This clinical trial is focused on studying the effects of a treatment for secondary progressive multiple sclerosis (SPMS), a type of multiple sclerosis where the disease gradually worsens over time. The treatment being tested is a medication called siponimod, which is available in the form of film-coated tablets known as Mayzent. The study aims to explore how this medication affects chronic inflammation in the brain and spinal cord, which is a key feature of SPMS.
Participants in the study will take siponimod and be monitored over a period of two years. During this time, researchers will collect and analyze samples of blood and cerebrospinal fluid (CSF), the fluid surrounding the brain and spinal cord, to understand how the medication impacts inflammation. The study will also involve regular assessments of participants’ neurological health, including the use of MRI scans to track changes in the brain and spinal cord.
Throughout the study, researchers will evaluate various health markers, including those related to inflammation and nerve damage, as well as changes in cognitive function and physical abilities. The goal is to determine the effectiveness of siponimod in managing SPMS and to gather information on any side effects that may occur during the treatment period. Participants will also be compared to a control group receiving a placebo to assess the true impact of the medication.



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