Primary varicella zoster infection associated with fingolimod treatment

Abstract

The therapy of relapsing-remitting multiple sclerosis (MS) has been revolutionized since the appearance of first-line disease-modifying drugs such as interferon-β and glatiramer acetate. These drugs are associated with moderate efficacy but no life-threatening risks. In contrast, new treatments, which have recently entered the MS scene, have been reported to display a superior efficacy with respect to relapse rate and progression of disability but also an unexpected risk of fatal adverse events.1,2 The oral drug sphingosine-1-phosphate-receptor modulator, fingolimod (FTY720), has been recently shown to have superior efficacy vs IM interferon-β 1a on clinical and MRI outcomes (TRANSFORMS study).3 However, 2 fatal viral infections occurred in patients who received fingolimod, including one case of primary varicella zoster (VZ). Recently, other adverse effects have been reported, mainly affecting the vascular system, such as a case of hemorrhagic focal …