Trial Outcomes & Findings for Safety and Efficacy Extension Study of Daclizumab High Yield Process (DAC HYP) in Participants With Multiple Sclerosis Who Have Completed Study 205MS201 (NCT00390221) to Treat Relapsing-Remitting Multiple Sclerosis (NCT NCT00870740)

Safety and Efficacy Extension Study of Daclizumab High Yield Process (DAC HYP) in Participants With Multiple Sclerosis Who Have Completed Study 205MS201 (NCT00390221) to Treat Relapsing-Remitting Multiple Sclerosis

Treatment-emergent AE: any untoward medical occurrence after the first dose of study treatment that did not necessarily have a causal relationship with this treatment. Serious AE (SAE): any untoward medical occurrence that at any dose: resulted in death; in the view of the Investigator, placed the subject at immediate risk of death (a life-threatening event); required inpatient hospitalization or prolongation of existing hospitalization; resulted in persistent or significant disability/incapacity; resulted in a congenital anomaly/birth defect. An SAE could also have been a medically significant event that, in the opinion of the Investigator, jeopardized the subject or required intervention to prevent one of the other outcomes listed in the definition above.

For participants who took DAC HYP during 205MS201 (NCT00390221) the baseline is defined as the baseline from 205MS201, and for participants who took placebo during 205MS201 the baseline is defined as the baseline from 205MS202 (NCT00870740). All post-baseline data are taken after first dose in 205MS202 only. SBP=systolic blood pressure; DBP=diastolic blood pressure; bpm=beats per minute; ↑ BL=increase from baseline; ↓ BL=decrease from baseline.

Hematology parameters evaluated include: white blood cells, lymphocytes, neutrophils, red blood cells (RBC), hemoglobin, and platelets.

For each abnormality a subject can be counted once. If a subject has more than one occurrence of the same abnormality the highest toxicity grade is counted. ALT=alanine aminotransferase; AST=aspartate aminotransferase; ALP=alkaline phosphatase; GGT=gamma-glutamyl transferase; TSH=thyroid stimulating hormone, ULN=upper limit of normal.

Number of participants positive and negative for ADAb and NAb, based on all post-baseline immunogenicity assessments during treatment period and follow-up. Participants are stratified differently in this Outcome Measure as per the pre-specified statistical analysis plan.

Relapses are defined as new or recurrent neurological symptoms not associated with fever or infection, lasting at least 24 hours, and accompanied by new objective neurological findings upon examination by the Independent Neurology Evaluation Committee (INEC). Relapse rate is calculated as: (Total number of relapses that occurred during the 205MS202 \[NCT00870740\] treatment phase divided by the total number of days followed in the treatment phase for 205MS202), multiplied by 365 days. Participants who received an alternative multiple sclerosis (MS) medication during 205MS201 (NCT00390221; Year 1) are not included in the summary of relapses and relapse rate for this study (Year 2). Participants are stratified differently in this Outcome Measure as per the pre-specified statistical analysis plan.

Relapses are defined as new or recurrent neurologic symptoms not associated with fever or infection, lasting at least 24 hours, and accompanied by new objective neurological findings upon examination by the INEC. Estimated using Kaplan-Meier analysis where time to first relapse is calculated from date of first dose in the study to date of first confirmed relapse. Participants who received an alternative MS medication before the first relapse were censored at the time of taking the alternative MS medication.

Evaluated by magnetic resonance imaging (MRI) by a central reader. Number of new Gd lesions since the previous scan (the previous scan for Week 20 was Week 52 of study 205MS201 \[NCT00390221\]). The number of Gd lesions may be imputed using last observation carried forward or using the mean value across all subjects within the treatment group. Baseline visits are not imputed. Participants are stratified differently in this Outcome Measure as per the pre-specified statistical analysis plan.

Lesions detected on T2-weighted sequences represent a range of histopathology related to MS, including edema, inflammation, demyelination, gliosis, and axon loss. Evaluated by MRI by a central reader. New or newly enlarging T2 lesions since baseline of study 205MS202 (NCT00870740). For post-baseline visits, the number of T2 lesions may be imputed using the mean value across all participants within the treatment group, if the participant has non-missing baseline data. Baseline visits are not imputed. Participants are stratified differently in this Outcome Measure as per the pre-specified statistical analysis plan.

T1-weighted scans detect areas of hypointensity that represent a greater degree of tissue destruction and axon loss than T2 hyperintense lesions and are more highly correlated with clinical disability measures and neurological deficit. Evaluated by MRI by a central reader. Baseline is volume of new T1 hypointense lesions since baseline in study 205MS201 (NCT00390221). Scans at Week 20 and Week 52 in 205MS202 are relative to baseline in 205MS202 (NCT00870740). For post-baseline visits, the total volume of T1 lesions may be imputed using the mean value across all subjects within the treatment group. Baseline visits are not imputed.

Lesions detected on T2-weighted sequences represent a range of histopathology related to MS, including edema, inflammation, demyelination, gliosis, and axon loss. Evaluated by MRI by a central reader. Baseline values = baseline for study 205MS202 (NCT00870740). For post-baseline visits, the total volume of T2 lesions may be imputed using the mean value across all subjects within the treatment group. Baseline visits are not imputed.

T1-weighted scans detect areas of hypointensity that represent a greater degree of tissue destruction and axon loss than T2 hyperintense lesions and are more highly correlated with clinical disability measures and neurological deficit. Evaluated by MRI by a central reader. Baseline values = baseline for study 205MS202 (NCT00870740). For post-baseline visits, the total volume of T1 lesions may be imputed using the mean value across all participants within the treatment group. Baseline visits are not imputed.

Total brain volume was measured by MRI and analyzed by a central reader. Rate of percentage change from baseline calculated using an analysis of covariance adjusting for baseline normalized brain volume. Baseline values = baseline for study 205MS202 (NCT00870740). Missing values post-baseline were imputed using the average value across subjects in the treatment group.