After that, patients will be given 0.5mg/day oral fingolimod over a course of 3 consecutive days , then investigators will make a neurofunctional assessment before and 7days, 30 days and 90days after oral fingolimod. And Magnetic Resonance of the brain before, 7days, 14days and 90days after oral fingolimod. Furthermore 5ml intravenous blood for flow cytometry is also taken before and 1day,3days,7days after fingolimod use.