A Pilot Study Assessing the Impact of Gilenya Therapy on Bone Density Change in Relapsing Forms of Multiple Sclerosis

To assess the effect of Gilenya on the rate of decline in bone mass density and expression of selected bone turnover biomarkers in ambulatory subject with a relapsing form of Multiple Sclerosis compared to control subjects matched for age, race, gender, duration of disease, and disability on an alternative FDA approved disease modifying therapy or no therapy at 24 months compared to baseline.