The current study aims to comprehensively investigate the individual clinical, morphological and biochemical aspects of MS in order to elucidate underlying mechanisms leading to disease progression. This shall ultimately serve to identify imaging and biochemical markers, which may support clinical management of persons with MS (pwMS). The following markers will be assessed: demographics (age, sex), clinical (EDSS at baseline, disease duration); neuropsychological (SDMT (Symbol Digit Modalities Test) score); MRI (Magnetic Resonance Imaging) (lesion load, atrophy); Biochemical markers analyzed in cerebrospinal fluid (CSF), blood, DNA, RNA, peripheral blood mononuclear cells (PBMCs)