“…An analysis of >1800 patients who stopped NTZ therapy showed that relapse of disease activity was particularly evident in patients who had had highly active disease before NTZ therapy 42. Similarly, there are some case reports of exacerbation after discontinuation of FTY 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56. Patients with highly active disease before the start of treatment with FTY51 or who showed a good therapeutic response to FTY53 might be predisposed to severe rebound after withdrawal.…”