This open-label positron emission tomography (PET) study is designed to determine the effect of ABT-555 on translocator protein expression level in participants with relapsing forms of multiple sclerosis.
Name: ABT-555
Description: Compare 2 dynamic positron emission tomography scans to examine the effect of a single administration of ABT-555 on translocator protein expression
Measure: Change in translocator protein expression Time: Day 0 and 109 daysAllocation: N/A
Single Group Assignment
There is one SNP
Inclusion Criteria: Diagnosis of relapsing-remitting MS (RRMS) or relapsing secondary progressive MS (SPMS) Neurologically stable at Screening, in the investigator's judgment and not actively experiencing or recovering from a recent relapse in the 30 days preceding the Screening Visit A Kurtzke Expanded Disability Status Scale (EDSS) score of 1.0 to 6.0, inclusive at the Screening Visit High or mixed affinity binder of the TSPO, as determined by rs6971 polymorphism genotyping at screening Exclusion Criteria: Diagnosis of primary progressive or non-relapsing secondary progressive MS Smoking more than 10 cigarettes per day or use of a nicotine patch Known history of, or positive screening test result for hepatitis C virus or hepatitis B virus Varicella or herpes zoster virus infection or any severe viral infection within 6 weeks before Screening Any type of live virus vaccine from 4 weeks before randomization History of abnormal laboratory results Inclusion Criteria: Diagnosis of relapsing-remitting MS (RRMS) or relapsing secondary progressive MS (SPMS) Neurologically stable at Screening, in the investigator's judgment and not actively experiencing or recovering from a recent relapse in the 30 days preceding the Screening Visit A Kurtzke Expanded Disability Status Scale (EDSS) score of 1.0 to 6.0, inclusive at the Screening Visit High or mixed affinity binder of the TSPO, as determined by rs6971 polymorphism genotyping at screening Exclusion Criteria: Diagnosis of primary progressive or non-relapsing secondary progressive MS Smoking more than 10 cigarettes per day or use of a nicotine patch Known history of, or positive screening test result for hepatitis C virus or hepatitis B virus Varicella or herpes zoster virus infection or any severe viral infection within 6 weeks before Screening Any type of live virus vaccine from 4 weeks before randomization History of abnormal laboratory results Multiple Sclerosis Multiple Sclerosis Sclerosis null