NEFL and myeloid sarcoma: Here, we aimed to further explore this association.<h4>Methods</h4>Bio-banked blood samples collected before the onset of MS from 981 cases and 1278 matched controls were analysed for antibodies against RV envelope proteins 1 and 2 (E2), and serum-neurofilament light chain (S-NfL), a marker for axonal injury.