Long-term follow-up of patients with multiple sclerosis over age 60: Comparing clinical and radiological outcomes in disease-modifying therapy continuers and discontinuers.

Background: Relapse prevention in multiple sclerosis (MS) is accomplished with disease-modifying therapy (DMT). Relapse rates typically decrease with age while DMT-associated risks increase, complicating treatment of older persons with MS (PwMS). Objectives: This follow-up study aims to guide treatment decisions by evaluating clinical and patient-reported outcomes among older PwMS who discontinue DMT. Methods: This study included PwMS aged ≥60 evaluated at the Cleveland Clinic from 2010 to 2016, categorized as DMT continuers or discontinuers. Follow-up timeframe was February 2018-April 2024. Outcomes included relapses, magnetic resonance imaging (MRI) activity, and Neuro-QoL and MS Performance Test scores. Mixed-effects regression and survival models were used. Results: In total, 600 PwMS were included. Median follow-up time was 10.5 years (interquartile range 7.7-13.4), 66.0% discontinued DMT, and 3.3% had ≥1 relapse. Relapse risk did not differ significantly between groups (hazard ratio for discontinuers vs. continuers, 1.80, 95% confidence interval 0.51-6.39, Conclusion: Findings demonstrate low relapse risk among PwMS over age 60, however, MRI changes were common. DMT discontinuation may be considered in this population, though further studies are needed to better understand radiological disease activity.