- As in the CHAMPS study [1] patients must have had a first isolated, well-defined neurologic event consistent with demyelination and involving the optic nerve (unilateral optic neuritis), spinal cord (incomplete transverse myelitis), or brain stem or cerebellum (brain stem or cerebella syndrome). They must also have two or more clinically silent lesions of the brain that were at least 3 mm in diameter on MRI scans and were characteristic of MS (at least one lesion must be periventricular or ovoid).