Outcomes of immunosuppressive therapy discontinuation in patients with myelin oligodendrocyte glycoprotein antibody-associated disease

Background: Research on the optimal duration of immunosuppressive therapy (IST) and the outcome upon its discontinuation in myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD) remains limited. Objective: To evaluate the outcomes following IST discontinuation in MOGAD. Methods: This multicenter retrospective study collected data from 333 MOGAD patients in Korea. Among 273 patients who received IST, 41 who discontinued IST were analyzed. Results: The median age at disease onset was 38.3 years (interquartile range (IQR), 27.6–53.1). Before IST withdrawal, 21 (51%) patients exhibited relapsing courses. Over a median follow-up of 23.5 months (IQR, 12.1–39.5) after discontinuation, 10 patients (24.4%) relapsed after a median of 8.2 months (IQR, 6.3–11.5). All relapses occurred in patients with a prior relapsing course (10/21, 47.6%); none with prior monophasic courses relapsed. Among 21 prior relapsing patients, relapse after discontinuation group had a shorter IST duration than non-relapse group (median, 9.4 vs 50.9 months, p = 0.036). None of the 41 patients had severe disability (Expanded Disability Status Scale (EDSS) score ⩾ 4.0 or Visual Functional System score ⩾ 5) at the last visit. Conclusion: IST discontinuation did not necessarily lead to relapse and could be considered with an individualized approach based on factors such as disease course and IST duration.