Autologous, Bone Marrow-Derived Mesenchymal Stem Cell-Derived Neural Progenitor Cells (MSC-NP), Expanded Ex Vivo; Administered Intrathecally

• Diagnosis of MS as defined by the McDonald criteria

• Diagnosis of primary progressive or secondary progressive MS

• Patients will be 18 years or older

• Significant disability shown by an Expanded Disability Status Score (EDSS, \[5\]) ≥4.5 that was not acquired within the last 12 months \*(Patients with moderate to severe cerebellar dysfunction who have an EDSS of \<6.5 who are not eligible for our Ph II Version Date: 11/21/18 Version #4 9 study will be included. This is because EDSS scores are heavily related to muscle strength and not balance or coordination and most accurately reflect paraparesis. Also there are patients with MS who have disabling upper limb coordination dysfunction but EDSS scores of better than 6.5 who are not suitable for the Phase II study but may benefit from this therapy).

• Stable disease state as evidenced by a lack of gadolinium-enhancing lesions on an MRI and by a stable MRI disease burden (number of T2 lesions and size of lesions) in the last six months and no significant change in EDSS (1 point or more) in the last 12 months

• Does not qualify for the inclusion/exclusion criteria of our Phase II stem cell trial. For example, patients with EDSS \>6.5 or MS symptom onset and/or duration of disease \>15 years