Discontinuation of first-line disease-modifying therapy in relapse onset multiple sclerosis.

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It is not known if and when first-line disease modifying therapy (DMT) can safely be discontinued in relapse onset multiple sclerosis (MS) patients. To investigate the characteristics of patients who discontinued first-line DMT, and the occurrence of clinical and radiological inflammatory disease activity after discontinuation. We collected clinical and MRI parameters from patients with relapse onset MS in the MS Center Amsterdam and Rijnstate Hospital Arnhem who discontinued first-line DMT with no intention of restarting or switching treatment. In total, 130 patients were included in the analyses. After discontinuation, 78 patients (60%) experienced disease activity. Sixty-three patients (48.5%) showed MRI activity after DMT discontinuation, 40 patients (30.8%) experienced relapse(s), and 29 patients (22.3%) restarted DMT. Higher age at DMT discontinuation was associated with a lower risk of MRI activity (45 -55vs. <45 years: OR 0.301, p=0.007, >55vs. <45 years, OR: 0.296, p=0.044), and with a lower risk of relapse(s) after discontinuation (45-55vs. <45 years: OR=0.495, p=0.106, >55vs. <45 years: OR=0.081, p=0.020). Higher age at first-line DMT discontinuation is associated with lower risk and severity of radiological disease activity in MS, and a lower risk of relapse(s) after discontinuation.