U-2522

TREATING RRMS OR SPMS WITH ORAL CLADRIBINE: (I) 2-4 MONTHS INDUCTION WITH 1.7 MG/KG - 3.5 MG/KG CLADRIBINE; (II) CLADRIBINE-FREE PERIOD OF ABOUT 8-10 MONTHS; (III) 2-4 MONTHS MAINTENANCE WITH ABOUT 1.7 MG/KG CLADRIBINE; (IV) CLADRIBINE-FREE PERIOD