Study to evaluate Whether 6-Week Up-Titration in Tecfidera® Dose is Effective in Reducing the Incidence of Gastrointestinal Adverse Events in Patients with Multiple Sclerosis

INTERVENTION: Product Name: BG00012 Product Code: BG00012 Pharmaceutical Form: Gastro‐resistant capsule, hard INN or Proposed INN: DIMETHYL FUMARATE CAS Number: 624‐49‐7 Current Sponsor code: BG00012 Other descriptive name: DIMETHYL FUMARATE Concentration unit: mg milligram(s) Concentration type: equal Concentration number: 120‐ Pharmaceutical form of the placebo: Capsule, hard Route of administration of the placebo: Oral use CONDITION: Multiple Sclerosis ; MedDRA version: 17.1 Level: SOC Classification code 10029205 Term: Nervous system disorders System Organ Class: 10029205 ‐ Nervous system disorders ; MedDRA version: 17.1 Level: PT Classification code 10063399 Term: Relapsing‐remitting multiple sclerosis System Organ Class: 10029205 ‐ Nervous system disorders Therapeutic area: Diseases [C] ‐ Nervous System Diseases [C10] PRIMARY OUTCOME: Main Objective: The primary objective of the study is to assess whether a 6‐week titration (compared with a 1‐week titration) is effective in reducing the incidence of BG00012‐related GI AEs in subjects with MS. Primary end point(s): The primary endpoint is the proportion of subjects with a worsening in severity of GI AEs, defined as a positive average change from baseline to the end of BG00012 treatment in the Gastrointestinal Symptom Rating Scale (GSRS). Secondary Objective: The secondary objective of this study is to assess whether a 6‐week titration (compared with a 1‐week titration) is effective in reducing the average severity and duration of GI symptoms over 12 weeks of BG00012 treatment in this study population. Timepoint(s) of evaluation of this end point: Subjects will be required to record their GI symptoms in the eDiary every day from the baseline visit until the end of the 12‐week BG00012 treatment period (Week 14). Timepoint for evaluation of the change in GSRS score from baseline will be Week 14. SECONDARY OUTCOME: Secondary end point(s): The secondary endpoints are as follows: ; 1. Average change from baseline in GSRS scores over the 12 weeks of BG00012 treatment as measured by the total change in GSRS scores from baseline divided by the total number of days with GSRS scores recorded ; 2. Time to first worsening in GSRS score from baseline ; 3. Time to recovery to baseline score from the last occurrence of worst GSRS score ; 4. Average change from baseline in GSRS scores to the end of Weeks 4, 6, 8, 10, 12, and 14 Timepoint(s) of evaluation of this end point: Timepoint for evaluation of: ; 1. Timepoint for evaluation of the change in GSRS score from baseline will be Week 14. ; 2 and 3. will be evaluated as they occur. ; 4. Timepoint for evaluation will be Weeks 4, 6, 8, 10, 12, and 14 INCLUSION CRITERIA: To be eligible to participate in this study, candidates must meet the following eligibility criteria at the baseline visit: 1. Ability to understand the purpose and risks of the study and provide signed and dated informed consent and authorization to use protected health information (PHI) in accordance with national and local subject privacy regulations 2. Aged 18 to 65 years old, inclusive, at the time of informed consent 3. Diagnosis of MS consistent with locally labeled indication for BG00012 4. No prior treatment with BG00012 5. Female subjects of childbearing potential who are not surgically sterile must practice effective contraception (see Section 15.5.3) during their participation in the study 6. Have had a recent (i.e., at screening or within the previous 6 months) complete blood count (CBC), including lymphocyte count, that does not preclude the subject’s participation in the study, in the judgment of the Investigator Are the