Please select the arm or intervention descriptions that belong to the clinical trial below.
Title: A Multicenter, Randomized, Double-Blind, Placebo-Controlled Study of the Efficacy of Natalizumab on Reducing Disability Progression in Subjects With Secondary Progressive Multiple Sclerosis, With Optional Open-Label Extension
Brief Summary: This is a Phase 3b, multicenter, international study conducted in 2 parts. Upon completion of the placebo-controlled period (Part 1), participants will have the option of enrolling in a 2-year open-label extension (Part 2).

Part 1: The primary objective of the study is to investigate whether treatment with natalizumab slows the accumulation of disability not related to relapses in participants with secondary progressive multiple sclerosis (SPMS).

The secondary objectives of Part 1 of this study are to determine the proportion of participants with consistent improvement in Timed 25-Foot Walk (T25FW), the change in participant-reported ambulatory status as measured by the 12-item MS Walking Scale (MSWS-12), the change in manual ability based on the ABILHAND Questionnaire, the impact of natalizumab on participant-reported quality of life using the Multiple Sclerosis Impact Scale-29 Physical (MSIS-29 Physical), the change in whole brain volume between the end of study and Week 24 using magnetic resonance imaging (MRI) and the proportion of participants experiencing progression of disability as measured by individual physical Expanded Disability Status Scale (EDSS) system scores.

Part 2: The primary objective of Part 2 of the study is to evaluate the safety profile of natalizumab in participants with SPMS.

The secondary objectives of Part 2 of the study are to investigate long-term disability (based on clinical or participant-reported assessments) in participants with SPMS receiving natalizumab treatment for approximately 4 years and to assess change in brain volume and T2 lesion volume.


Options:
A: Arm Label: natalizumab; Type: EXPERIMENTAL; Interventions: Drug: natalizumab | Arm Label: Placebo; Type: EXPERIMENTAL; Interventions: Drug: natalizumab, Drug: Placebo | Intervention Type: DRUG; Name: natalizumab; Assigned to Arm(s): Placebo, natalizumab | Intervention Type: DRUG; Name: Placebo; Assigned to Arm(s): Placebo
B: Arm Label: Interferon Beta-1a; Type: ACTIVE_COMPARATOR; Interventions: Biological: Interferon beta-1a | Arm Label: Alemtuzumab 12 mg; Type: EXPERIMENTAL; Interventions: Biological: Alemtuzumab 12 mg | Arm Label: Alemtuzumab 24 mg; Type: EXPERIMENTAL; Interventions: Biological: Alemtuzumab 24 mg | Intervention Type: BIOLOGICAL; Name: Interferon beta-1a; Assigned to Arm(s): Interferon Beta-1a | Intervention Type: BIOLOGICAL; Name: Alemtuzumab 12 mg; Assigned to Arm(s): Alemtuzumab 12 mg | Intervention Type: BIOLOGICAL; Name: Alemtuzumab 24 mg; Assigned to Arm(s): Alemtuzumab 24 mg
C: Arm Label: Threshold estimates; Type: EXPERIMENTAL; Interventions: Other: descriptive case-scenarios | Arm Label: Alternative threshold estimates; Type: ACTIVE_COMPARATOR; Interventions: Other: descriptive case-scenarios | Intervention Type: OTHER; Name: descriptive case-scenarios; Assigned to Arm(s): Alternative threshold estimates, Threshold estimates
D: Arm Label: Fingolimod (FTY720) 1.25 mg/day; Type: EXPERIMENTAL; Interventions: Drug: FTY720 | Arm Label: Placebo/Fingolimod (FTY720); Type: PLACEBO_COMPARATOR; Interventions: Drug: Placebo | Arm Label: Fingolimod (FTY720) 5.0 mg/day; Type: EXPERIMENTAL; Interventions: Drug: FTY720 | Intervention Type: DRUG; Name: FTY720; Assigned to Arm(s): Fingolimod (FTY720) 1.25 mg/day, Fingolimod (FTY720) 5.0 mg/day | Intervention Type: DRUG; Name: Placebo; Assigned to Arm(s): Placebo/Fingolimod (FTY720)

Answer: A