Study

An Open Label Extension Study To Investigate The Long Term Safety, Tolerability And Efficacy Of Pf-02545920 In Subjects With Huntington's Disease Who Previously Completed Study A8241021
Principal Investigator 
Lynn A. Raymond


Body Locations and Systems 
Huntington's Disease
Disorders and Conditions 
Huntington's Disease 
Closed to Recruitment
Study Start/End 
Apr 4, 2016 to Apr 1, 2017
UBC Hospital
Allison Coleman, Research Coordinator
Email Address
Purpose of Study 

This study is a 12 month open label extension study of PF-02545920 20 mg dosed BID following study A8241021 in subjects with HD. Primary endpoints will be to assess long-term safety and tolerability of 20 mg BID of PF-02545920. Secondary endpoints will be the change from baseline in the Total Motor Score (TMS)assessment, and/ior the Total maximum Chorea (TMC) assessment of the Unified Huntington Disease Rating Scale (UHDRS) after 6 and 12 months of treatment, and Clinical Global Impression-Improvement score after 6 and 12 months of treatment. Subjects, who were assigned to the 20 mg PF-02545920 dose group in the preceding A8241021 study, will receive 20 mg PF-02545920 without any titration. All other subjects will be titrated to the 20 mg BID dose as follows: 5 mg BID for 7 days, 10 mg BID for 7 days, 15 mg BID for 7 days, then 20 mg BID for the remainder of the treatment phase. Up to 260 subjects may take part in this open label extension


Visit for more information.


Study Coordinators and Research Nurses cannot give medical advice over the phone. Telephone numbers and email addresses are provided for obtaining additional information on specific clinical research trials only. If you have specific questions which require clinical expertise, please call your primary care physician.