The goal of this clinical trial is to evaluate the efficacy and safety] in [subjects diagnosed with RMS according to the 2017 McDonald criteria, including clinically isolated syndrome (CIS), relapsing-remitting multiple sclerosis (RRMS), and active secondary progressive multiple sclerosis (SPMS).

The main questions it aims to answer are:

[Question 1] The efficacy of dimethyl fumarate enteric-coated capsules in the treatment of RMS.

[Question 2] The safety of dimethyl fumarate enteric-coated capsules in the treatment of RMS.

Participants will:

Eligible 50 RMS patients will orally take dimethyl fumarate enteric-coated capsules during treatment, with an initial dose of 120 mg twice daily for 7 days, followed by a maintenance dose of 240 mg twice daily for 48 weeks.

The annualized relapse rate (ARR) at Week 48 will be observed.](streamdown:incomplete-link)

Inclusion Criteria:

• Confirmed RMS per the 2017 McDonald criteria, including clinically isolated syndrome (CIS), relapsing-remitting MS (RRMS), or active secondary progressive MS (SPMS)
• At least one documented relapse within 12 months prior to screening; plus evidence of MS-consistent lesions on prior brain MRI or gadolinium-enhancing (GdE) lesions on an MRI performed within 6 weeks before screening
• Expanded Disability Status Scale (EDSS) score between 0.0 and 5.0 (inclusive) at screening

Exclusion Criteria:

• History or current diagnosis of malignancy (except fully resected basal cell carcinoma), or uncontrolled severe diseases of major organ systems (e.g., cardiac, renal, hepatic, neurological [excluding multiple sclerosis]) that, in the investigator's assessment, pose a significant risk to the subject or could confound study results.
• Protocol-defined multiple sclerosis (MS) relapse within 30 days prior to screening, or failure to achieve clinical stability from a prior relapse.
• History of suicidal behavior within 5 years prior to screening. Suicidal ideation (indicated by a "Yes" response to Item 4 or 5 on the C-SSRS) within 6 months prior to screening.Subjects with a history of suicidal behavior occurring >5 years prior to screening require investigator assessment of eligibility.