Tumefactive multiple sclerosis in association with fingolimod initiation and discontinuation

Abstract

Background: Tumefactive multiple sclerosis (TMS) is a rare multiple sclerosis (MS) form that usually manifests as the initial presentation or in the early stages of MS. Objective: The aim of this study is to evaluate reports of TMS associated with fingolimod use. Methods: The Food and Drug Administration (FDA) Adverse Event Reporting System (FAERS) database and the medical literature were searched for cases of TMS occurring during or after fingolimod treatment. Results: We identified 29 TMS cases, 19 following fingolimod initiation and 10 following fingolimod discontinuation. In these cases, a TMS diagnosis occurred at a median of 7 years after MS diagnosis, and a median of 7 and 3 months following initiation and discontinuation of fingolimod, respectively. Twenty-two cases were assessed as possible and seven as probable from a causal association perspective. A much larger crude number of TMS reports was observed for fingolimod compared to other disease-modifying therapies. Conclusion: TMS should be considered when a severe or atypical MS relapse occurs shortly after fingolimod initiation or discontinuation, and should prompt imaging evaluation and appropriate treatment initiation. Prescribers’ awareness of the association between TMS and fingolimod may avoid unnecessary diagnostic procedures. In light of our findings, fingolimod (Gilenya) prescribing information was amended to include TMS in the Warnings and Precautions section.